On 08/03/17 18:47, Anton Sviridenko wrote:
> Fixes warning that appears in dmesg after closing V4L2 userspace
> application that plays video from the display device
> (first device from V4L2 device nodes provided by solo, usually /dev/video0
> when no other V4L2 devices are present). Encoder device nodes are not
> affected. Can be reproduced by starting and closing
>
> ffplay -f video4linux2 /dev/video0
>
> [ 8130.281251] ------------[ cut here ]------------
> [ 8130.281256] WARNING: CPU: 1 PID: 20414 at drivers/media/v4l2-core/videobuf2-core.c:1651 __vb2_queue_cancel+0x14b/0x230
> [ 8130.281257] Modules linked in: ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat solo6x10 x86_pkg_temp_thermal vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O)
> [ 8130.281264] CPU: 1 PID: 20414 Comm: ffplay Tainted: G O 4.10.0-gentoo #1
> [ 8130.281264] Hardware name: ASUS All Series/B85M-E, BIOS 2301 03/30/2015
> [ 8130.281265] Call Trace:
> [ 8130.281267] dump_stack+0x4f/0x72
> [ 8130.281270] __warn+0xc7/0xf0
> [ 8130.281271] warn_slowpath_null+0x18/0x20
> [ 8130.281272] __vb2_queue_cancel+0x14b/0x230
> [ 8130.281273] vb2_core_streamoff+0x23/0x90
> [ 8130.281275] vb2_streamoff+0x24/0x50
> [ 8130.281276] vb2_ioctl_streamoff+0x3d/0x50
> [ 8130.281278] v4l_streamoff+0x15/0x20
> [ 8130.281279] __video_do_ioctl+0x25e/0x2f0
> [ 8130.281280] video_usercopy+0x279/0x520
> [ 8130.281282] ? v4l_enum_fmt+0x1330/0x1330
> [ 8130.281285] ? unmap_region+0xdf/0x110
> [ 8130.281285] video_ioctl2+0x10/0x20
> [ 8130.281286] v4l2_ioctl+0xce/0xe0
> [ 8130.281289] do_vfs_ioctl+0x8b/0x5b0
> [ 8130.281290] ? __fget+0x72/0xa0
> [ 8130.281291] SyS_ioctl+0x74/0x80
> [ 8130.281294] entry_SYSCALL_64_fastpath+0x13/0x94
> [ 8130.281295] RIP: 0033:0x7ff86fee6b27
> [ 8130.281296] RSP: 002b:00007ffe467f6a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> [ 8130.281297] RAX: ffffffffffffffda RBX: 00000000d1a4d788 RCX: 00007ff86fee6b27
> [ 8130.281297] RDX: 00007ffe467f6a14 RSI: 0000000040045613 RDI: 0000000000000006
> [ 8130.281298] RBP: 000000000373f8d0 R08: 00000000ffffffff R09: 00007ff860001140
> [ 8130.281298] R10: 0000000000000243 R11: 0000000000000246 R12: 0000000000000000
> [ 8130.281299] R13: 00000000000000a0 R14: 00007ffe467f6530 R15: 0000000001f32228
> [ 8130.281300] ---[ end trace 00695dc96be646e7 ]---
>
> Signed-off-by: Anton Sviridenko <anton@xxxxxxxxxxxxxxxxxxx>
> ---
> drivers/media/pci/solo6x10/solo6x10-v4l2.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/media/pci/solo6x10/solo6x10-v4l2.c b/drivers/media/pci/solo6x10/solo6x10-v4l2.c
> index 896bec6..4163103 100644
> --- a/drivers/media/pci/solo6x10/solo6x10-v4l2.c
> +++ b/drivers/media/pci/solo6x10/solo6x10-v4l2.c
> @@ -341,6 +341,18 @@ static void solo_stop_streaming(struct vb2_queue *q)
> struct solo_dev *solo_dev = vb2_get_drv_priv(q);
>
> solo_stop_thread(solo_dev);
> +
> + spin_lock(&solo_dev->slock);
> + while (!list_empty(&solo_dev->vidq_active)) {
> + struct solo_vb2_buf *buf = list_entry(
> + solo_dev->vidq_active.next,
> + struct solo_vb2_buf, list);
> +
> + list_del(&buf->list);
> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> + dbg_buf_cnt++;
Left-over from debugging? This variable doesn't exist in the mainline code, so
this patch doesn't compile.
Regards,
Hans
> + }
> + spin_unlock(&solo_dev->slock);
> INIT_LIST_HEAD(&solo_dev->vidq_active);
> }
>
>
