[lkml]   [2012]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    Patch in this message
    Subject[patch] drivers/leds/leds-lp5521.c: fix lp5521_read() error handling
    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 <>

    diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
    index de7b8fe..2381562 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)

    - 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)
    @@ -784,8 +788,8 @@ static int __devinit lp5521_probe(struct i2c_client *client,
    * otherwise further access to the R G B channels in the
    * LP5521_REG_ENABLE register will not have any effect - strange!
    - lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
    - if (buf != LP5521_REG_R_CURR_DEFAULT) {
    + ret = lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
    + if (ret || buf != LP5521_REG_R_CURR_DEFAULT) {
    dev_err(&client->dev, "error in resetting chip\n");
    goto fail2;
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at
     \ /
      Last update: 2012-02-01 15:43    [W:0.024 / U:51.596 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site