[media] pwc: properly allocate dma-able memory for ISO buffers

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c
index a6b5fde..4c1c056 100644 (file)
--- a/drivers/media/video/pwc/pwc-if.c
+++ b/drivers/media/video/pwc/pwc-if.c
@@ -376,7 +376,6 @@ static int pwc_isoc_init(struct pwc_device *pdev)
        int i, j, ret;
        struct usb_interface *intf;
        struct usb_host_interface *idesc = NULL;
-       void *kbuf;
 
        if (pdev->iso_init)
                return 0;
@@ -416,20 +415,7 @@ static int pwc_isoc_init(struct pwc_device *pdev)
        if (ret < 0)
                return ret;
 
-       /* Allocate Isochronuous pipe buffers */
-       for (i = 0; i < MAX_ISO_BUFS; i++) {
-               kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
-               if (kbuf == NULL) {
-                       PWC_ERROR("Failed to allocate iso buffer %d.\n", i);
-                       pdev->iso_init = 1;
-                       pwc_isoc_cleanup(pdev);
-                       return -ENOMEM;
-               }
-               PWC_DEBUG_MEMORY("Allocated iso buffer at %p.\n", kbuf);
-               pdev->sbuf[i].data = kbuf;
-       }
-
-       /* Allocate Isochronuous urbs */
+       /* Allocate and init Isochronuous urbs */
        for (i = 0; i < MAX_ISO_BUFS; i++) {
                urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
                if (urb == NULL) {
@@ -438,19 +424,23 @@ static int pwc_isoc_init(struct pwc_device *pdev)
                        pwc_isoc_cleanup(pdev);
                        return -ENOMEM;
                }
-               pdev->sbuf[i].urb = urb;
+               pdev->urbs[i] = urb;
                PWC_DEBUG_MEMORY("Allocated URB at 0x%p\n", urb);
-       }
-
-       /* init URB structure */
-       for (i = 0; i < MAX_ISO_BUFS; i++) {
-               urb = pdev->sbuf[i].urb;
 
                urb->interval = 1; // devik
                urb->dev = udev;
                urb->pipe = usb_rcvisocpipe(udev, pdev->vendpoint);
-               urb->transfer_flags = URB_ISO_ASAP;
-               urb->transfer_buffer = pdev->sbuf[i].data;
+               urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+               urb->transfer_buffer = usb_alloc_coherent(udev,
+                                                         ISO_BUFFER_SIZE,
+                                                         GFP_KERNEL,
+                                                         &urb->transfer_dma);
+               if (urb->transfer_buffer == NULL) {
+                       PWC_ERROR("Failed to allocate urb buffer %d\n", i);
+                       pdev->iso_init = 1;
+                       pwc_isoc_cleanup(pdev);
+                       return -ENOMEM;
+               }
                urb->transfer_buffer_length = ISO_BUFFER_SIZE;
                urb->complete = pwc_isoc_handler;
                urb->context = pdev;
@@ -464,14 +454,14 @@ static int pwc_isoc_init(struct pwc_device *pdev)
 
        /* link */
        for (i = 0; i < MAX_ISO_BUFS; i++) {
-               ret = usb_submit_urb(pdev->sbuf[i].urb, GFP_KERNEL);
+               ret = usb_submit_urb(pdev->urbs[i], GFP_KERNEL);
                if (ret) {
                        PWC_ERROR("isoc_init() submit_urb %d failed with error %d\n", i, ret);
                        pdev->iso_init = 1;
                        pwc_isoc_cleanup(pdev);
                        return ret;
                }
-               PWC_DEBUG_MEMORY("URB 0x%p submitted.\n", pdev->sbuf[i].urb);
+               PWC_DEBUG_MEMORY("URB 0x%p submitted.\n", pdev->urbs[i]);
        }
 
        /* All is done... */
@@ -486,12 +476,9 @@ static void pwc_iso_stop(struct pwc_device *pdev)
 
        /* Unlinking ISOC buffers one by one */
        for (i = 0; i < MAX_ISO_BUFS; i++) {
-               struct urb *urb;
-
-               urb = pdev->sbuf[i].urb;
-               if (urb) {
-                       PWC_DEBUG_MEMORY("Unlinking URB %p\n", urb);
-                       usb_kill_urb(urb);
+               if (pdev->urbs[i]) {
+                       PWC_DEBUG_MEMORY("Unlinking URB %p\n", pdev->urbs[i]);
+                       usb_kill_urb(pdev->urbs[i]);
                }
        }
 }
@@ -502,21 +489,22 @@ static void pwc_iso_free(struct pwc_device *pdev)
 
        /* Freeing ISOC buffers one by one */
        for (i = 0; i < MAX_ISO_BUFS; i++) {
-               struct urb *urb;
-
-               urb = pdev->sbuf[i].urb;
-               if (urb) {
+               if (pdev->urbs[i]) {
                        PWC_DEBUG_MEMORY("Freeing URB\n");
-                       usb_free_urb(urb);
-                       pdev->sbuf[i].urb = NULL;
+                       if (pdev->urbs[i]->transfer_buffer) {
+                               usb_free_coherent(pdev->udev,
+                                       pdev->urbs[i]->transfer_buffer_length,
+                                       pdev->urbs[i]->transfer_buffer,
+                                       pdev->urbs[i]->transfer_dma);
+                       }
+                       usb_free_urb(pdev->urbs[i]);
+                       pdev->urbs[i] = NULL;
                }
        }
 }
 
 static void pwc_isoc_cleanup(struct pwc_device *pdev)
 {
-       int i;
-
        PWC_DEBUG_OPEN(">> pwc_isoc_cleanup()\n");
 
        if (pdev->iso_init == 0)
@@ -526,16 +514,6 @@ static void pwc_isoc_cleanup(struct pwc_device *pdev)
        pwc_iso_free(pdev);
        usb_set_interface(pdev->udev, 0, 0);
 
-       /* Release Iso-pipe buffers */
-       for (i = 0; i < MAX_ISO_BUFS; i++) {
-               if (pdev->sbuf[i].data != NULL) {
-                       PWC_DEBUG_MEMORY("Freeing ISO buffer at %p.\n",
-                                        pdev->sbuf[i].data);
-                       kfree(pdev->sbuf[i].data);
-                       pdev->sbuf[i].data = NULL;
-               }
-       }
-
        pdev->iso_init = 0;
        PWC_DEBUG_OPEN("<< pwc_isoc_cleanup()\n");
 }

diff --git a/drivers/media/video/pwc/pwc.h b/drivers/media/video/pwc/pwc.h
index d65cd14..1cfb8b4 100644 (file)
--- a/drivers/media/video/pwc/pwc.h
+++ b/drivers/media/video/pwc/pwc.h
@@ -128,15 +128,6 @@
 #define DEVICE_USE_CODEC3(x) ((x)>=700)
 #define DEVICE_USE_CODEC23(x) ((x)>=675)
 
-/* The following structures were based on cpia.h. Why reinvent the wheel? :-) */
-struct pwc_iso_buf
-{
-       void *data;
-       int  length;
-       int  read;
-       struct urb *urb;
-};
-
 /* intermediate buffers with raw data from the USB cam */
 struct pwc_frame_buf
 {
@@ -180,7 +171,7 @@ struct pwc_device
        int cmd_len;
        unsigned char cmd_buf[13];
 
-       struct pwc_iso_buf sbuf[MAX_ISO_BUFS];
+       struct urb *urbs[MAX_ISO_BUFS];
        char iso_init;
 
        /* videobuf2 queue and queued buffers list */