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[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>
This commit is contained in:
Hans de Goede 2011-06-26 13:57:15 -03:00 committed by Mauro Carvalho Chehab
parent 4fba471e40
commit 04613c5e60
2 changed files with 28 additions and 59 deletions
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76
drivers/media/video/pwc/pwc-if.c
View File

@ -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");
}

11
drivers/media/video/pwc/pwc.h
View File

@ -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 */