linux-kernel - [ 120/175] [media] lgdt330x: fix signedness error in i2c_read_demod

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Message-Id: <20120330194849.907586661@linuxfoundation.org>
Date:	Fri, 30 Mar 2012 12:50:25 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Xi Wang <xi.wang@...il.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: [ 120/175] [media] lgdt330x: fix signedness error in i2c_read_demod_bytes()

3.3-stable review patch.  If anyone has any objections, please let me know.

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

From: Xi Wang <xi.wang@...il.com>

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 <xi.wang@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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;
 	}


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