From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20120330194849.907586661@linuxfoundation.org> Date: Fri, 30 Mar 2012 12:50:25 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Xi Wang , Mauro Carvalho Chehab Subject: [ 120/175] [media] lgdt330x: fix signedness error in i2c_read_demod_bytes() In-Reply-To: <20120330195801.GA31806@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xi Wang commit 34817174fca0c5512c2d5b6ea0fc37a0337ce1d8 upstream. The error handling in lgdt3303_read_status() and lgdt330x_read_ucblocks() doesn't work, because i2c_read_demod_bytes() returns a u8 and (err < 0) is always false. err = i2c_read_demod_bytes(state, 0x58, buf, 1); if (err < 0) return err; Change the return type of i2c_read_demod_bytes() to int. Also change the return value on error to -EIO to make (err < 0) work. Signed-off-by: Xi Wang Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/dvb/frontends/lgdt330x.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/media/dvb/frontends/lgdt330x.c +++ b/drivers/media/dvb/frontends/lgdt330x.c @@ -104,8 +104,8 @@ static int i2c_write_demod_bytes (struct * then reads the data returned for (len) bytes. */ -static u8 i2c_read_demod_bytes (struct lgdt330x_state* state, - enum I2C_REG reg, u8* buf, int len) +static int i2c_read_demod_bytes(struct lgdt330x_state *state, + enum I2C_REG reg, u8 *buf, int len) { u8 wr [] = { reg }; struct i2c_msg msg [] = { @@ -118,6 +118,8 @@ static u8 i2c_read_demod_bytes (struct l ret = i2c_transfer(state->i2c, msg, 2); if (ret != 2) { printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __func__, state->config->demod_address, reg, ret); + if (ret >= 0) + ret = -EIO; } else { ret = 0; }