V4L/DVB (8208): uvcvideo: Use GFP_NOIO when allocating memory during resume

The swap device might still be asleep, so memory allocated in the resume
handler must use GFP_NOIO. Thanks to Oliver Neukum for catching and reporting
this bug.

Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/uvc/uvc_status.c b/drivers/media/video/uvc/uvc_status.c
index be9084e..06b4798 100644 (file)
--- a/drivers/media/video/uvc/uvc_status.c
+++ b/drivers/media/video/uvc/uvc_status.c
@@ -203,5 +203,5 @@ int uvc_status_resume(struct uvc_device *dev)
        if (dev->int_urb == NULL)
                return 0;
 
-       return usb_submit_urb(dev->int_urb, GFP_KERNEL);
+       return usb_submit_urb(dev->int_urb, GFP_NOIO);
 }

diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index 6faf1fb..8eb5748 100644 (file)
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -586,7 +586,7 @@ static void uvc_uninit_video(struct uvc_video_device *video)
  * is given by the endpoint.
  */
 static int uvc_init_video_isoc(struct uvc_video_device *video,
-       struct usb_host_endpoint *ep)
+       struct usb_host_endpoint *ep, gfp_t gfp_flags)
 {
        struct urb *urb;
        unsigned int npackets, i, j;
@@ -611,14 +611,14 @@ static int uvc_init_video_isoc(struct uvc_video_device *video,
        size = npackets * psize;
 
        for (i = 0; i < UVC_URBS; ++i) {
-               urb = usb_alloc_urb(npackets, GFP_KERNEL);
+               urb = usb_alloc_urb(npackets, gfp_flags);
                if (urb == NULL) {
                        uvc_uninit_video(video);
                        return -ENOMEM;
                }
 
                video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev,
-                       size, GFP_KERNEL, &urb->transfer_dma);
+                       size, gfp_flags, &urb->transfer_dma);
                if (video->urb_buffer[i] == NULL) {
                        usb_free_urb(urb);
                        uvc_uninit_video(video);
@@ -652,7 +652,7 @@ static int uvc_init_video_isoc(struct uvc_video_device *video,
  * given by the endpoint.
  */
 static int uvc_init_video_bulk(struct uvc_video_device *video,
-       struct usb_host_endpoint *ep)
+       struct usb_host_endpoint *ep, gfp_t gfp_flags)
 {
        struct urb *urb;
        unsigned int pipe, i;
@@ -674,14 +674,14 @@ static int uvc_init_video_bulk(struct uvc_video_device *video,
        pipe = usb_rcvbulkpipe(video->dev->udev, ep->desc.bEndpointAddress);
 
        for (i = 0; i < UVC_URBS; ++i) {
-               urb = usb_alloc_urb(0, GFP_KERNEL);
+               urb = usb_alloc_urb(0, gfp_flags);
                if (urb == NULL) {
                        uvc_uninit_video(video);
                        return -ENOMEM;
                }
 
                video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev,
-                       size, GFP_KERNEL, &urb->transfer_dma);
+                       size, gfp_flags, &urb->transfer_dma);
                if (video->urb_buffer[i] == NULL) {
                        usb_free_urb(urb);
                        uvc_uninit_video(video);
@@ -702,7 +702,7 @@ static int uvc_init_video_bulk(struct uvc_video_device *video,
 /*
  * Initialize isochronous/bulk URBs and allocate transfer buffers.
  */
-static int uvc_init_video(struct uvc_video_device *video)
+static int uvc_init_video(struct uvc_video_device *video, gfp_t gfp_flags)
 {
        struct usb_interface *intf = video->streaming->intf;
        struct usb_host_interface *alts;
@@ -747,7 +747,7 @@ static int uvc_init_video(struct uvc_video_device *video)
                if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0)
                        return ret;
 
-               ret = uvc_init_video_isoc(video, ep);
+               ret = uvc_init_video_isoc(video, ep, gfp_flags);
        } else {
                /* Bulk endpoint, proceed to URB initialization. */
                ep = uvc_find_endpoint(&intf->altsetting[0],
@@ -755,7 +755,7 @@ static int uvc_init_video(struct uvc_video_device *video)
                if (ep == NULL)
                        return -EIO;
 
-               ret = uvc_init_video_bulk(video, ep);
+               ret = uvc_init_video_bulk(video, ep, gfp_flags);
        }
 
        if (ret < 0)
@@ -763,7 +763,7 @@ static int uvc_init_video(struct uvc_video_device *video)
 
        /* Submit the URBs. */
        for (i = 0; i < UVC_URBS; ++i) {
-               if ((ret = usb_submit_urb(video->urb[i], GFP_KERNEL)) < 0) {
+               if ((ret = usb_submit_urb(video->urb[i], gfp_flags)) < 0) {
                        uvc_printk(KERN_ERR, "Failed to submit URB %u "
                                        "(%d).\n", i, ret);
                        uvc_uninit_video(video);
@@ -818,7 +818,7 @@ int uvc_video_resume(struct uvc_video_device *video)
        if (!uvc_queue_streaming(&video->queue))
                return 0;
 
-       if ((ret = uvc_init_video(video)) < 0)
+       if ((ret = uvc_init_video(video, GFP_NOIO)) < 0)
                uvc_queue_enable(&video->queue, 0);
 
        return ret;
@@ -930,5 +930,5 @@ int uvc_video_enable(struct uvc_video_device *video, int enable)
        if ((ret = uvc_queue_enable(&video->queue, 1)) < 0)
                return ret;
 
-       return uvc_init_video(video);
+       return uvc_init_video(video, GFP_KERNEL);
 }