diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2012-05-29 15:07:26 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-12-03 11:46:36 -0800 |
| commit | 896c631494d7ed4e609ef7b7b312b8a19b21f394 (patch) | |
| tree | c1681c204cf711e01ca642834befe12227b292a3 /drivers/leds | |
| parent | d4cad86a445a5229b58bbb7beaa0753f09314855 (diff) | |
drivers/leds/leds-lp5521.c: fix lp5521_read() error handling
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 <dan.carpenter@oracle.com>
Cc: Milo <Milo.Kim@ti.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-lp5521.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c index 410a723b8691..23815624f35e 100644 --- a/drivers/leds/leds-lp5521.c +++ b/drivers/leds/leds-lp5521.c @@ -193,9 +193,14 @@ static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern) /* 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 lp5521_engine *eng, const u8 *pattern) 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 i2c_client *client, * 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; } |