Hello Shuah,
This patch seems to cause issues with my setup. Basically, when I try
to tune to a channel, I get an oops. I'm using TechnoTrend CT2-4650
PCIe DVB-T tuner (cx23885).
Here's the oops:
[ 548.443272] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000010
[ 548.452036] IP: [<ffffffffc020ffc9>]
v4l_vb2q_enable_media_source+0x9/0x50 [videodev]
[ 548.460792] PGD b820e067 PUD bb3df067 PMD 0
[ 548.465582] Oops: 0000 [#1] SMP
[ 548.469199] Modules linked in: sp2(OE) si2157(OE) si2168(OE)
cx25840(OE) cx23885(OE) altera_ci(OE) tda18271(OE) altera_stapl(OE)
videobuf2_dvb(OE) m88ds3103(OE) tveeprom(OE) cx2341x(OE) dvb_core(OE)
rc_core(OE) videobuf2_dma_sg(OE) videobuf2_memops(OE)
frame_vector(POE) v4l2_common(OE) videobuf2_v4l2(OE)
videobuf2_core(OE) videodev(OE) media(OE) i2c_mux snd_pcm snd_timer
snd soundcore des_generic md4 nls_utf8 cifs fscache ipmi_ssif
intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel gpio_ich aesni_intel aes_x86_64 lrw gf128mul
glue_helper ablk_helper cryptd serio_raw i7core_edac ipmi_si edac_core
shpchp ipmi_msghandler tpm_infineon lpc_ich lp 8250_fintek mac_hid
parport igb i2c_algo_bit dca ahci ptp libahci pps_core [last unloaded:
tveeprom]
[ 548.546864] CPU: 12 PID: 18651 Comm: dvbv5-scan Tainted: P
IOE 4.1.7-040107-generic #201509131330
[ 548.557833] Hardware name: HP ProLiant DL160 G6 , BIOS O33 07/01/2013
[ 548.565117] task: ffff880239c9b250 ti: ffff88013a738000 task.ti:
ffff88013a738000
[ 548.573466] RIP: 0010:[<ffffffffc020ffc9>] [<ffffffffc020ffc9>]
v4l_vb2q_enable_media_source+0x9/0x50 [videodev]
[ 548.584936] RSP: 0018:ffff88013a73bba0 EFLAGS: 00010287
[ 548.590862] RAX: 0000000000000000 RBX: ffff88023a55e828 RCX: ffff88023a55e9b0
[ 548.598824] RDX: 0000000000000002 RSI: 0000000000000001 RDI: ffff88023a55e828
[ 548.606788] RBP: ffff88013a73bbc8 R08: 00000000000002f0 R09: 0000000000000000
[ 548.614751] R10: ffffffff81ab5eb7 R11: ffffea0000dad080 R12: ffff88013a7c7000
[ 548.622712] R13: 0000000000000000 R14: ffff88023a55e9a8 R15: 0000000000000020
[ 548.630675] FS: 00007fe55f94d740(0000) GS:ffff88013bb80000(0000)
knlGS:0000000000000000
[ 548.639704] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 548.646114] CR2: 0000000000000010 CR3: 00000000baa41000 CR4: 00000000000006e0
[ 548.654076] Stack:
[ 548.656318] ffffffffc01caf15 ffff88013a7c7000 0000000000000000
ffff88023a55e9a8
[ 548.664610] ffff88023a55e828 ffff88013a73bc18 ffffffffc01cce13
ffffffffc01cd689
[ 548.672902] 0000002000000001 8000000000000163 ffff88023a55e828
ffffffffc01f2220
[ 548.681194] Call Trace:
[ 548.683926] [<ffffffffc01caf15>] ? vb2_core_streamon+0x125/0x170
[videobuf2_core]
[ 548.692376] [<ffffffffc01cce13>] __vb2_init_fileio+0x273/0x2f0
[videobuf2_core]
[ 548.700631] [<ffffffffc01cd689>] ? vb2_thread_start+0x69/0x9e0
[videobuf2_core]
[ 548.708886] [<ffffffffc01f2220>] ? vb2_dvb_start_feed+0xc0/0xc0
[videobuf2_dvb]
[ 548.717141] [<ffffffffc01cd6b6>] vb2_thread_start+0x96/0x9e0
[videobuf2_core]
[ 548.725204] [<ffffffff811bea35>] ? map_vm_area+0x35/0x40
[ 548.731228] [<ffffffffc01f21e8>] vb2_dvb_start_feed+0x88/0xc0
[videobuf2_dvb]
[ 548.739290] [<ffffffffc03548c1>]
dmx_section_feed_start_filtering+0xe1/0x1b0 [dvb_core]
[ 548.748322] [<ffffffffc03532fe>]
dvb_dmxdev_filter_start+0x20e/0x470 [dvb_core]
[ 548.756578] [<ffffffffc0353803>] dvb_demux_do_ioctl+0x2a3/0x700 [dvb_core]
[ 548.764349] [<ffffffffc0351625>] dvb_usercopy+0x115/0x190 [dvb_core]
[ 548.771539] [<ffffffff810b11e4>] ? update_curr+0xe4/0x180
[ 548.777663] [<ffffffffc0353560>] ?
dvb_dmxdev_filter_start+0x470/0x470 [dvb_core]
[ 548.786112] [<ffffffff810af509>] ? pick_next_entity+0xa9/0x190
[ 548.792716] [<ffffffff810b6c1b>] ? pick_next_task_fair+0x65b/0x910
[ 548.799710] [<ffffffffc0351975>] dvb_demux_ioctl+0x15/0x20 [dvb_core]
[ 548.806994] [<ffffffff8120ce68>] do_vfs_ioctl+0x2f8/0x510
[ 548.813117] [<ffffffff817d44e6>] ? __schedule+0x386/0x9a0
[ 548.819237] [<ffffffff8120d101>] SyS_ioctl+0x81/0xa0
[ 548.824872] [<ffffffff817d4b37>] ? schedule+0x37/0x90
[ 548.830608] [<ffffffff810159bb>] ? math_state_restore+0xdb/0x1d0
[ 548.837401] [<ffffffff817d8ab2>] system_call_fastpath+0x16/0x75
[ 548.844103] Code: 8b 80 c8 05 00 00 48 85 c0 74 07 55 48 89 e5 ff
d0 5d f3 c3 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90
48 8b 47 18 <48> 8b 78 10 48 8b 07 48 85 c0 74 2b 48 8b 90 c0 05 00 00
31 c0
[ 548.865851] RIP [<ffffffffc020ffc9>]
v4l_vb2q_enable_media_source+0x9/0x50 [videodev]
[ 548.874704] RSP <ffff88013a73bba0>
[ 548.878593] CR2: 0000000000000010
[ 548.882304] ---[ end trace 38ce56384a5e39e2 ]---
Here's the git bisect result:
77fa4e072998705883c4dc672963b4bf7483cea9 is the first bad commit
commit 77fa4e072998705883c4dc672963b4bf7483cea9
Author: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Date: Thu Feb 11 21:41:29 2016 -0200
[media] media: Change v4l-core to check if source is free
Change s_input, s_fmt, s_tuner, s_frequency, querystd, s_hw_freq_seek,
and vb2_core_streamon interfaces that alter the tuner configuration to
check if it is free, by calling v4l_enable_media_source().
If source isn't free, return -EBUSY.
v4l_disable_media_source() is called from v4l2_fh_exit() to release
tuner (source).
vb2_core_streamon() uses v4l_vb2q_enable_media_source().
Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
:040000 040000 853ab8842fcbd6c3add680cedff54b1c352d4768
990ddc77b888d935d969859c087e581307365ed8 M drivers
After reverting this single patch, the tuner worked normally again.
Cheers,
-olli
On 12 February 2016 at 01:41, Shuah Khan <shuahkh@xxxxxxxxxxxxxxx> wrote:
> Change s_input, s_fmt, s_tuner, s_frequency, querystd,
> s_hw_freq_seek, and vb2_core_streamon interfaces that
> alter the tuner configuration to check if it is free,
> by calling v4l_enable_media_source(). If source isn't
> free, return -EBUSY. v4l_disable_media_source() is
> called from v4l2_fh_exit() to release tuner (source).
> vb2_core_streamon() uses v4l_vb2q_enable_media_source().
>
> Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-fh.c | 2 ++
> drivers/media/v4l2-core/v4l2-ioctl.c | 30 ++++++++++++++++++++++++++++++
> drivers/media/v4l2-core/videobuf2-core.c | 4 ++++
> 3 files changed, 36 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-fh.c b/drivers/media/v4l2-core/v4l2-fh.c
> index c97067a..c183f09 100644
> --- a/drivers/media/v4l2-core/v4l2-fh.c
> +++ b/drivers/media/v4l2-core/v4l2-fh.c
> @@ -29,6 +29,7 @@
> #include <media/v4l2-fh.h>
> #include <media/v4l2-event.h>
> #include <media/v4l2-ioctl.h>
> +#include <media/v4l2-mc.h>
>
> void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev)
> {
> @@ -92,6 +93,7 @@ void v4l2_fh_exit(struct v4l2_fh *fh)
> {
> if (fh->vdev == NULL)
> return;
> + v4l_disable_media_source(fh->vdev);
> v4l2_event_unsubscribe_all(fh);
> fh->vdev = NULL;
> }
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 8a018c6..ceaa44a 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -27,6 +27,7 @@
> #include <media/v4l2-event.h>
> #include <media/v4l2-device.h>
> #include <media/videobuf2-v4l2.h>
> +#include <media/v4l2-mc.h>
>
> #include <trace/events/v4l2.h>
>
> @@ -1041,6 +1042,12 @@ static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
> static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
> struct file *file, void *fh, void *arg)
> {
> + struct video_device *vfd = video_devdata(file);
> + int ret;
> +
> + ret = v4l_enable_media_source(vfd);
> + if (ret)
> + return ret;
> return ops->vidioc_s_input(file, fh, *(unsigned int *)arg);
> }
>
> @@ -1448,6 +1455,9 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
> bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
> int ret;
>
> + ret = v4l_enable_media_source(vfd);
> + if (ret)
> + return ret;
> v4l_sanitize_format(p);
>
> switch (p->type) {
> @@ -1637,7 +1647,11 @@ static int v4l_s_tuner(const struct v4l2_ioctl_ops *ops,
> {
> struct video_device *vfd = video_devdata(file);
> struct v4l2_tuner *p = arg;
> + int ret;
>
> + ret = v4l_enable_media_source(vfd);
> + if (ret)
> + return ret;
> p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
> V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
> return ops->vidioc_s_tuner(file, fh, p);
> @@ -1691,7 +1705,11 @@ static int v4l_s_frequency(const struct v4l2_ioctl_ops *ops,
> struct video_device *vfd = video_devdata(file);
> const struct v4l2_frequency *p = arg;
> enum v4l2_tuner_type type;
> + int ret;
>
> + ret = v4l_enable_media_source(vfd);
> + if (ret)
> + return ret;
> if (vfd->vfl_type == VFL_TYPE_SDR) {
> if (p->type != V4L2_TUNER_SDR && p->type != V4L2_TUNER_RF)
> return -EINVAL;
> @@ -1746,7 +1764,11 @@ static int v4l_s_std(const struct v4l2_ioctl_ops *ops,
> {
> struct video_device *vfd = video_devdata(file);
> v4l2_std_id id = *(v4l2_std_id *)arg, norm;
> + int ret;
>
> + ret = v4l_enable_media_source(vfd);
> + if (ret)
> + return ret;
> norm = id & vfd->tvnorms;
> if (vfd->tvnorms && !norm) /* Check if std is supported */
> return -EINVAL;
> @@ -1760,7 +1782,11 @@ static int v4l_querystd(const struct v4l2_ioctl_ops *ops,
> {
> struct video_device *vfd = video_devdata(file);
> v4l2_std_id *p = arg;
> + int ret;
>
> + ret = v4l_enable_media_source(vfd);
> + if (ret)
> + return ret;
> /*
> * If no signal is detected, then the driver should return
> * V4L2_STD_UNKNOWN. Otherwise it should return tvnorms with
> @@ -1779,7 +1805,11 @@ static int v4l_s_hw_freq_seek(const struct v4l2_ioctl_ops *ops,
> struct video_device *vfd = video_devdata(file);
> struct v4l2_hw_freq_seek *p = arg;
> enum v4l2_tuner_type type;
> + int ret;
>
> + ret = v4l_enable_media_source(vfd);
> + if (ret)
> + return ret;
> /* s_hw_freq_seek is not supported for SDR for now */
> if (vfd->vfl_type == VFL_TYPE_SDR)
> return -EINVAL;
> diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
> index ec5b78e..d381478 100644
> --- a/drivers/media/v4l2-core/videobuf2-core.c
> +++ b/drivers/media/v4l2-core/videobuf2-core.c
> @@ -25,6 +25,7 @@
> #include <linux/kthread.h>
>
> #include <media/videobuf2-core.h>
> +#include <media/v4l2-mc.h>
>
> #include <trace/events/vb2.h>
>
> @@ -1873,6 +1874,9 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int type)
> * are available.
> */
> if (q->queued_count >= q->min_buffers_needed) {
> + ret = v4l_vb2q_enable_media_source(q);
> + if (ret)
> + return ret;
> ret = vb2_start_streaming(q);
> if (ret) {
> __vb2_queue_cancel(q);
> --
> 2.5.0
>
> --
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