From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Dan Carpenter , Milo , Richard Purdie , Bryan Wu , Andrew Morton , Linus Torvalds Subject: [ 05/56] drivers/leds/leds-lp5521.c: fix lp5521_read() error handling Date: Fri, 30 Nov 2012 10:54:57 -0800 Message-Id: <20121130185118.896569929@linuxfoundation.org> In-Reply-To: <20121130185118.302752929@linuxfoundation.org> References: <20121130185118.302752929@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dan Carpenter commit 5bc9ad774c063f6b41965e7314f2c26aa5e465a0 upstream. Gcc 4.6.2 complains that: drivers/leds/leds-lp5521.c: In function `lp5521_load_program': drivers/leds/leds-lp5521.c:214:21: warning: `mode' may be used uninitialized in this function [-Wuninitialized] drivers/leds/leds-lp5521.c: In function `lp5521_probe': drivers/leds/leds-lp5521.c:788:5: warning: `buf' may be used uninitialized in this function [-Wuninitialized] drivers/leds/leds-lp5521.c:740:6: warning: `ret' may be used uninitialized in this function [-Wuninitialized] These are real problems if lp5521_read() returns an error. When that happens we should handle it, instead of ignoring it or doing a bitwise OR with all the other error codes and continuing. Signed-off-by: Dan Carpenter Cc: Milo Cc: Richard Purdie Cc: Bryan Wu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- drivers/leds/leds-lp5521.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/drivers/leds/leds-lp5521.c +++ b/drivers/leds/leds-lp5521.c @@ -193,9 +193,14 @@ static int lp5521_load_program(struct lp /* move current engine to direct mode and remember the state */ ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT); + if (ret) + return ret; + /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ usleep_range(1000, 2000); - ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode); + ret = lp5521_read(client, LP5521_REG_OP_MODE, &mode); + if (ret) + return ret; /* For loading, all the engines to load mode */ lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); @@ -211,8 +216,7 @@ static int lp5521_load_program(struct lp LP5521_PROG_MEM_SIZE, pattern); - ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode); - return ret; + return lp5521_write(client, LP5521_REG_OP_MODE, mode); } static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr) @@ -785,7 +789,7 @@ static int __devinit lp5521_probe(struct * LP5521_REG_ENABLE register will not have any effect - strange! */ ret = lp5521_read(client, LP5521_REG_R_CURRENT, &buf); - if (buf != LP5521_REG_R_CURR_DEFAULT) { + if (ret || buf != LP5521_REG_R_CURR_DEFAULT) { dev_err(&client->dev, "error in resetting chip\n"); goto fail2; }