- 06 Feb, 2008 40 commits
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Haavard Skinnemoen authored
In atmel_spi_next_xfer, xfer can be NULL because the next transfer may already have been submitted to the PDC (using DMA chaining). This can cause an oops, since the debug message assumed it was never null. The fix changes how those debug messages are issued, ensuring that one is issued each time a transfer is started instead of once per call. Also, properly indent the "can this transfer be chained" test so it's not hidden as if it were non-conditional code. Signed-off-by:
Haavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by:
David Brownell <dbrownell@users.sourceforge.net> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Silvester Erdeg authored
Add support for chained transfers in the atmel_spi driver, letting the DMA controller switch to the next buffer pair without CPU intervention. This reduced I/O latencies by about 2% in one bulk I/O test. It should also help work around several interrelated errata affecting chipselect 0 on at91rm9200 chips. Almost all of the changes are in the reworked atmel_spi_next_xfer() function. That's now called with the driver in one of three states: 1. It isn't transferring anything (in which case the first transfer of the current message is going to be sent) 2. It has finished transfering a non-chainable transfer (in which case it will go to the next transfer in the message) 3. It has finished transfering a chained transfer (in which case the next transfer is already queued) After that it will queue the next transfer if it can be chained. Signed-off-by:Szilveszter Ordog <slipszi@gmail.com> Acked-by:
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Haavard Skinnemoen authored
Don't insert (undesirable) delays between consecutive words (DLYBCT) or when activating chipselects (DLYBS). Removing the between-word delays improves the performance of bulk transfers (such as mtd_dataflash, m25p80, mmc_spi) significantly. In one test, the improvement was a factor of more than eight! (The large DLYBCT value came from the legacy at91 SPI driver, and it's not clear why it used such a huge value.) Signed-off-by:
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David Brownell authored
Don't update dev->power.power_state any more in the SPI core. The only reason to update this scheduled-to-be-removed field was to make the already-removed /sys/devices/.../power/state files work better. Signed-off-by:
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Geert Uytterhoeven authored
Commit edfaa7c3 Driver core: convert block from raw kobjects to core devices This moves the block devices to /sys/class/block. It will create a flat list of all block devices, with the disks and partitions in one directory. For compatibility /sys/block is created and contains symlinks to the disks. introduced a global disk_type variable in <linux/genhd.h>, causing the following compile error on Atari: drivers/block/ataflop.c:93: error: conflicting types for 'disk_type' include/linux/genhd.h:21: error: previous declaration of 'disk_type' was here Rename the local disk_type variable in drivers/block/ataflop.c to atari_disk_type, to avoid the conflict. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Cc: Kay Sievers <kay.sievers@vrfy.org> Acked-by:
Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by:
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David Fries authored
Standardize the temperature units to millidegrees C for the two sensor conversion routines. Previously the routines were, w1_DS18B20_convert_temp degrees C w1_DS18S20_convert_temp millidegrees C Unfortunately this will break any program using the ds18b20 value as it will now be 1000 times bigger. Fortunately there can't be that many users out there, or some of these bugs will have been fixed by now, such as the negative C error (see previous patch) that makes me think the ds18b20 is the better choice to change because of the current bugs. Signed-off-by:
David Fries <david@fries.net> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by:
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Borislav Petkov authored
Simplify logic in cdrom_release() without semantic change. Signed-off-by:
Borislav Petkov <bbpetkov@yahoo.de> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by:
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Evgeniy Polyakov authored
Remvoe variable which actually is not used (except assigning it a value) and confusing break out of the family checking loop. Found by Harry Mason. Signed-off-by:
Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: Harry J Mason <hjm03r@ecs.soton.ac.uk> Signed-off-by:
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Randy Dunlap authored
Fix section mismatch by making the driver template variable name match one of the whitelisted variable names in modpost. WARNING: vmlinux.o(.data+0x7a9e8): Section mismatch: reference to .init.text:tpm_inf_pnp_probe (between 'tpm_inf_pnp' and 'cn_idx') Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Cc: Marcel Selhorst <tpm@selhorst.net> Acked-by:
Sam Ravnborg <sam@ravnborg.org> Signed-off-by:
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Andrew Morton authored
Avoid calling do_div(x, 1) in this case. Cc: David Fries <david@fries.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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David Fries authored
The kernel has a divide by zero crash when trying to run the system timer less than 100Hz. The problem is x/(HZ/USER_HZ) and related. Now x*(USER_HZ/HZ) will be used if HZ<USER_HZ. I'm running the Linux kernel under qemu and went to run a slower system timer to take less CPU (and battery) on the host. I found that the kernel paniced under emulation because of a divide by zero in three places. Here is the patch. The base git was updated today 01-05-2008. I went for a 20Hz system time by adding config HZ_20 etc to kernel/Kconfig.hz. With this patch I verified the system timer by looking at /proc/interrupts. [akpm@linux-foundation.org: partially clean up the macro maze] Signed-off-by:
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Jiri Slaby authored
Specify also sub pci ids to not grab devices with properly set sub ids. This devices has these set (unset) to the same as (plx 9050) ids. Signed-off-by:
Jiri Slaby <jirislaby@gmail.com> Cc: Andreas Block <andreas.block@esd-electronics.com> Cc: Oliver Thimm <oliver.thimm@esd-electronics.com> Signed-off-by:
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Joern Engel authored
I have been prime author and maintainer of block2mtd from day one, but neither MAINTAINERS nor the module source makes this fact clear. And while I'm at it, update my email addresses tree-wide, as the old address currently bounces and change my name to "joern" as unicode will likely continue to cause trouble until the end of this century. Signed-off-by:
Joern Engel <joern@lazybastard.org> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Andy Whitcroft <apw@shadowen.org> Signed-off-by:
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Richard Kennedy authored
Here's a couple of small additions to BUG-HUNTING. 1. point out that you can list code in gdb with only one command (gdb) l *(<symbol> + offset) 2. give a very brief hint how to decode module symbols in call traces Signed-off-by:
Richard Kennedy <richard@rsk.demon.co.uk> Signed-off-by:
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Karsten Wiese authored
schedule_timeout(jiffies) waits for at least jiffies - 1. Add 1 jiffie to the timeout_jiffies calculated in sys_poll() to wait at least timeout_msecs, like poll() manpage says. Signed-off-by:
Karsten Wiese <fzu@wemgehoertderstaat.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by:
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Joe Peterson authored
Fix two N_TTY line discipline issues related to resuming a stopped TTY (typically done with ctrl-S): 1) Fix handling of character that resumes a stopped TTY (with IXANY) With "stty ixany", the TTY line discipline would lose the first character after the stop, so typing, for example, "hi^Sthere" resulted in "hihere" (the 't' would cause the resume after ^S, but it would then be thrown away rather than processed as an input character). This was inconsistent with the behavior of other Unix systems. 2) Fix interrupt signal (e.g. ctrl-C) behavior in stopped TTYs With "stty -ixany" (often the default), interrupt signals were ignored in a stopped TTY until the TTY was resumed with the start char (typically ctrl-Q), which was inconsistent with the behavior of other Unix systems. Signed-off-by:
Joe Peterson <joe@skyrush.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by:
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Daniel Walker authored
Just converting this documentation semaphore reference, since we don't want to promote semaphore usage. Signed-off-by:
Daniel Walker <dwalker@mvista.com> Acked-by:
Corey Minyard <minyard@acm.org> Cc: Greg KH <greg@kroah.com> Signed-off-by:
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Eric Dumazet authored
We can use ilog2() in fs/namespace.c to compute hash_bits and hash_mask at compile time, not runtime. [akpm@linux-foundation.org: clean it all up] Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Signed-off-by:
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Andrew Morton authored
- Account for debug_smp_processor_id()'s own preempt_disable() when displaying the preempt_count(). - 80 cols, not 800. Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Eric Dumazet authored
groups_sort() can be quite long if user loads a large gid table. This is because GROUP_AT(group_info, some_integer) uses an integer divide. So having to do XXX thousand divides during one syscall can lead to very high latencies. (NGROUPS_MAX=65536) In the past (25 Mar 2006), an analog problem was found in groups_search() (commit d74beb9f ) and at that time I changed some variables to unsigned int. I believe that a more generic fix is to make sure NGROUPS_PER_BLOCK is unsigned. Signed-off-by:
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Adrian Bunk authored
Fix the following section mismatch with CONFIG_HOTPLUG=n, CONFIG_HOTPLUG_CPU=y: WARNING: vmlinux.o(.text+0x399a6): Section mismatch: reference to .init.text.5:idle_regs (between 'fork_idle' and 'get_task_mm') Signed-off-by:
Adrian Bunk <bunk@kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by:
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Adrian Bunk authored
calibrate_delay() must be __cpuinit, not __{dev,}init. I've verified that this is correct for all users. While doing the latter, I also did the following cleanups: - remove pointless additional prototypes in C files - ensure all users #include <linux/delay.h> This fixes the following section mismatches with CONFIG_HOTPLUG=n, CONFIG_HOTPLUG_CPU=y: WARNING: vmlinux.o(.text+0x1128d): Section mismatch: reference to .init.text.1:calibrate_delay (between 'check_cx686_slop' and 'set_cx86_reorder') WARNING: vmlinux.o(.text+0x25102): Section mismatch: reference to .init.text.1:calibrate_delay (between 'smp_callin' and 'cpu_coregroup_map') Signed-off-by: -
Richard Knutsson authored
Fixing: CHECK kernel/params.c kernel/params.c:329:41: warning: incorrect type in argument 8 (different signedness) kernel/params.c:329:41: expected int *num kernel/params.c:329:41: got unsigned int * Signed-off-by:
Richard Knutsson <ricknu-0@student.ltu.se> Signed-off-by:
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Eric Dumazet authored
Actual code let compiler generates idiv instruction on x86. Using a right shift is OK here and readable as well. Before patch 10: 57 push %edi 11: 56 push %esi 12: 89 d6 mov %edx,%esi 14: 53 push %ebx 15: 89 c3 mov %eax,%ebx 17: eb 22 jmp 3b <search_extable+0x2b> 19: 89 f0 mov %esi,%eax 1b: ba 02 00 00 00 mov $0x2,%edx 20: 29 d8 sub %ebx,%eax 22: 89 d7 mov %edx,%edi 24: c1 f8 03 sar $0x3,%eax 27: 99 cltd 28: f7 ff idiv %edi 2a: 8d 04 c3 lea (%ebx,%eax,8),%eax 2d: 39 08 cmp %ecx,(%eax) ... After patch 00000010 <search_extable>: 10: 53 push %ebx 11: 89 c3 mov %eax,%ebx 13: eb 18 jmp 2d <search_extable+0x1d> 15: 89 d0 mov %edx,%eax 17: 29 d8 sub %ebx,%eax 19: c1 f8 04 sar $0x4,%eax 1c: 8d 04 c3 lea (%ebx,%eax,8),%eax 1f: 39 08 cmp %ecx,(%eax) ... Signed-off-by:
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Petr Cvek authored
Add detection for IT87XX SuperIO chip and disabling its POST feature, which made noise on parallel port's pins. Signed-off-by:
Petr Cvek <petr.cvek@tul.cz> Signed-off-by:
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Nick Warne authored
Add the Dell UK 6400 Inspiron model (MM061) to allow the i8k module to load correctly without using 'force=1' Signed-off-by:
"Nick Warne" <nick@ukfsn.org> Signed-off-by:
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Thomas Bogendoerfer authored
Use DEFAULT_SGI_PARTITION for SGI_PARTION default Signed-off-by:
Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by:
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Christian Pellegrin authored
Fix wrong netmos 9855 serial port configuration. On loading only one serial port was present and it wasn't working. After looking in the data sheet I realized that the base address was wrong. For further reference here is lspci and relevant dmesg output: 02:00.0 Communication controller: NetMos Technology PCI 9855 Multi-I/O Controller (rev 01) (prog-if 02) Subsystem: LSI Logic / Symbios Logic Unknown device 0022 Flags: medium devsel, IRQ 19 I/O ports at df00 [size=8] I/O ports at de00 [size=8] I/O ports at dd00 [size=8] I/O ports at dc00 [size=8] I/O ports at db00 [size=8] I/O ports at da00 [size=16] parport1: PC-style at 0xdd00 [PCSPP,TRISTATE] parport2: PC-style at 0xdf00 [PCSPP,TRISTATE,EPP] 0000:02:00.0: ttyS0 at I/O 0xdb00 (irq = 19) is a 16550A 0000:02:00.0: ttyS1 at I/O 0xda00 (irq = 19) is a 16550A Signed-off-by:Christian Pellegrin <chripell@fsfe.org> Cc: Thomas Richter <thor@math.TU-Berlin.DE> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Martin Schitter <ms@gewi.kfunigraz.ac.at> Signed-off-by:
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Luís P Mendes authored
Added pci device id for the Quatech SPPXP-100 ExpressCard - 0x278 - to include/linux/pci_id.h Modified drivers/parport/parport_pc.c to support the Quatech SPPXP-100 Parallel port PCI ExpressCard [akpm@linux-foundation.org: build fix] Signed-off-by:
Luís P Mendes <luis.p.mendes@gmail.com> Signed-off-by:
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Nick Piggin authored
ext2 should not worry about checking sb->s_blocksize for XIP before the sb's blocksize actually gets set. Signed-off-by:
Nick Piggin <npiggin@suse.de> Acked-by:
Carsten Otte <cotte@de.ibm.com> Signed-off-by:
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Daniel Walker authored
The port_write_mutex was converted from a semaphore to a mutex, but there was still this ifdef'd init_MUTEX reference remaining. Signed-off-by:
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Daniel Walker authored
[akpm@linux-foundation.org: cleanup] Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Denis Cheng authored
Signed-off-by:
Denis Cheng <crquan@gmail.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Jeff Mahoney <jeffm@suse.com> Signed-off-by:
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Denis Cheng authored
Signed-off-by:
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Daniel Walker authored
I converted some of the document to reflect mutex usage instead of semaphore usage. Since we shouldin't be promoting semaphore usage when it's on it's way out.. Signed-off-by:
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Joe Peterson authored
Turn on INTR/QUIT/SUSP echoing in the N_TTY line discipline (e.g. ctrl-C will appear as "^C" if stty echoctl is set and ctrl-C is set as INTR). Linux seems to be the only unix-like OS (recently I've verified this on Solaris, BSD, and Mac OS X) that does *not* behave this way, and I really miss this as a good visual confirmation of the interrupt of a program in the console or xterm. I remember this fondly from many Unixs I've used over the years as well. Bringing this to Linux also seems like a good way to make it yet more compliant with standard unix-like behavior. [akpm@linux-foundation.org: coding-style fixes] Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by:
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Roland McGrath authored
This adds support to allow asm/ptrace.h to define two new macros, arch_ptrace_stop_needed and arch_ptrace_stop. These control special machine-specific actions to be done before a ptrace stop. The new code compiles away to nothing when the new macros are not defined. This is the case on all machines to begin with. On ia64, these macros will be defined to solve the long-standing issue of ptrace vs register backing store. Signed-off-by:
Roland McGrath <roland@redhat.com> Cc: Petr Tesarik <ptesarik@suse.cz> Cc: Tony Luck <tony.luck@intel.com> Cc: Matthew Wilcox <willy@debian.org> Signed-off-by:
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Jan Kara authored
We restarted scan of sb->s_inodes list whenever we had to drop inode_lock in add_dquot_ref(). This leads to overall quadratic running time and thus add_dquot_ref() can take several minutes when called on a life filesystem. We fix the problem by using the fact that inode cannot be removed from s_inodes list while we hold a reference to it and thus we can safely restart the scan if we don't drop the reference. Here we use the fact that inodes freshly added to s_inodes list are already guaranteed to have quotas properly initialized and the ordering of inodes on s_inodes list does not change so we cannot skip any inode. Thanks goes to Nick <gentuu@gmail.com> for analyzing the problem and testing the fix. [akpm@linux-foundation.org: iput(NULL) is legal] Signed-off-by:
Jan Kara <jack@suse.cz> Cc: Nick <gentuu@gmail.com> Signed-off-by:
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Denis Cheng authored
single list_head variable initialized with LIST_HEAD_INIT could almost always can be replaced with LIST_HEAD declaration, this shrinks the code and looks better. Signed-off-by:
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Nick Piggin authored
Convert uio from nopage to fault. Signed-off-by:
Hans J Koch <hjk@linutronix.de> Signed-off-by:
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