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| author | Geert Uytterhoeven | 2019-03-28 14:13:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-05-04 09:20:21 +0200 |
| commit | a918af5b6fd80321c54707af60306bff5a8dbb1d (patch) | |
| tree | 5f3cedf760dc153095c974f516d089bb5a525df9 /drivers/gpio | |
| parent | libata: fix using DMA buffers on stack (diff) | |
| download | kernel-qcow2-linux-a918af5b6fd80321c54707af60306bff5a8dbb1d.tar.gz kernel-qcow2-linux-a918af5b6fd80321c54707af60306bff5a8dbb1d.tar.xz kernel-qcow2-linux-a918af5b6fd80321c54707af60306bff5a8dbb1d.zip | |
gpio: of: Fix of_gpiochip_add() error path
[ Upstream commit f7299d441a4da8a5088e651ea55023525a793a13 ]
If the call to of_gpiochip_scan_gpios() in of_gpiochip_add() fails, no
error handling is performed. This lead to the need of callers to call
of_gpiochip_remove() on failure, which causes "BAD of_node_put() on ..."
if the failure happened before the call to of_node_get().
Fix this by adding proper error handling.
Note that calling gpiochip_remove_pin_ranges() multiple times causes no
harm: subsequent calls are a no-op.
Fixes: dfbd379ba9b7431e ("gpio: of: Return error if gpio hog configuration failed")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index d4e7a09598fa..e0f149bdf98f 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -646,7 +646,13 @@ int of_gpiochip_add(struct gpio_chip *chip) of_node_get(chip->of_node); - return of_gpiochip_scan_gpios(chip); + status = of_gpiochip_scan_gpios(chip); + if (status) { + of_node_put(chip->of_node); + gpiochip_remove_pin_ranges(chip); + } + + return status; } void of_gpiochip_remove(struct gpio_chip *chip) |