diff options
| author |   Florian Mickler <florian@mickler.org> | 2011-03-20 18:50:49 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-05-20 09:28:17 -0300 |
| commit | 029461dbea04f4b6943bd24b6ae7906f28593a2f (patch) | |
| tree | f72516fbf2d6eaeb8835520a048e9bfa455e3df2 /drivers/media/dvb/dvb-usb/ce6230.c | |
| parent | [media] ec168: get rid of on-stack dma buffers (diff) | |
| download | linux-dev-029461dbea04f4b6943bd24b6ae7906f28593a2f.tar.xz linux-dev-029461dbea04f4b6943bd24b6ae7906f28593a2f.zip | |
[media] ce6230: get rid of on-stack dma buffer
usb_control_msg initiates (and waits for completion of) a dma transfer using
the supplied buffer. That buffer thus has to be seperately allocated on
the heap.
In lib/dma_debug.c the function check_for_stack even warns about it:
WARNING: at lib/dma-debug.c:866 check_for_stack
Signed-off-by: Florian Mickler <florian@mickler.org>
Acked-by: Antti Palosaari <crope@iki.fi>
Reviewed-by: Antti Palosaari <crope@iki.fi>
Tested-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/dvb-usb/ce6230.c')
| -rw-r--r-- | drivers/media/dvb/dvb-usb/ce6230.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/media/dvb/dvb-usb/ce6230.c b/drivers/media/dvb/dvb-usb/ce6230.c index 3df2045b7d2d..6d1a3041540d 100644 --- a/drivers/media/dvb/dvb-usb/ce6230.c +++ b/drivers/media/dvb/dvb-usb/ce6230.c @@ -39,7 +39,7 @@ static int ce6230_rw_udev(struct usb_device *udev, struct req_t *req) u8 requesttype; u16 value; u16 index; - u8 buf[req->data_len]; + u8 *buf; request = req->cmd; value = req->value; @@ -62,6 +62,12 @@ static int ce6230_rw_udev(struct usb_device *udev, struct req_t *req) goto error; } + buf = kmalloc(req->data_len, GFP_KERNEL); + if (!buf) { + ret = -ENOMEM; + goto error; + } + if (requesttype == (USB_TYPE_VENDOR | USB_DIR_OUT)) { /* write */ memcpy(buf, req->data, req->data_len); @@ -74,7 +80,7 @@ static int ce6230_rw_udev(struct usb_device *udev, struct req_t *req) msleep(1); /* avoid I2C errors */ ret = usb_control_msg(udev, pipe, request, requesttype, value, index, - buf, sizeof(buf), CE6230_USB_TIMEOUT); + buf, req->data_len, CE6230_USB_TIMEOUT); ce6230_debug_dump(request, requesttype, value, index, buf, req->data_len, deb_xfer); @@ -88,6 +94,7 @@ static int ce6230_rw_udev(struct usb_device *udev, struct req_t *req) if (!ret && requesttype == (USB_TYPE_VENDOR | USB_DIR_IN)) memcpy(req->data, buf, req->data_len); + kfree(buf); error: return ret; } |