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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2022-06-21 08:40:36 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <brgl@bgdev.pl> | 2022-06-23 16:42:27 +0200 |
| commit | c1c2a15c2b5379ea8e44dcdcc298e3de42076ba0 (patch) | |
| tree | c3f483f65ccb9dbe9204dfc13cc3f415f0486e9f /drivers | |
| parent | 9ca766eaea2e87b8b773bff04ee56c055cb76d4e (diff) | |
| download | linux-c1c2a15c2b5379ea8e44dcdcc298e3de42076ba0.tar.bz2 | |
gpio: grgpio: Fix device removing
If a platform device's remove callback returns non-zero, the device core
emits a warning and still removes the device and calls the devm cleanup
callbacks.
So it's not save to not unregister the gpiochip because on the next request
to a GPIO the driver accesses kfree()'d memory. Also if an IRQ triggers,
the freed memory is accessed.
Instead rely on the GPIO framework to ensure that after gpiochip_remove()
all GPIOs are freed and so the corresponding IRQs are unmapped.
This is a preparation for making platform remove callbacks return void.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpio/gpio-grgpio.c | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c index df563616f943..bea0e32c195d 100644 --- a/drivers/gpio/gpio-grgpio.c +++ b/drivers/gpio/gpio-grgpio.c @@ -434,25 +434,13 @@ static int grgpio_probe(struct platform_device *ofdev) static int grgpio_remove(struct platform_device *ofdev) { struct grgpio_priv *priv = platform_get_drvdata(ofdev); - int i; - int ret = 0; - - if (priv->domain) { - for (i = 0; i < GRGPIO_MAX_NGPIO; i++) { - if (priv->uirqs[i].refcnt != 0) { - ret = -EBUSY; - goto out; - } - } - } gpiochip_remove(&priv->gc); if (priv->domain) irq_domain_remove(priv->domain); -out: - return ret; + return 0; } static const struct of_device_id grgpio_match[] = { |