Re: [PATCH 1/5] gpio: pca954x: fix undefined error code from remove

From: Phil Reid
Date: Fri Aug 26 2016 - 11:47:18 EST

On 26/08/2016 23:25, Arnd Bergmann wrote:
The recent addition of the regulator support has led to the pca953x_remove
function returning uninitialized data when no platform data pointer is
provided, as gcc warns when using -Wmaybe-uninitialized:

drivers/gpio/gpio-pca953x.c: In function 'pca953x_remove':
drivers/gpio/gpio-pca953x.c:860:9: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This restores the previous behavior, returning 0 on success.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Fixes: e23efa311110 ("gpio: pca954x: Add vcc regulator and enable it")
Cc: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Alexandre Courbot <gnurou@xxxxxxxxx>
Cc: linux-gpio@xxxxxxxxxxxxxxx

drivers/gpio/gpio-pca953x.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index cbe2824461eb..b9d31d737dbf 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -853,6 +853,8 @@ static int pca953x_remove(struct i2c_client *client)
if (ret < 0)
dev_err(&client->dev, "%s failed, %d\n",
"teardown", ret);
+ } else {
+ ret = 0;


Ahh, commit 8c7a92dad1621f38d1ff4fe9eaac898d6f33a0a3 gpio: pca953x: remove redundant assignments
removed the 'redundant' initialisation of ret in this function.
Looks like I did not have this commit in my tree when I submitted did the regulator patch.
Sorry about that. Alternative to the 'else' is to add init at definition.

Acked-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>

Phil Reid