* [PATCH] staging: vchiq: Fix refcounting bug in buffer_from_host()
@ 2020-07-22 13:06 Dan Carpenter
0 siblings, 0 replies; only message in thread
From: Dan Carpenter @ 2020-07-22 13:06 UTC (permalink / raw)
To: Nicolas Saenz Julienne, Dave Stevenson
Cc: Greg Kroah-Hartman, Jacopo Mondi, Jamal Shareef,
Mauro Carvalho Chehab, Stefan Wahren, Hans Verkuil,
bcm-kernel-feedback-list, linux-rpi-kernel, devel, linux-kernel,
kernel-janitors
If we fail to queue the buffer then it can never be dequeued. This can
lead to a forever loop in stop_streaming() when we wait for everything
to finish.
Fixes: 70ec64ccdaac ("staging: bcm2835-camera: Ensure all buffers are returned on disable")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
From static analysis. Not tested. Please review carefully etc.
drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
index dc767730db43..65dd2a55b3da 100644
--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
@@ -441,6 +441,8 @@ buffer_from_host(struct vchiq_mmal_instance *instance,
ret = vchiq_queue_kernel_message(instance->service_handle, &m,
sizeof(struct mmal_msg_header) +
sizeof(m.u.buffer_from_host));
+ if (ret)
+ atomic_dec(&port->buffers_with_vpu);
vchiq_release_service(instance->service_handle);
--
2.27.0
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