media: dvb: i2c transfers over usb cannot be done from stack

commit 6d33377f2abbf9f0e561b116dd468d1c3ff36a6a upstream.

Signed-off-by: Laurent Caumont <lcaumont2@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/media/dvb/dvb-usb/dibusb-common.c b/drivers/media/dvb/dvb-usb/dibusb-common.c
index a76bbb2..e314c32 100644 (file)
--- a/drivers/media/dvb/dvb-usb/dibusb-common.c
+++ b/drivers/media/dvb/dvb-usb/dibusb-common.c
@@ -169,8 +169,20 @@ 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);