[PATCH 5.4 143/475] media: stk1160: If start stream fails, return buffers with VB2_BUF_STATE_QUEUED

From: Greg Kroah-Hartman
Date: Thu Apr 14 2022 - 10:22:39 EST

From: Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>

[ Upstream commit fbe04b49a54e31f4321d632270207f0e6304cd16 ]

If the callback 'start_streaming' fails, then all
queued buffers in the driver should be returned with
state 'VB2_BUF_STATE_QUEUED'. Currently, they are
returned with 'VB2_BUF_STATE_ERROR' which is wrong.
Fix this. This also fixes the warning:

[ 65.583633] WARNING: CPU: 5 PID: 593 at drivers/media/common/videobuf2/videobuf2-core.c:1612 vb2_start_streaming+0xd4/0x160 [videobuf2_common]
[ 65.585027] Modules linked in: snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi snd_soc_hdmi_codec dw_hdmi_i2s_audio saa7115 stk1160 videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc crct10dif_ce panfrost snd_soc_simple_card snd_soc_audio_graph_card snd_soc_spdif_tx snd_soc_simple_card_utils gpu_sched phy_rockchip_pcie snd_soc_rockchip_i2s rockchipdrm analogix_dp dw_mipi_dsi dw_hdmi cec drm_kms_helper drm rtc_rk808 rockchip_saradc industrialio_triggered_buffer kfifo_buf rockchip_thermal pcie_rockchip_host ip_tables x_tables ipv6
[ 65.589383] CPU: 5 PID: 593 Comm: v4l2src0:src Tainted: G W 5.16.0-rc4-62408-g32447129cb30-dirty #14
[ 65.590293] Hardware name: Radxa ROCK Pi 4B (DT)
[ 65.590696] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 65.591304] pc : vb2_start_streaming+0xd4/0x160 [videobuf2_common]
[ 65.591850] lr : vb2_start_streaming+0x6c/0x160 [videobuf2_common]
[ 65.592395] sp : ffff800012bc3ad0
[ 65.592685] x29: ffff800012bc3ad0 x28: 0000000000000000 x27: ffff800012bc3cd8
[ 65.593312] x26: 0000000000000000 x25: ffff00000d8a7800 x24: 0000000040045612
[ 65.593938] x23: ffff800011323000 x22: ffff800012bc3cd8 x21: ffff00000908a8b0
[ 65.594562] x20: ffff00000908a8c8 x19: 00000000fffffff4 x18: ffffffffffffffff
[ 65.595188] x17: 000000040044ffff x16: 00400034b5503510 x15: ffff800011323f78
[ 65.595813] x14: ffff000013163886 x13: ffff000013163885 x12: 00000000000002ce
[ 65.596439] x11: 0000000000000028 x10: 0000000000000001 x9 : 0000000000000228
[ 65.597064] x8 : 0101010101010101 x7 : 7f7f7f7f7f7f7f7f x6 : fefefeff726c5e78
[ 65.597690] x5 : ffff800012bc3990 x4 : 0000000000000000 x3 : ffff000009a34880
[ 65.598315] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000007cd99f0
[ 65.598940] Call trace:
[ 65.599155] vb2_start_streaming+0xd4/0x160 [videobuf2_common]
[ 65.599672] vb2_core_streamon+0x17c/0x1a8 [videobuf2_common]
[ 65.600179] vb2_streamon+0x54/0x88 [videobuf2_v4l2]
[ 65.600619] vb2_ioctl_streamon+0x54/0x60 [videobuf2_v4l2]
[ 65.601103] v4l_streamon+0x3c/0x50 [videodev]
[ 65.601521] __video_do_ioctl+0x1a4/0x428 [videodev]
[ 65.601977] video_usercopy+0x320/0x828 [videodev]
[ 65.602419] video_ioctl2+0x3c/0x58 [videodev]
[ 65.602830] v4l2_ioctl+0x60/0x90 [videodev]
[ 65.603227] __arm64_sys_ioctl+0xa8/0xe0
[ 65.603576] invoke_syscall+0x54/0x118
[ 65.603911] el0_svc_common.constprop.3+0x84/0x100
[ 65.604332] do_el0_svc+0x34/0xa0
[ 65.604625] el0_svc+0x1c/0x50
[ 65.604897] el0t_64_sync_handler+0x88/0xb0
[ 65.605264] el0t_64_sync+0x16c/0x170
[ 65.605587] ---[ end trace 578e0ba07742170d ]---

Fixes: 8ac456495a33d ("[media] stk1160: Stop device and unqueue buffers when start_streaming() fails")
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>
Reviewed-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/media/usb/stk1160/stk1160-core.c | 2 +-
drivers/media/usb/stk1160/stk1160-v4l.c | 10 +++++-----
drivers/media/usb/stk1160/stk1160.h | 2 +-
3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/stk1160/stk1160-core.c b/drivers/media/usb/stk1160/stk1160-core.c
index 4e1698f78818..ce717502ea4c 100644
--- a/drivers/media/usb/stk1160/stk1160-core.c
+++ b/drivers/media/usb/stk1160/stk1160-core.c
@@ -403,7 +403,7 @@ static void stk1160_disconnect(struct usb_interface *interface)
/* Here is the only place where isoc get released */
stk1160_uninit_isoc(dev);

- stk1160_clear_queue(dev);
+ stk1160_clear_queue(dev, VB2_BUF_STATE_ERROR);

video_unregister_device(&dev->vdev);
v4l2_device_disconnect(&dev->v4l2_dev);
diff --git a/drivers/media/usb/stk1160/stk1160-v4l.c b/drivers/media/usb/stk1160/stk1160-v4l.c
index bcd14c66e8df..a307807571ab 100644
--- a/drivers/media/usb/stk1160/stk1160-v4l.c
+++ b/drivers/media/usb/stk1160/stk1160-v4l.c
@@ -258,7 +258,7 @@ static int stk1160_start_streaming(struct stk1160 *dev)
stk1160_uninit_isoc(dev);
out_stop_hw:
usb_set_interface(dev->udev, 0, 0);
- stk1160_clear_queue(dev);
+ stk1160_clear_queue(dev, VB2_BUF_STATE_QUEUED);

mutex_unlock(&dev->v4l_lock);

@@ -306,7 +306,7 @@ static int stk1160_stop_streaming(struct stk1160 *dev)

stk1160_stop_hw(dev);

- stk1160_clear_queue(dev);
+ stk1160_clear_queue(dev, VB2_BUF_STATE_ERROR);

stk1160_dbg("streaming stopped\n");

@@ -745,7 +745,7 @@ static const struct video_device v4l_template = {
/********************************************************************/

/* Must be called with both v4l_lock and vb_queue_lock hold */
-void stk1160_clear_queue(struct stk1160 *dev)
+void stk1160_clear_queue(struct stk1160 *dev, enum vb2_buffer_state vb2_state)
{
struct stk1160_buffer *buf;
unsigned long flags;
@@ -756,7 +756,7 @@ void stk1160_clear_queue(struct stk1160 *dev)
buf = list_first_entry(&dev->avail_bufs,
struct stk1160_buffer, list);
list_del(&buf->list);
- vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ vb2_buffer_done(&buf->vb.vb2_buf, vb2_state);
stk1160_dbg("buffer [%p/%d] aborted\n",
buf, buf->vb.vb2_buf.index);
}
@@ -766,7 +766,7 @@ void stk1160_clear_queue(struct stk1160 *dev)
buf = dev->isoc_ctl.buf;
dev->isoc_ctl.buf = NULL;

- vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ vb2_buffer_done(&buf->vb.vb2_buf, vb2_state);
stk1160_dbg("buffer [%p/%d] aborted\n",
buf, buf->vb.vb2_buf.index);
}
diff --git a/drivers/media/usb/stk1160/stk1160.h b/drivers/media/usb/stk1160/stk1160.h
index a31ea1c80f25..a70963ce8753 100644
--- a/drivers/media/usb/stk1160/stk1160.h
+++ b/drivers/media/usb/stk1160/stk1160.h
@@ -166,7 +166,7 @@ struct regval {
int stk1160_vb2_setup(struct stk1160 *dev);
int stk1160_video_register(struct stk1160 *dev);
void stk1160_video_unregister(struct stk1160 *dev);
-void stk1160_clear_queue(struct stk1160 *dev);
+void stk1160_clear_queue(struct stk1160 *dev, enum vb2_buffer_state vb2_state);

/* Provided by stk1160-video.c */
int stk1160_alloc_isoc(struct stk1160 *dev);
--
2.34.1