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| author | Axel Lin <axel.lin@gmail.com> | 2011-10-31 17:12:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-31 17:30:55 -0700 |
| commit | fa0ea0e16f748e36d65931227188ccf07f2b77c7 (patch) | |
| tree | aa6f67424045340e8a71f4700905e40eaebbf780 /drivers/leds/leds-lp5521.c | |
| parent | 2b67c95b74f17c13c7b3a990540c9dd9b4a8480d (diff) | |
| download | linux-fa0ea0e16f748e36d65931227188ccf07f2b77c7.tar.gz linux-fa0ea0e16f748e36d65931227188ccf07f2b77c7.tar.bz2 linux-fa0ea0e16f748e36d65931227188ccf07f2b77c7.zip | |
drivers/leds/leds-lp5521.c: avoid writing uninitialized value to LP5521_REG_OP_MODE register
If lp5521_read fails, engine_state variable is not initialized.
If lp5521_read fails, we should return error.
This patch fixes below warning.
CC drivers/leds/leds-lp5521.o
drivers/leds/leds-lp5521.c: In function 'lp5521_set_engine_mode':
drivers/leds/leds-lp5521.c:168: warning: 'engine_state' may be used uninitialized in this function
[akpm@linux-foundation.org: remove unneeded "ret |="]
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Cc: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/leds/leds-lp5521.c')
| -rw-r--r-- | drivers/leds/leds-lp5521.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c index 9fc122c81f06..16f281b8c2d0 100644 --- a/drivers/leds/leds-lp5521.c +++ b/drivers/leds/leds-lp5521.c @@ -175,14 +175,14 @@ static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode) mode = LP5521_CMD_DIRECT; ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state); + if (ret < 0) + return ret; /* set mode only for this engine */ engine_state &= ~(engine->engine_mask); mode &= engine->engine_mask; engine_state |= mode; - ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state); - - return ret; + return lp5521_write(client, LP5521_REG_OP_MODE, engine_state); } static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern) |