drivers/media/platform/ti-vpe/vpdma.c: In function 'dump_dtd':
   include/linux/dynamic_debug.h:64:16: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'dma_addr_t' [-Wformat=]
     static struct _ddebug  __aligned(8)   \
                   ^
   include/linux/dynamic_debug.h:76:2: note: in expansion of macro 'DEFINE_DYNAMIC_DEBUG_METADATA'
     DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);  \
     ^
   include/linux/printk.h:263:2: note: in expansion of macro 'dynamic_pr_debug'
     dynamic_pr_debug(fmt, ##__VA_ARGS__)
     ^
>> drivers/media/platform/ti-vpe/vpdma.c:587:2: note: in expansion of macro 'pr_debug'
     pr_debug("word2: start_addr = 0x%08x\n", dtd->start_addr);
     ^
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/exynos-gsc/gsc-m2m.c: In function 'gsc_m2m_reqbufs':
drivers/media/platform/exynos-gsc/gsc-m2m.c:365:20: warning: variable 'frame' s
et but not used [-Wunused-but-set-variable]
  struct gsc_frame *frame;
                    ^
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/exynos-gsc/gsc-core.c: In function 'gsc_probe':
drivers/media/platform/exynos-gsc/gsc-core.c:1089:2: warning: comparison is alw
ays false due to limited range of data type [-Wtype-limits]
  if (gsc->id < 0 || gsc->id >= drv_data->num_entities) {
  ^

gsc->id is declared as u16, so it should always be a positive
value.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/davinci/dm355_ccdc.c:463:5: warning: no previous prototy
pe for 'ccdc_write_dfc_entry' [-Wmissing-prototypes]
 int ccdc_write_dfc_entry(int index, struct ccdc_vertical_dft *dfc)
     ^
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/davinci/dm644x_ccdc.c:133:6: warning: no previous protot
ype for 'ccdc_setwin' [-Wmissing-prototypes]
 void ccdc_setwin(struct v4l2_rect *image_win,
      ^
drivers/media/platform/davinci/dm644x_ccdc.c:373:6: warning: no previous protot
ype for 'ccdc_config_ycbcr' [-Wmissing-prototypes]
 void ccdc_config_ycbcr(void)
      ^
drivers/media/platform/davinci/dm644x_ccdc.c:526:6: warning: no previous protot
ype for 'ccdc_config_raw' [-Wmissing-prototypes]
 void ccdc_config_raw(void)
      ^
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/davinci/vpif_capture.c: In function 'vpif_channel_isr':
drivers/media/platform/davinci/vpif_capture.c:376:18: warning: variable 'field'
 set but not used [-Wunused-but-set-variable]
  enum v4l2_field field;
                  ^
drivers/media/platform/davinci/vpif_capture.c: In function 'vpif_calculate_offs
ets':
drivers/media/platform/davinci/vpif_capture.c:536:23: warning: variable 'vpitch
' set but not used [-Wunused-but-set-variable]
  unsigned int hpitch, vpitch, sizeimage;
                       ^
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/davinci/vpif_display.c: In function 'vpif_channel_isr':
drivers/media/platform/davinci/vpif_display.c:363:18: warning: variable 'field'
 set but not used [-Wunused-but-set-variable]
  enum v4l2_field field;
                  ^
drivers/media/platform/davinci/vpif_display.c: In function 'vpif_calculate_offs
ets':
drivers/media/platform/davinci/vpif_display.c:505:23: warning: variable 'vpitch
' set but not used [-Wunused-but-set-variable]
  unsigned int hpitch, vpitch, sizeimage;
                       ^
drivers/media/platform/davinci/vpif_display.c: In function 'vpif_set_output':
drivers/media/platform/davinci/vpif_display.c:816:27: warning: variable 'subdev
_info' set but not used [-Wunused-but-set-variable]
  struct vpif_subdev_info *subdev_info = NULL;
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Fix build when CONFIG_INPUT_EVDEV=m and DVB_AV7110=y.
Only build av7110_ir.c when CONFIG_INPUT_EVDEV is compatible with
CONFIG_DVB_AV7110.

Fixes these build errors:

drivers/built-in.o: In function `input_sync':
av7110_ir.c:(.text+0x1223ac): undefined reference to `input_event'
drivers/built-in.o: In function `av7110_emit_key':
av7110_ir.c:(.text+0x12247c): undefined reference to `input_event'
av7110_ir.c:(.text+0x122495): undefined reference to `input_event'
av7110_ir.c:(.text+0x122569): undefined reference to `input_event'
av7110_ir.c:(.text+0x1225a7): undefined reference to `input_event'
drivers/built-in.o:av7110_ir.c:(.text+0x122629): more undefined
references to `input_event' follow
drivers/built-in.o: In function `av7110_ir_init':
(.text+0x1227e4): undefined reference to `input_allocate_device'
drivers/built-in.o: In function `av7110_ir_init':
(.text+0x12298f): undefined reference to `input_register_device'
drivers/built-in.o: In function `av7110_ir_init':
(.text+0x12299e): undefined reference to `input_free_device'
drivers/built-in.o: In function `av7110_ir_exit':
(.text+0x122a94): undefined reference to `input_unregister_device'

drivers/built-in.o: In function `av7110_detach':
av7110.c:(.text+0x228d4a): undefined reference to `av7110_ir_exit'
drivers/built-in.o: In function `arm_thread':
av7110.c:(.text+0x22a404): undefined reference to `av7110_check_ir_config'
av7110.c:(.text+0x22a626): undefined reference to `av7110_check_ir_config'
drivers/built-in.o: In function `av7110_attach':
av7110.c:(.text+0x22b08c): undefined reference to `av7110_ir_init'
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Jim Davis <jim.epost@gmail.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Now that alsa code is part of the driver, it can be compiled
only if alsa is enabled.

   drivers/built-in.o: In function `snd_usbtv_hw_free':
>> usbtv-audio.c:(.text+0x21eb55): undefined reference to `snd_pcm_lib_free_pages'
   drivers/built-in.o: In function `snd_usbtv_hw_params':
>> usbtv-audio.c:(.text+0x21eb72): undefined reference to `snd_pcm_lib_malloc_pages'
   drivers/built-in.o: In function `usbtv_audio_urb_received':
>> usbtv-audio.c:(.text+0x21ed66): undefined reference to `snd_pcm_link_rwlock'
>> usbtv-audio.c:(.text+0x21ed9f): undefined reference to `snd_pcm_link_rwlock'
>> usbtv-audio.c:(.text+0x21edf5): undefined reference to `snd_pcm_period_elapsed'
   drivers/built-in.o: In function `usbtv_audio_init':
>> (.text+0x21f00a): undefined reference to `snd_card_new'
   drivers/built-in.o: In function `usbtv_audio_init':
>> (.text+0x21f0a2): undefined reference to `snd_pcm_new'
   drivers/built-in.o: In function `usbtv_audio_init':
>> (.text+0x21f0e5): undefined reference to `snd_pcm_set_ops'
   drivers/built-in.o: In function `usbtv_audio_init':
>> (.text+0x21f103): undefined reference to `snd_pcm_lib_preallocate_pages_for_all'
   drivers/built-in.o: In function `usbtv_audio_init':
>> (.text+0x21f10c): undefined reference to `snd_card_register'
   drivers/built-in.o: In function `usbtv_audio_init':
>> (.text+0x21f12a): undefined reference to `snd_card_free'
   drivers/built-in.o: In function `usbtv_audio_free':
>> (.text+0x21f15c): undefined reference to `snd_card_free'
>> drivers/built-in.o:(.data+0x43250): undefined reference to `snd_pcm_lib_ioctl'
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

au0828 doesn't resume correctly and TV tuning fails with
xc_set_signal_source(0) failed message. Change au0828 dvb
suspend and resume interfaces to suspend and resume frontend
during suspend and resume respectively. dvb_frontend_suspend()
suspends tuner and fe using tuner and fe ops. dvb_frontend_resume()
resumes fe and tuner using fe and tuner ops ini before waking up
the frontend. With this change HVR950Q suspend and resume work
when system gets suspended when digital function is tuned to a
channel and with active TV stream, and after resume it went right
back to active TV stream.
Signed-off-by: Shuah Khan <shuah.kh@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

The correct field order in progressive mode is V4L2_FIELD_NONE, not V4L2_FIELD_INTERLACED.

Cc: <stable@vger.kernel.org>
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

When a new video frame is started, the driver takes the next video buffer from
the list of active buffers and moves it to dev->usb_ctl.vid_buf / dev->usb_ctl.vbi_buf
for further processing.

On streaming stop we currently only give back the pending buffers from the list
but not the ones which are currently processed.

This causes the following warning from the vb2 core since kernel 3.15:

...
 ------------[ cut here ]------------
 WARNING: CPU: 1 PID: 2284 at drivers/media/v4l2-core/videobuf2-core.c:2115 __vb2_queue_cancel+0xed/0x150 [videobuf2_core]()
 [...]
 Call Trace:
  [<c0769c46>] dump_stack+0x48/0x69
  [<c0245b69>] warn_slowpath_common+0x79/0x90
  [<f925e4ad>] ? __vb2_queue_cancel+0xed/0x150 [videobuf2_core]
  [<f925e4ad>] ? __vb2_queue_cancel+0xed/0x150 [videobuf2_core]
  [<c0245bfd>] warn_slowpath_null+0x1d/0x20
  [<f925e4ad>] __vb2_queue_cancel+0xed/0x150 [videobuf2_core]
  [<f925fa35>] vb2_internal_streamoff+0x35/0x90 [videobuf2_core]
  [<f925fac5>] vb2_streamoff+0x35/0x60 [videobuf2_core]
  [<f925fb27>] vb2_ioctl_streamoff+0x37/0x40 [videobuf2_core]
  [<f8e45895>] v4l_streamoff+0x15/0x20 [videodev]
  [<f8e4925d>] __video_do_ioctl+0x23d/0x2d0 [videodev]
  [<f8e49020>] ? video_ioctl2+0x20/0x20 [videodev]
  [<f8e48c63>] video_usercopy+0x203/0x5a0 [videodev]
  [<f8e49020>] ? video_ioctl2+0x20/0x20 [videodev]
  [<c039d0e7>] ? fsnotify+0x1e7/0x2b0
  [<f8e49012>] video_ioctl2+0x12/0x20 [videodev]
  [<f8e49020>] ? video_ioctl2+0x20/0x20 [videodev]
  [<f8e4461e>] v4l2_ioctl+0xee/0x130 [videodev]
  [<f8e44530>] ? v4l2_open+0xf0/0xf0 [videodev]
  [<c0378de2>] do_vfs_ioctl+0x2e2/0x4d0
  [<c0368eec>] ? vfs_write+0x13c/0x1c0
  [<c0369a8f>] ? vfs_writev+0x2f/0x50
  [<c0379028>] SyS_ioctl+0x58/0x80
  [<c076fff3>] sysenter_do_call+0x12/0x12
 ---[ end trace 5545f934409f13f4 ]---
...

Many thanks to Hans Verkuil, whose recently added check in the vb2 core unveiled
this long standing issue and who has investigated it further.

Cc: <stable@vger.kernel.org>
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

So we can remove the same defines in the driver code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

So we can remove the same defines in the driver code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Fix a copy-paste bug when converting to the control framework.

Fixes: commit 5d478e0d ("[media] tda7432: convert to the control framework")
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

So we can remove the same defines in the driver code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

So we can remove the same defines in the driver code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

So we can remove the same defines in the driver code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

So we can remove the same defines in the driver code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Constify event type constants and correct motion detection event number
(it's 6, not 5).
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Make the front panel buttons working after another button on the
remote was pressed.
Signed-off-by: Ulrich Eckhardt <uli@uli-eckhardt.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Add the key table for the Thermaltake DH-102 to the USB-Id 15c2:0034.
Signed-off-by: Ulrich Eckhardt <uli@uli-eckhardt.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

This patch defines the keytables per USB Device ID.
Signed-off-by: Ulrich Eckhardt <uli@uli-eckhardt.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

It makes more sense to return PTR_ERR(iss->iss_ctrlclk) here. The
current code looks like an oversight in pasting the block just above
this one.
Signed-off-by: Vitaly Osipov <vitaly.osipov@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Add an ALSA handler inside usbtv module, in order to make
audio to work with those devices.
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Tested-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

In the list of subdirectories compiled, b2c2/ appears twice.

This patch removes one of the appearances.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Using the managed function the kfree() calls can be removed from the
probe error path and the remove handler.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Modern kernels enable dynamic printk support, which is fine, except when it is
combined with a debug module option. Enabling debug in videobuf2-core now produces
no debugging unless it is also enabled through the dynamic printk support in debugfs.

Either use a debug module option + pr_info, or use pr_debug without a debug module
option. In this case the fact that you can set various debug levels is very useful,
so I believe that for videobuf2-core.c we should use pr_info.

The mix of the two is very confusing: I've spent too much time already trying to
figure out why I am not seeing any debug output in the kernel log when I do:

	echo 1 >/sys/modules/videobuf2_core/parameters/debug
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

The order of the last two fields in the G/S_EDID specification was swapped from
what is in the actual struct. Fix this.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

The following lockdep warning has been there ever since commit a517cca6
one year ago:

[  403.117947] ======================================================
[  403.117949] [ INFO: possible circular locking dependency detected ]
[  403.117953] 3.16.0-rc6-test-media #961 Not tainted
[  403.117954] -------------------------------------------------------
[  403.117956] v4l2-ctl/15377 is trying to acquire lock:
[  403.117959]  (&dev->mutex#3){+.+.+.}, at: [<ffffffffa005a6c3>] vb2_fop_mmap+0x33/0x90 [videobuf2_core]
[  403.117974]
[  403.117974] but task is already holding lock:
[  403.117976]  (&mm->mmap_sem){++++++}, at: [<ffffffff8118291f>] vm_mmap_pgoff+0x6f/0xc0
[  403.117987]
[  403.117987] which lock already depends on the new lock.
[  403.117987]
[  403.117990]
[  403.117990] the existing dependency chain (in reverse order) is:
[  403.117992]
[  403.117992] -> #1 (&mm->mmap_sem){++++++}:
[  403.117997]        [<ffffffff810d733c>] validate_chain.isra.39+0x5fc/0x9a0
[  403.118006]        [<ffffffff810d8bc3>] __lock_acquire+0x4d3/0xd30
[  403.118010]        [<ffffffff810d9da7>] lock_acquire+0xa7/0x160
[  403.118014]        [<ffffffff8118c9ec>] might_fault+0x7c/0xb0
[  403.118018]        [<ffffffffa0028a25>] video_usercopy+0x425/0x610 [videodev]
[  403.118028]        [<ffffffffa0028c25>] video_ioctl2+0x15/0x20 [videodev]
[  403.118034]        [<ffffffffa0022764>] v4l2_ioctl+0x184/0x1a0 [videodev]
[  403.118040]        [<ffffffff811d77d0>] do_vfs_ioctl+0x2f0/0x4f0
[  403.118307]        [<ffffffff811d7a51>] SyS_ioctl+0x81/0xa0
[  403.118311]        [<ffffffff8199dc69>] system_call_fastpath+0x16/0x1b
[  403.118319]
[  403.118319] -> #0 (&dev->mutex#3){+.+.+.}:
[  403.118324]        [<ffffffff810d6a96>] check_prevs_add+0x746/0x9f0
[  403.118329]        [<ffffffff810d733c>] validate_chain.isra.39+0x5fc/0x9a0
[  403.118333]        [<ffffffff810d8bc3>] __lock_acquire+0x4d3/0xd30
[  403.118336]        [<ffffffff810d9da7>] lock_acquire+0xa7/0x160
[  403.118340]        [<ffffffff81999664>] mutex_lock_interruptible_nested+0x64/0x640
[  403.118344]        [<ffffffffa005a6c3>] vb2_fop_mmap+0x33/0x90 [videobuf2_core]
[  403.118349]        [<ffffffffa0022122>] v4l2_mmap+0x62/0xa0 [videodev]
[  403.118354]        [<ffffffff81197270>] mmap_region+0x3d0/0x5d0
[  403.118359]        [<ffffffff8119778d>] do_mmap_pgoff+0x31d/0x400
[  403.118363]        [<ffffffff81182940>] vm_mmap_pgoff+0x90/0xc0
[  403.118366]        [<ffffffff81195cef>] SyS_mmap_pgoff+0x1df/0x2a0
[  403.118369]        [<ffffffff810085c2>] SyS_mmap+0x22/0x30
[  403.118376]        [<ffffffff8199dc69>] system_call_fastpath+0x16/0x1b
[  403.118381]
[  403.118381] other info that might help us debug this:
[  403.118381]
[  403.118383]  Possible unsafe locking scenario:
[  403.118383]
[  403.118385]        CPU0                    CPU1
[  403.118387]        ----                    ----
[  403.118388]   lock(&mm->mmap_sem);
[  403.118391]                                lock(&dev->mutex#3);
[  403.118394]                                lock(&mm->mmap_sem);
[  403.118397]   lock(&dev->mutex#3);
[  403.118400]
[  403.118400]  *** DEADLOCK ***
[  403.118400]
[  403.118403] 1 lock held by v4l2-ctl/15377:
[  403.118405]  #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff8118291f>] vm_mmap_pgoff+0x6f/0xc0
[  403.118411]
[  403.118411] stack backtrace:
[  403.118415] CPU: 0 PID: 15377 Comm: v4l2-ctl Not tainted 3.16.0-rc6-test-media #961
[  403.118418] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
[  403.118420]  ffffffff82a6c9d0 ffff8800af37fb00 ffffffff819916a2 ffffffff82a6c9d0
[  403.118425]  ffff8800af37fb40 ffffffff810d5715 ffff8802308e4200 0000000000000000
[  403.118429]  ffff8802308e4a48 ffff8802308e4a48 ffff8802308e4200 0000000000000001
[  403.118433] Call Trace:
[  403.118441]  [<ffffffff819916a2>] dump_stack+0x4e/0x7a
[  403.118445]  [<ffffffff810d5715>] print_circular_bug+0x1d5/0x2a0
[  403.118449]  [<ffffffff810d6a96>] check_prevs_add+0x746/0x9f0
[  403.118455]  [<ffffffff8119c172>] ? find_vmap_area+0x42/0x70
[  403.118459]  [<ffffffff810d733c>] validate_chain.isra.39+0x5fc/0x9a0
[  403.118463]  [<ffffffff810d8bc3>] __lock_acquire+0x4d3/0xd30
[  403.118468]  [<ffffffff810d9da7>] lock_acquire+0xa7/0x160
[  403.118472]  [<ffffffffa005a6c3>] ? vb2_fop_mmap+0x33/0x90 [videobuf2_core]
[  403.118476]  [<ffffffffa005a6c3>] ? vb2_fop_mmap+0x33/0x90 [videobuf2_core]
[  403.118480]  [<ffffffff81999664>] mutex_lock_interruptible_nested+0x64/0x640
[  403.118484]  [<ffffffffa005a6c3>] ? vb2_fop_mmap+0x33/0x90 [videobuf2_core]
[  403.118488]  [<ffffffffa005a6c3>] ? vb2_fop_mmap+0x33/0x90 [videobuf2_core]
[  403.118493]  [<ffffffff810d8055>] ? mark_held_locks+0x75/0xa0
[  403.118497]  [<ffffffffa005a6c3>] vb2_fop_mmap+0x33/0x90 [videobuf2_core]
[  403.118502]  [<ffffffffa0022122>] v4l2_mmap+0x62/0xa0 [videodev]
[  403.118506]  [<ffffffff81197270>] mmap_region+0x3d0/0x5d0
[  403.118510]  [<ffffffff8119778d>] do_mmap_pgoff+0x31d/0x400
[  403.118513]  [<ffffffff81182940>] vm_mmap_pgoff+0x90/0xc0
[  403.118517]  [<ffffffff81195cef>] SyS_mmap_pgoff+0x1df/0x2a0
[  403.118521]  [<ffffffff810085c2>] SyS_mmap+0x22/0x30
[  403.118525]  [<ffffffff8199dc69>] system_call_fastpath+0x16/0x1b

The reason is that vb2_fop_mmap and vb2_fop_get_unmapped_area take the core lock
while they are called with the mmap_sem semaphore held. But elsewhere in the code
the core lock is taken first but calls to copy_to/from_user() can take the mmap_sem
semaphore as well, potentially causing a classical A-B/B-A deadlock.

However, the mmap/get_unmapped_area calls really shouldn't take the core lock
at all. So what would happen if they don't take the core lock anymore?

There are two situations that need to be taken into account: calling mmap while
new buffers are being added and calling mmap while buffers are being deleted.

The first case works almost fine without a lock: in all cases mmap relies on
correctly filled-in q->num_buffers/q->num_planes values and those are only
updated by reqbufs and create_buffers *after* any new buffers have been
initialized completely. Except in one case: if an error occurred while allocating
the buffers it will increase num_buffers and rely on __vb2_queue_free to
decrease it again. So there is a short period where the buffer information
may be wrong.

The second case definitely does pose a problem: buffers may be in the process
of being deleted, without the internal structure being updated.

In order to fix this a new mutex is added to vb2_queue that is taken when
buffers are allocated or deleted, and in vb2_mmap. That way vb2_mmap won't
get stale buffer data. Note that this is a problem only for MEMORY_MMAP, so
even though __qbuf_userptr and __qbuf_dmabuf also mess around with buffers
(mem_priv in particular), this doesn't clash with vb2_mmap or
vb2_get_unmapped_area since those are MMAP specific.

As an additional bonus the hack in __buf_prepare, the USERPTR case, can be
removed as well since mmap() no longer takes the core lock.

All in all a much cleaner solution.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

The "i--" needs to happen at the start of the loop or it will try to
release something bogus (probably it will crash) and it won't release
the first ->vaddr_page[].

Fixes: 7b4eeed1 ('[media] vmalloc_sg: make sure all pages in vmalloc area are really DMA-ready')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

This is needed to free state and for dvb_detach() to be
called.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

In order to get FE_HAS_SYNC, the viterbi should already be
locked too. So, add the missing FE_HAS_VITERBI lock.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Move as102-fe to dvb-frontends directory and make it an
independent driver.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Remove the dependencies of as102_cmd from as102, in order to
allow it to be compiled as a separate module.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

This function just converts from the as10x internal data into
the DVBv5 cache. Get rid of it.

No functional changes.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

This function just parses the frontend cache and converts
to the as102 internal format message. Get rid of it.

No functional changes.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Avoid having function prototypes by moving some
ancillary routines to the beginning of the file.

No functional changes.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>