[PATCH 3.16 040/254] media: dvb: i2c transfers over usb cannot be done from stack

[Ben Hutchings]

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Laurent Caumont <lcaumo...@gmail.com>

commit 6d33377f2abbf9f0e561b116dd468d1c3ff36a6a upstream.

Signed-off-by: Laurent Caumont <lcaumo...@gmail.com>
Signed-off-by: Sean Young <s...@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/media/usb/dvb-usb/dibusb-common.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

--- a/drivers/media/usb/dvb-usb/dibusb-common.c
+++ b/drivers/media/usb/dvb-usb/dibusb-common.c
@@ -179,8 +179,20 @@ EXPORT_SYMBOL(dibusb_i2c_algo);
 
 int dibusb_read_eeprom_byte(struct dvb_usb_device *d, u8 offs, u8 *val)
 {
-       u8 wbuf[1] = { offs };
-       return dibusb_i2c_msg(d, 0x50, wbuf, 1, val, 1);
+       u8 *buf;
+       int rc;
+
+       buf = kmalloc(2, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       buf[0] = offs;
+
+       rc = dibusb_i2c_msg(d, 0x50, &buf[0], 1, &buf[1], 1);
+       *val = buf[1];
+       kfree(buf);
+
+       return rc;
 }
 EXPORT_SYMBOL(dibusb_read_eeprom_byte);