1. 21 Sep, 2014 2 commits
    • Hans Verkuil's avatar
      [media] videobuf2-core: add comments before the WARN_ON · 23cd08c8
      Hans Verkuil authored
      Recently WARN_ON() calls have been added to warn if the driver is not
      properly returning buffers to vb2 in start_streaming (if it fails) or
      stop_streaming(). Add comments before those WARN_ON calls that refer
      to the videobuf2-core.h header that explains what drivers are supposed
      to do in these situations. That should help point developers in the
      right direction if they see these warnings.
      Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
      Acked-by: default avatarPawel Osciak <pawel@osciak.com>
      Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
      23cd08c8
    • Hans Verkuil's avatar
      [media] videobuf2-dma-sg: fix for wrong GFP mask to sg_alloc_table_from_pages · 47bc59c5
      Hans Verkuil authored
      sg_alloc_table_from_pages() only allocates a sg_table, so it should just use
      GFP_KERNEL, not gfp_flags. If gfp_flags contains __GFP_DMA32 then mm/sl[au]b.c
      will call BUG_ON:
      
      [  358.027515] ------------[ cut here ]------------
      [  358.027546] kernel BUG at mm/slub.c:1416!
      [  358.027558] invalid opcode: 0000 [#1] PREEMPT SMP
      [  358.027576] Modules linked in: mt2131 s5h1409 tda8290 tuner cx25840 cx23885 btcx_risc altera_ci tda18271 altera_stapl videobuf2_dvb tveeprom cx2341x videobuf2_dma_sg dvb_core rc_core videobuf2_memops videobuf2_core nouveau zr36067 videocodec v4l2_common videodev media x86_pkg_temp_thermal cfbfillrect cfbimgblt cfbcopyarea ttm drm_kms_helper processor button isci
      [  358.027712] CPU: 19 PID: 3654 Comm: cat Not tainted 3.16.0-rc6-telek #167
      [  358.027723] Hardware name: ASUSTeK COMPUTER INC. Z9PE-D8 WS/Z9PE-D8 WS, BIOS 5404 02/10/2014
      [  358.027741] task: ffff880897c7d960 ti: ffff88089b4d4000 task.ti: ffff88089b4d4000
      [  358.027753] RIP: 0010:[<ffffffff81196040>]  [<ffffffff81196040>] new_slab+0x280/0x320
      [  358.027776] RSP: 0018:ffff88089b4d7ae8  EFLAGS: 00010002
      [  358.027787] RAX: ffff880897c7d960 RBX: 0000000000000000 RCX: ffff88089b4d7b50
      [  358.027798] RDX: 00000000ffffffff RSI: 0000000000000004 RDI: ffff88089f803b00
      [  358.027809] RBP: ffff88089b4d7bb8 R08: 0000000000000000 R09: 0000000100400040
      [  358.027821] R10: 0000160000000000 R11: ffff88109bc02c40 R12: 0000000000000001
      [  358.027832] R13: ffff88089f8000c0 R14: ffff88089f803b00 R15: ffff8810bfcf4be0
      [  358.027845] FS:  00007f83fe5c0700(0000) GS:ffff8810bfce0000(0000) knlGS:0000000000000000
      [  358.027858] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  358.027868] CR2: 0000000001dfd568 CR3: 0000001097d5a000 CR4: 00000000000407e0
      [  358.027878] Stack:
      [  358.027885]  ffffffff81198860 ffff8810bfcf4be0 ffff880897c7d960 0000000000001b00
      [  358.027905]  ffff880897c7d960 0000000000000000 ffff8810bfcf4bf0 0000000000000000
      [  358.027924]  0000000000000000 0000000100000100 ffffffff813ef84a 00000004ffffffff
      [  358.027944] Call Trace:
      [  358.027956]  [<ffffffff81198860>] ? __slab_alloc+0x400/0x4e0
      [  358.027973]  [<ffffffff813ef84a>] ? sg_kmalloc+0x1a/0x30
      [  358.027985]  [<ffffffff81198f17>] __kmalloc+0x127/0x150
      [  358.027997]  [<ffffffff813ef84a>] ? sg_kmalloc+0x1a/0x30
      [  358.028009]  [<ffffffff813ef84a>] sg_kmalloc+0x1a/0x30
      [  358.028023]  [<ffffffff813eff84>] __sg_alloc_table+0x74/0x180
      [  358.028035]  [<ffffffff813ef830>] ? sg_kfree+0x20/0x20
      [  358.028048]  [<ffffffff813f00af>] sg_alloc_table+0x1f/0x60
      [  358.028061]  [<ffffffff813f0174>] sg_alloc_table_from_pages+0x84/0x1f0
      [  358.028077]  [<ffffffffa007c3f9>] vb2_dma_sg_alloc+0x159/0x230 [videobuf2_dma_sg]
      [  358.028095]  [<ffffffffa003d55a>] __vb2_queue_alloc+0x10a/0x680 [videobuf2_core]
      [  358.028113]  [<ffffffffa003e110>] __reqbufs.isra.14+0x220/0x3e0 [videobuf2_core]
      [  358.028130]  [<ffffffffa003e79d>] __vb2_init_fileio+0xbd/0x380 [videobuf2_core]
      [  358.028147]  [<ffffffffa003f563>] __vb2_perform_fileio+0x5b3/0x6e0 [videobuf2_core]
      [  358.028164]  [<ffffffffa003f871>] vb2_fop_read+0xb1/0x100 [videobuf2_core]
      [  358.028184]  [<ffffffffa06dd2e5>] v4l2_read+0x65/0xb0 [videodev]
      [  358.028198]  [<ffffffff811a243f>] vfs_read+0x8f/0x170
      [  358.028210]  [<ffffffff811a30a1>] SyS_read+0x41/0xb0
      [  358.028224]  [<ffffffff818f02e9>] system_call_fastpath+0x16/0x1b
      [  358.028234] Code: 66 90 e9 dc fd ff ff 0f 1f 40 00 41 8b 4d 68 e9 d5 fe ff ff 0f 1f 80 00 00 00 00 f0 41 80 4d 00 40 e9 03 ff ff ff 0f 1f 44 00 00 <0f> 0b 66 0f 1f 44 00 00 44 89 c6 4c 89 45 d0 e8 0c 82 ff ff 48
      [  358.028415] RIP  [<ffffffff81196040>] new_slab+0x280/0x320
      [  358.028432]  RSP <ffff88089b4d7ae8>
      [  358.032208] ---[ end trace 6443240199c706e4 ]---
      Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
      Cc: stable@vger.kernel.org      # for v3.13 and up
      Acked-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
      Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
      47bc59c5
  2. 04 Sep, 2014 5 commits
  3. 03 Sep, 2014 3 commits
  4. 16 Aug, 2014 30 commits