diff options
| author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-02-14 22:47:57 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-23 19:44:35 +0300 |
| commit | 6cf921be8fb98351b4b394d5c03a5ff718a0e679 (patch) | |
| tree | fa0d5dc292d5a335e9a543a1b2a058926d140a9b /drivers/media/usb | |
| parent | 166a2464cdcf20d4809cc8bb4004241816393a7f (diff) | |
| download | linux-6cf921be8fb98351b4b394d5c03a5ff718a0e679.tar.xz | |
siano: make it work again with CONFIG_VMAP_STACK
commit f9c85ee67164b37f9296eab3b754e543e4e96a1c upstream.
Reported as a Kaffeine bug:
https://bugs.kde.org/show_bug.cgi?id=375811
The USB control messages require DMA to work. We cannot pass
a stack-allocated buffer, as it is not warranted that the
stack would be into a DMA enabled area.
On Kernel 4.9, the default is to not accept DMA on stack anymore
on x86 architecture. On other architectures, this has been a
requirement since Kernel 2.2. So, after this patch, this driver
should likely work fine on all archs.
Tested with USB ID 2040:5510: Hauppauge Windham
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/media/usb')
| -rw-r--r-- | drivers/media/usb/siano/smsusb.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/media/usb/siano/smsusb.c b/drivers/media/usb/siano/smsusb.c index c2e25876e93b..18b41b9dc2e4 100644 --- a/drivers/media/usb/siano/smsusb.c +++ b/drivers/media/usb/siano/smsusb.c @@ -218,22 +218,30 @@ static int smsusb_start_streaming(struct smsusb_device_t *dev) static int smsusb_sendrequest(void *context, void *buffer, size_t size) { struct smsusb_device_t *dev = (struct smsusb_device_t *) context; - struct sms_msg_hdr *phdr = (struct sms_msg_hdr *) buffer; - int dummy; + struct sms_msg_hdr *phdr; + int dummy, ret; if (dev->state != SMSUSB_ACTIVE) { pr_debug("Device not active yet\n"); return -ENOENT; } + phdr = kmalloc(size, GFP_KERNEL); + if (!phdr) + return -ENOMEM; + memcpy(phdr, buffer, size); + pr_debug("sending %s(%d) size: %d\n", smscore_translate_msg(phdr->msg_type), phdr->msg_type, phdr->msg_length); smsendian_handle_tx_message((struct sms_msg_data *) phdr); - smsendian_handle_message_header((struct sms_msg_hdr *)buffer); - return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), - buffer, size, &dummy, 1000); + smsendian_handle_message_header((struct sms_msg_hdr *)phdr); + ret = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), + phdr, size, &dummy, 1000); + + kfree(phdr); + return ret; } static char *smsusb1_fw_lkup[] = { |