- 12 Jan, 2017 1 commit
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Arnd Bergmann authored
The failure path in the newly added function tries to free an uninitialized pointer: drivers/clk/clk-stm32f4.c: In function 'stm32f4_rcc_init': drivers/clk/clk-stm32f4.c:1106:4: error: 'gate' may be used uninitialized in this function [-Werror=maybe-uninitialized] I'm adding an initialization to NULL here to make the kfree() succeed, and I'm also rearranging the cleanup so that the same kfree() is used for any error path, making the function slightly more robust against newly introduced bugs in the error handling. Fixes: daf2d117 ("clk: stm32f4: Add lcd-tft clock") Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Acked-by:
Gabriel Fernandez <gabriel.fernandez@st.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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- 10 Jan, 2017 19 commits
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Stephen Boyd authored
* clk-fixes: clk/samsung: exynos542x: mark some clocks as critical
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Akinobu Mita authored
The CDCE925 is a member of the CDCE(L)9xx programmable clock generator family. There are also CDCE913, CDCE937, CDCE949 which have different number of PLLs and outputs. The clk-cdce925 driver supports only CDCE925 in the family. This adds support for the CDCE913, CDCE937, CDCE949, too. Signed-off-by:
Akinobu Mita <akinobu.mita@gmail.com> Acked-by:
Rob Herring <robh@kernel.org> Cc: Mike Looijmans <mike.looijmans@topic.nl> Cc: Michael Turquette <mturquette@linaro.org> Cc: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Zoran Markovic authored
Add definition of EBI2 clock used by MDM9615 NAND controller. Cc: Andy Gross <andy.gross@linaro.org> Cc: David Brown <david.brown@linaro.org> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: linux-arm-msm@vger.kernel.org Cc: linux-soc@vger.kernel.org Cc: linux-clk@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by:
Zoran Markovic <zmarkovic@sierrawireless.com> Acked-by:
Neil Armstrong <narmstrong@baylibre.com> [sboyd@codeaurora.org: ebi2_clk halt bit is 24 not 23] Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Masahiro Yamada authored
This include was needed to suppress build error when this driver was initially merged because <linux/regmap.h> did not include <linux/delay.h> at that time. (developers' headache across sub-systems) The root cause has been fixed by commit adf08d48 ("regmap: include <linux/delay.h> from include/linux/regmap.h"), so this line can be dropped now. Signed-off-by:
Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Thomas Petazzoni authored
This commit adjusts the list of possible "Sample At Reset" values that define the CPU clock frequency of the AP806 (part of Marvell Armada 7K/8K) to the values that have been validated with the production chip. Earlier values were preliminary. Signed-off-by:
Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Stephen Boyd authored
* clk-hi3660: clk: hisilicon: Add clock driver for hi3660 SoC dt-bindings: Document the hi3660 clock bindings
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Zhangfei Gao authored
Add clock drivers for hi3660 SoC, this driver controls the SoC registers to supply different clocks to different IPs in the SoC. Signed-off-by:
Zhangfei Gao <zhangfei.gao@linaro.org> [sboyd@codeaurora.org: Simplify probe with function pointer] Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Zhangfei Gao authored
Add DT bindings documentation for hi3660 SoC clock. Signed-off-by:
Zhangfei Gao <zhangfei.gao@linaro.org> Acked-by:
Rob Herring <robh@kernel.org> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Marek Szyprowski authored
Some parent clocks of the Exynos542x clock blocks, which have separate power domains (like DISP, MFC, MSC, GSC, FSYS and G2D) must be always enabled to access any register related to power management unit or devices connected to it. For the time being, until a proper solution based on runtime PM is applied, mark those clocks as critical (instead of ignore unused or even no flags) to prevent disabling them. Signed-off-by:
Marek Szyprowski <m.szyprowski@samsung.com> Acked-by:
Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by:
Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by:
Javier Martinez Canillas <javier@osg.samsung.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> [Exynos5800 Peach Pi Chromebook] Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Geert Uytterhoeven authored
EPROBE_DEFER is not an error, hence printing an error message like clk: couldn't get clock 0 for /soc/display@feb00000 may confuse the user. Suppress error messages in case of probe deferral to fix this. Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by:
Javier Martinez Canillas <javier@osg.samsung.com> Reviewed-by:
Marek Vasut <marek.vasut@gmail.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Sudeep Holla authored
Currently we add the virtual cpufreq device unconditionally even when the SCPI DVFS clock provider node is disabled. This will cause cpufreq driver to throw errors when it gets initailised on boot/modprobe and also when the CPUs are hot-plugged back in. This patch fixes the issue by adding the virtual cpufreq device only if the SCPI DVFS clock provider is available and registered. Fixes: 9490f01e ("clk: scpi: add support for cpufreq virtual device") Reported-by:
Michał Zegan <webczat_200@poczta.onet.pl> Cc: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by:
Sudeep Holla <sudeep.holla@arm.com> Tested-by:
Michał Zegan <webczat_200@poczta.onet.pl> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Avaneesh Kumar Dwivedi authored
Add support to use reset control framework for resetting MSS with hexagon v56 1.5.0. Signed-off-by:
Avaneesh Kumar Dwivedi <akdwived@codeaurora.org> Reviewed-by:
Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Jun Nie authored
The audio related clock support is missing from the existing zx296718 clock driver. Let's add it, so that the upstream ZX SPDIF driver can work for HDMI audio support. Signed-off-by:
Jun Nie <jun.nie@linaro.org> Signed-off-by:
Shawn Guo <shawn.guo@linaro.org> [sboyd@codeaurora.org: Staticize some more structures] Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Shawn Guo authored
It adds the compatible string for zx296718 audio clock controller. Signed-off-by:
Shawn Guo <shawn.guo@linaro.org> Acked-by:
Rob Herring <robh@kernel.org> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Shawn Guo authored
Instead of using panic, we should give an error message and return error code when of_clk_add_hw_provider() call fails. Since we have error prompt for failures, the "init over" pr_info output isn't really necessary but becomes a debug noise. So let's clean it up along the way. Signed-off-by:
Shawn Guo <shawn.guo@linaro.org> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Nicholas Mc Guire authored
The delay here is not in atomic context and does not seem critical with respect to precision, but usleep_range(min,max) with min==max results in giving the timer subsystem no room to optimize uncritical delays. Fix this by setting the range to 2000,3000 us. Fixes: commit f05259a6 ("clk: wm831x: Add initial WM831x clock driver") Signed-off-by:
Nicholas Mc Guire <hofrat@osadl.org> Acked-by:
Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Nikita Yushchenko authored
On vf610, PLL1 and PLL2 have registers to configure fractional part of frequency multiplier. This patch adds support for these registers. This fixes "fast system clock" issue on boards where bootloader sets fractional multiplier for PLL1. Suggested-by:
Andrey Smirnov <andrew.smirnov@gmail.com> CC: Chris Healy <cphealy@gmail.com> Signed-off-by:
Nikita Yushchenko <nikita.yoush@cogentembedded.com> Tested-by:
Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Jose Abreu authored
Init field must be cleared in driver probe as this structure is not dinamically allocated. If not, wrong flags can be passed to core. Signed-off-by:
Jose Abreu <joabreu@synopsys.com> Cc: Carlos Palminha <palminha@synopsys.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Michael Turquette <mturquette@baylibre.com> Cc: linux-clk@vger.kernel.org Cc: linux-kernel@vger.kernel.org Fixes: 923587aa ("clk/axs10x: Add I2S PLL clock driver") Signed-off-by:
Michael Turquette <mturquette@baylibre.com> Link: lkml.kernel.org/r/040cc9afdfa0e95ce7a01c406ff427ef7dc0c0fd.1481540717.git.joabreu@synopsys.com
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Stephen Boyd authored
* clk-qcom-rpm8974: clk: qcom: smd-rpmcc: Add msm8974 clocks * clk-stm32f4: clk: stm32f4: SDIO & 48Mhz clock management for STM32F469 board clk: stm32f4: Add SAI clocks clk: stm32f4: Add I2S clock clk: stm32f4: Add lcd-tft clock clk: stm32f4: Add post divisor for I2S & SAI PLLs clk: stm32f4: Add PLL_I2S & PLL_SAI for STM32F429/469 boards clk: stm32f4: Update DT bindings documentation * clk-ipq4019: clk: qcom: ipq4019: Add the cpu clock frequency change notifier clk: qcom: ipq4019: Add all the frequencies for apss cpu clk: qcom: ipq4019: correct sdcc frequency and parent name clk: qcom: ipq4019: Add the nodes for pcnoc clk: qcom: ipq4019: Add the apss cpu pll divider clock node clk: qcom: ipq4019: remove fixed clocks and add pll clocks * clk-fixes: clk: stm32f4: Use CLK_OF_DECLARE_DRIVER initialization method clk: renesas: mstp: Support 8-bit registers for r7s72100
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- 01 Jan, 2017 2 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimmLinus Torvalds authored
Pull DAX updates from Dan Williams: "The completion of Jan's DAX work for 4.10. As I mentioned in the libnvdimm-for-4.10 pull request, these are some final fixes for the DAX dirty-cacheline-tracking invalidation work that was merged through the -mm, ext4, and xfs trees in -rc1. These patches were prepared prior to the merge window, but we waited for 4.10-rc1 to have a stable merge base after all the prerequisites were merged. Quoting Jan on the overall changes in these patches: "So I'd like all these 6 patches to go for rc2. The first three patches fix invalidation of exceptional DAX entries (a bug which is there for a long time) - without these patches data loss can occur on power failure even though user called fsync(2). The other three patches change locking of DAX faults so that ->iomap_begin() is called in a more relaxed locking context and we are safe to start a transaction there for ext4" These have received a build success notification from the kbuild robot, and pass the latest libnvdimm unit tests. There have not been any -next releases since -rc1, so they have not appeared there" * 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: ext4: Simplify DAX fault path dax: Call ->iomap_begin without entry lock during dax fault dax: Finish fault completely when loading holes dax: Avoid page invalidation races and unnecessary radix tree traversals mm: Invalidate DAX radix tree entries only if appropriate ext2: Return BH_New buffers for zeroed blocks
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- 30 Dec, 2016 2 commits
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git://git.lwn.net/linuxLinus Torvalds authored
Pull documentation fixes from Jonathan Corbet: "Two small fixes: - A merge error on my part broke the DocBook build. I've requisitioned one of tglx's frozen sharks for appropriate disciplinary action and resolved to be more careful about testing the DocBook stuff as long as it's still around. - Fix an error in unaligned-memory-access.txt" * tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux: Documentation/unaligned-memory-access.txt: fix incorrect comparison operator docs: Fix build failure
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds authored
Pull crypto fix from Herbert Xu: "This fixes a boot failure on some platforms when crypto self test is enabled along with the new acomp interface" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: testmgr - Use heap buffer for acomp test input
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- 29 Dec, 2016 2 commits
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Olof Johansson authored
mm/filemap.c: In function 'clear_bit_unlock_is_negative_byte': mm/filemap.c:933:9: error: too few arguments to function 'test_bit' return test_bit(PG_waiters); ^~~~~~~~ Fixes: b91e1302 ('mm: optimize PageWaiters bit use for unlock_page()') Signed-off-by:
Olof Johansson <olof@lixom.net> Brown-paper-bag-by:
Linus Torvalds <dummy@duh.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Linus Torvalds authored
In commit 62906027 ("mm: add PageWaiters indicating tasks are waiting for a page bit") Nick Piggin made our page locking no longer unconditionally touch the hashed page waitqueue, which not only helps performance in general, but is particularly helpful on NUMA machines where the hashed wait queues can bounce around a lot. However, the "clear lock bit atomically and then test the waiters bit" sequence turns out to be much more expensive than it needs to be, because you get a nasty stall when trying to access the same word that just got updated atomically. On architectures where locking is done with LL/SC, this would be trivial to fix with a new primitive that clears one bit and tests another atomically, but that ends up not working on x86, where the only atomic operations that return the result end up being cmpxchg and xadd. The atomic bit operations return the old value of the same bit we changed, not the value of an unrelated bit. On x86, we could put the lock bit in the high bit of the byte, and use "xadd" with that bit (where the overflow ends up not touching other bits), and look at the other bits of the result. However, an even simpler model is to just use a regular atomic "and" to clear the lock bit, and then the sign bit in eflags will indicate the resulting state of the unrelated bit #7. So by moving the PageWaiters bit up to bit #7, we can atomically clear the lock bit and test the waiters bit on x86 too. And architectures with LL/SC (which is all the usual RISC suspects), the particular bit doesn't matter, so they are fine with this approach too. This avoids the extra access to the same atomic word, and thus avoids the costly stall at page unlock time. The only downside is that the interface ends up being a bit odd and specialized: clear a bit in a byte, and test the sign bit. Nick doesn't love the resulting name of the new primitive, but I'd rather make the name be descriptive and very clear about the limitation imposed by trying to work across all relevant architectures than make it be some generic thing that doesn't make the odd semantics explicit. So this introduces the new architecture primitive clear_bit_unlock_is_negative_byte(); and adds the trivial implementation for x86. We have a generic non-optimized fallback (that just does a "clear_bit()"+"test_bit(7)" combination) which can be overridden by any architecture that can do better. According to Nick, Power has the same hickup x86 has, for example, but some other architectures may not even care. All these optimizations mean that my page locking stress-test (which is just executing a lot of small short-lived shell scripts: "make test" in the git source tree) no longer makes our page locking look horribly bad. Before all these optimizations, just the unlock_page() costs were just over 3% of all CPU overhead on "make test". After this, it's down to 0.66%, so just a quarter of the cost it used to be. (The difference on NUMA is bigger, but there this micro-optimization is likely less noticeable, since the big issue on NUMA was not the accesses to 'struct page', but the waitqueue accesses that were already removed by Nick's earlier commit). Acked-by:
Nick Piggin <npiggin@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Bob Peterson <rpeterso@redhat.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Andrew Lutomirski <luto@kernel.org> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- 28 Dec, 2016 2 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds authored
Pull crypto fix from Herbert Xu: "This fixes a hash corruption bug in the marvell driver" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: marvell - Copy IVDIG before launching partial DMA ahash requests
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Various ipvlan fixes from Eric Dumazet and Mahesh Bandewar. The most important is to not assume the packet is RX just because the destination address matches that of the device. Such an assumption causes problems when an interface is put into loopback mode. 2) If we retry when creating a new tc entry (because we dropped the RTNL mutex in order to load a module, for example) we end up with -EAGAIN and then loop trying to replay the request. But we didn't reset some state when looping back to the top like this, and if another thread meanwhile inserted the same tc entry we were trying to, we re-link it creating an enless loop in the tc chain. Fix from Daniel Borkmann. 3) There are two different WRITE bits in the MDIO address register for the stmmac chip, depending upon the chip variant. Due to a bug we could set them both, fix from Hock Leong Kweh. 4) Fix mlx4 bug in XDP_TX handling, from Tariq Toukan. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: net: stmmac: fix incorrect bit set in gmac4 mdio addr register r8169: add support for RTL8168 series add-on card. net: xdp: remove unused bfp_warn_invalid_xdp_buffer() openvswitch: upcall: Fix vlan handling. ipv4: Namespaceify tcp_tw_reuse knob net: korina: Fix NAPI versus resources freeing net, sched: fix soft lockup in tc_classify net/mlx4_en: Fix user prio field in XDP forward tipc: don't send FIN message from connectionless socket ipvlan: fix multicast processing ipvlan: fix various issues in ipvlan_process_multicast()
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- 27 Dec, 2016 12 commits
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Abhishek Sahu authored
The current driver code gives the crash or gets hang while switching the CPU frequency some time. The APSS CPU Clock divider is not glitch free so it the APPS clock need to be switched for stable clock during the change. This patch adds the frequency change notifier for APSS CPU clock. It changes the parent of this clock to stable PLL FEPLL500 for PRE_RATE_CHANGE event. This event will be generated before actual clock set operations. The clock set operation will again change its corresponding parent by getting the same from frequency table. Signed-off-by:
Abhishek Sahu <absahu@codeaurora.org> [sboyd@codeaurora.org: Indent less in probe] Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org>
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Cihangir Akturk authored
In the actual implementation ether_addr_equal function tests for equality to 0 when returning. It seems in commit 0d74c4 it is somehow overlooked to change this operator to reflect the actual function. Signed-off-by:
Cihangir Akturk <cakturk@gmail.com> Signed-off-by:
Jonathan Corbet <corbet@lwn.net>
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John Brooks authored
The 80211.tmpl DocBook file was removed in commit 819bf593 ("docs-rst: sphinxify 802.11 documentation"), but the 80211.xml target was re-added to the Makefile by commit 7ddedebb ("ALSA: doc: ReSTize writing-an-alsa-driver document"), leading to a failure when building the documentation: *** No rule to make target 'Documentation/DocBook/80211.xml', needed by 'Documentation/DocBook/80211.aux.xml'. cc: stable@vger.kernel.org Signed-off-by:
John Brooks <john@fastquake.com> Mea-culpa-by:
Jonathan Corbet <corbet@lwn.net> Signed-off-by:
Jonathan Corbet <corbet@lwn.net>
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Jonathan Corbet authored
Linux 4.10-rc1
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Kweh, Hock Leong authored
Fixing the gmac4 mdio write access to use MII_GMAC4_WRITE only instead of OR together with MII_WRITE. Signed-off-by:
Kweh, Hock Leong <hock.leong.kweh@intel.com> Acked-By:
Joao Pinto <jpinto@synopsys.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Chun-Hao Lin authored
This chip is the same as RTL8168, but its device id is 0x8161. Signed-off-by:
Chun-Hao Lin <hau@realtek.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Jason Wang authored
After commit 73b62bd0 ("virtio-net: remove the warning before XDP linearizing"), there's no users for bpf_warn_invalid_xdp_buffer(), so remove it. This is a revert for commit f23bc46c. Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: John Fastabend <john.r.fastabend@intel.com> Signed-off-by:
Jason Wang <jasowang@redhat.com> Acked-by:
Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
David S. Miller <davem@davemloft.net>
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pravin shelar authored
Networking stack accelerate vlan tag handling by keeping topmost vlan header in skb. This works as long as packet remains in OVS datapath. But during OVS upcall vlan header is pushed on to the packet. When such packet is sent back to OVS datapath, core networking stack might not handle it correctly. Following patch avoids this issue by accelerating the vlan tag during flow key extract. This simplifies datapath by bringing uniform packet processing for packets from all code paths. Fixes: 5108bbad ("openvswitch: add processing of L3 packets"). CC: Jarno Rajahalme <jarno@ovn.org> CC: Jiri Benc <jbenc@redhat.com> Signed-off-by:
Pravin B Shelar <pshelar@ovn.org> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Haishuang Yan authored
Different namespaces might have different requirements to reuse TIME-WAIT sockets for new connections. This might be required in cases where different namespace applications are in place which require TIME_WAIT socket connections to be reduced independently of the host. Signed-off-by:
Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Laura Abbott authored
Christopher Covington reported a crash on aarch64 on recent Fedora kernels: kernel BUG at ./include/linux/scatterlist.h:140! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP Modules linked in: CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc8 #162 Hardware name: linux,dummy-virt (DT) task: ffff80007c650080 task.stack: ffff800008910000 PC is at sg_init_one+0xa0/0xb8 LR is at sg_init_one+0x24/0xb8 ... [<ffff000008398db8>] sg_init_one+0xa0/0xb8 [<ffff000008350a44>] test_acomp+0x10c/0x438 [<ffff000008350e20>] alg_test_comp+0xb0/0x118 [<ffff00000834f28c>] alg_test+0x17c/0x2f0 [<ffff00000834c6a4>] cryptomgr_test+0x44/0x50 [<ffff0000080dac70>] kthread+0xf8/0x128 [<ffff000008082ec0>] ret_from_fork+0x10/0x50 The test vectors used for input are part of the kernel image. These inputs are passed as a buffer to sg_init_one which eventually blows up with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns false for the kernel image since virt_to_page will not return the correct page. Fix this by copying the input vectors to heap buffer before setting up the scatterlist. Reported-by:
Christopher Covington <cov@codeaurora.org> Fixes: d7db7a88 ("crypto: acomp - update testmgr with support for acomp") Signed-off-by:
Laura Abbott <labbott@redhat.com> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au>
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Jan Kara authored
Now that dax_iomap_fault() calls ->iomap_begin() without entry lock, we can use transaction starting in ext4_iomap_begin() and thus simplify ext4_dax_fault(). It also provides us proper retries in case of ENOSPC. Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Dan Williams <dan.j.williams@intel.com>
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Jan Kara authored
Currently ->iomap_begin() handler is called with entry lock held. If the filesystem held any locks between ->iomap_begin() and ->iomap_end() (such as ext4 which will want to hold transaction open), this would cause lock inversion with the iomap_apply() from standard IO path which first calls ->iomap_begin() and only then calls ->actor() callback which grabs entry locks for DAX (if it faults when copying from/to user provided buffers). Fix the problem by nesting grabbing of entry lock inside ->iomap_begin() - ->iomap_end() pair. Reviewed-by:
Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Dan Williams <dan.j.williams@intel.com>
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