mfd: ab8500-core: Return zero in get_register_interruptible()

[ Upstream commit 10628e3ecf544fa2e4e24f8e112d95c37884dc98 ]

This function is supposed to return zero on success or negative error
codes on error.  Unfortunately, there is a bug so it sometimes returns
non-zero, positive numbers on success.

I noticed this bug during review and I can't test it.  It does appear
that the return is sometimes propogated back to _regmap_read() where all
non-zero returns are treated as failure so this may affect run time.

Fixes: 47c1697508f2 ("mfd: Align ab8500 with the abx500 interface")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 589eebf..2f212bd 100644 (file)
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -257,7 +257,7 @@ static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
        mutex_unlock(&ab8500->lock);
        dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);
 
-       return ret;
+       return (ret < 0) ? ret : 0;
 }
 
 static int ab8500_get_register(struct device *dev, u8 bank,