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* [PATCH AUTOSEL 5.15 01/24] media: v4l2-mem2mem: add lock to protect parameter num_rdy
@ 2023-07-24  1:33 Sasha Levin
  2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 02/24] media: camss: set VFE bpl_alignment to 16 for sdm845 and sm8250 Sasha Levin
                   ` (22 more replies)
  0 siblings, 23 replies; 24+ messages in thread
From: Sasha Levin @ 2023-07-24  1:33 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Yunfei Dong, Pina Chen, Hans Verkuil, Sasha Levin, matthias.bgg,
	linux-media, linux-arm-kernel, linux-mediatek

From: Yunfei Dong <yunfei.dong@mediatek.com>

[ Upstream commit 56b5c3e67b0f9af3f45cf393be048ee8d8a92694 ]

Getting below error when using KCSAN to check the driver. Adding lock to
protect parameter num_rdy when getting the value with function:
v4l2_m2m_num_src_bufs_ready/v4l2_m2m_num_dst_bufs_ready.

kworker/u16:3: [name:report&]BUG: KCSAN: data-race in v4l2_m2m_buf_queue
kworker/u16:3: [name:report&]

kworker/u16:3: [name:report&]read-write to 0xffffff8105f35b94 of 1 bytes by task 20865 on cpu 7:
kworker/u16:3:  v4l2_m2m_buf_queue+0xd8/0x10c

Signed-off-by: Pina Chen <pina.chen@mediatek.com>
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/media/v4l2-mem2mem.h | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index 5a91b548ecc0c..8d52c4506762d 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -588,7 +588,14 @@ void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
 static inline
 unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 {
-	return m2m_ctx->out_q_ctx.num_rdy;
+	unsigned int num_buf_rdy;
+	unsigned long flags;
+
+	spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags);
+	num_buf_rdy = m2m_ctx->out_q_ctx.num_rdy;
+	spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags);
+
+	return num_buf_rdy;
 }
 
 /**
@@ -600,7 +607,14 @@ unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 static inline
 unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 {
-	return m2m_ctx->cap_q_ctx.num_rdy;
+	unsigned int num_buf_rdy;
+	unsigned long flags;
+
+	spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags);
+	num_buf_rdy = m2m_ctx->cap_q_ctx.num_rdy;
+	spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags);
+
+	return num_buf_rdy;
 }
 
 /**
-- 
2.39.2


^ permalink raw reply	[flat|nested] 24+ messages in thread

end of thread, other threads:[~2023-07-24  1:46 UTC | newest]

Thread overview: 24+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-07-24  1:33 [PATCH AUTOSEL 5.15 01/24] media: v4l2-mem2mem: add lock to protect parameter num_rdy Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 02/24] media: camss: set VFE bpl_alignment to 16 for sdm845 and sm8250 Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 03/24] usb: gadget: u_serial: Avoid spinlock recursion in __gs_console_push Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 04/24] media: platform: mediatek: vpu: fix NULL ptr dereference Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 05/24] thunderbolt: Read retimer NVM authentication status prior tb_retimer_set_inbound_sbtx() Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 06/24] xhci: Don't require a valid get_quirks() function pointer during xhci setup Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 07/24] usb: chipidea: imx: don't request QoS for imx8ulp Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 08/24] usb: cdns2: Device side header file for CDNS2 driver Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 09/24] usb: chipidea: imx: add missing USB PHY DPDM wakeup setting Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 10/24] gfs2: Fix possible data races in gfs2_show_options() Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 11/24] pcmcia: rsrc_nonstatic: Fix memory leak in nonstatic_release_resource_db() Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 12/24] firewire: net: fix use after free in fwnet_finish_incoming_packet() Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 13/24] watchdog: sp5100_tco: support Hygon FCH/SCH (Server Controller Hub) Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 14/24] Bluetooth: L2CAP: Fix use-after-free Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 15/24] Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_ready_cb Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 16/24] Bluetooth: btusb: Add MT7922 bluetooth ID for the Asus Ally Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 17/24] drm/amdgpu: Fix potential fence use-after-free v2 Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 18/24] fs/ntfs3: Enhance sanity check while generating attr_list Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 19/24] fs: ntfs3: Fix possible null-pointer dereferences in mi_read() Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 20/24] fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_load_attr_list() Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 21/24] fs/ntfs3: Mark ntfs dirty when on-disk struct is corrupted Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 22/24] ALSA: hda/realtek: Add quirks for Unis H3C Desktop B760 & Q760 Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 23/24] ALSA: hda: fix a possible null-pointer dereference due to data race in snd_hdac_regmap_sync() Sasha Levin
2023-07-24  1:33 ` [PATCH AUTOSEL 5.15 24/24] apparmor: fix use of strcpy in policy_unpack_test Sasha Levin

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