linux-kernel - [ 13/61] media: pwc-if: must check vb2_queue

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Date:	Tue, 12 Feb 2013 12:34:33 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mauro Carvalho Chehab <mchehab@...hat.com>,
	Paul Bolle <pebolle@...cali.nl>
Subject: [ 13/61] media: pwc-if: must check vb2_queue_init() success

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mauro Carvalho Chehab <mchehab@...hat.com>

commit eda94710d6502672c5ee7de198fa78a63ddfae3a upstream.

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@...hat.com>
Signed-off-by: Paul Bolle <pebolle@...cali.nl>

---
 drivers/media/usb/pwc/pwc-if.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/media/usb/pwc/pwc-if.c
+++ b/drivers/media/usb/pwc/pwc-if.c
@@ -1000,7 +1000,11 @@ static int usb_pwc_probe(struct usb_inte
 	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));


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