[media] pwc-if: must check vb2_queue_init() success
drivers/media/usb/pwc/pwc-if.c: In function 'usb_pwc_probe':
drivers/media/usb/pwc/pwc-if.c:1003:16: warning: ignoring return value of 'vb2_queue_init', declared with attribute warn_unused_result [-Wunused-result]
In the past, it used to have a logic there at queue init that would
BUG() on errors. This logic got removed. Drivers are now required
to explicitly handle the queue initialization errors, or very bad
things may happen.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c
index e191572..5210239 100644
--- a/drivers/media/usb/pwc/pwc-if.c
+++ b/drivers/media/usb/pwc/pwc-if.c
@@ -1000,7 +1000,11 @@
pdev->vb_queue.buf_struct_size = sizeof(struct pwc_frame_buf);
pdev->vb_queue.ops = &pwc_vb_queue_ops;
pdev->vb_queue.mem_ops = &vb2_vmalloc_memops;
- vb2_queue_init(&pdev->vb_queue);
+ rc = vb2_queue_init(&pdev->vb_queue);
+ if (rc < 0) {
+ PWC_ERROR("Oops, could not initialize vb2 queue.\n");
+ goto err_free_mem;
+ }
/* Init video_device structure */
memcpy(&pdev->vdev, &pwc_template, sizeof(pwc_template));