[PATCH 4.9 30/36] leds: lp5523: check return value of lp5xx_read and jump to cleanup code

[Greg Kroah-Hartman]

From: Phillip Potter <phil@xxxxxxxxxxxxxxxx>

commit 6647f7a06eb030a2384ec71f0bb2e78854afabfe upstream.

Check return value of lp5xx_read and if non-zero, jump to code at end of
the function, causing lp5523_stop_all_engines to be executed before
returning the error value up the call chain. This fixes the original
commit (248b57015f35) which was reverted due to the University of Minnesota
problems.

Cc: stable <stable@xxxxxxxxxxxxxxx>
Acked-by: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>
Signed-off-by: Phillip Potter <phil@xxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210503115736.2104747-10-gregkh@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/leds/leds-lp5523.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/leds/leds-lp5523.c
+++ b/drivers/leds/leds-lp5523.c
@@ -318,7 +318,9 @@ static int lp5523_init_program_engine(st
 
 	/* Let the programs run for couple of ms and check the engine status */
 	usleep_range(3000, 6000);
-	lp55xx_read(chip, LP5523_REG_STATUS, &status);
+	ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
+	if (ret)
+		goto out;
 	status &= LP5523_ENG_STATUS_MASK;
 
 	if (status != LP5523_ENG_STATUS_MASK) {