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| author | Florian Mickler <florian@mickler.org> | 2011-03-20 18:50:48 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-05-20 09:28:16 -0300 |
| commit | 26b72c6e5a67ceef4c62c279d5952f723515d990 (patch) | |
| tree | bbb00d58967e18e59c0b429bb29d078eb2b1f993 /drivers/media | |
| parent | 60f81f12fa63213567b0b40546faa82b8f5d5b0c (diff) | |
| download | kernel_samsung_smdk4412-26b72c6e5a67ceef4c62c279d5952f723515d990.zip kernel_samsung_smdk4412-26b72c6e5a67ceef4c62c279d5952f723515d990.tar.gz kernel_samsung_smdk4412-26b72c6e5a67ceef4c62c279d5952f723515d990.tar.bz2 | |
[media] ec168: get rid of on-stack dma buffers
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')
| -rw-r--r-- | drivers/media/dvb/dvb-usb/ec168.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/media/dvb/dvb-usb/ec168.c b/drivers/media/dvb/dvb-usb/ec168.c index 52f5d4f..1ba3e5d 100644 --- a/drivers/media/dvb/dvb-usb/ec168.c +++ b/drivers/media/dvb/dvb-usb/ec168.c @@ -36,7 +36,9 @@ static int ec168_rw_udev(struct usb_device *udev, struct ec168_req *req) int ret; unsigned int pipe; u8 request, requesttype; - u8 buf[req->size]; + u8 *buf; + + switch (req->cmd) { case DOWNLOAD_FIRMWARE: @@ -72,6 +74,12 @@ static int ec168_rw_udev(struct usb_device *udev, struct ec168_req *req) goto error; } + buf = kmalloc(req->size, GFP_KERNEL); + if (!buf) { + ret = -ENOMEM; + goto error; + } + if (requesttype == (USB_TYPE_VENDOR | USB_DIR_OUT)) { /* write */ memcpy(buf, req->data, req->size); @@ -84,13 +92,13 @@ static int ec168_rw_udev(struct usb_device *udev, struct ec168_req *req) msleep(1); /* avoid I2C errors */ ret = usb_control_msg(udev, pipe, request, requesttype, req->value, - req->index, buf, sizeof(buf), EC168_USB_TIMEOUT); + req->index, buf, req->size, EC168_USB_TIMEOUT); ec168_debug_dump(request, requesttype, req->value, req->index, buf, req->size, deb_xfer); if (ret < 0) - goto error; + goto err_dealloc; else ret = 0; @@ -98,7 +106,11 @@ static int ec168_rw_udev(struct usb_device *udev, struct ec168_req *req) if (!ret && requesttype == (USB_TYPE_VENDOR | USB_DIR_IN)) memcpy(req->data, buf, req->size); + kfree(buf); return ret; + +err_dealloc: + kfree(buf); error: deb_info("%s: failed:%d\n", __func__, ret); return ret; |