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gpio: shared: gracefully handle no-device lookup of shared GPIOs

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We use platform lookup tables for shared GPIOs. This mechanism needs a
struct device to work so fwnode-based lookup with no device associated
currently causes a NULL-pointer deference.

Adding this functionality will require a larger rework and it has never
worked anyway so add a check that allows the kernel to gracefully handle
this situation with an error ahead of implementing that functionality as
a new feature.

Cc: stable@vger.kernel.org
Reported-by: Abel Vesa <abelvesa@kernel.org>
Fixes: a060b8c511 ("gpiolib: implement low-level, shared GPIO support")
Link: https://patch.msgid.link/20261014-gpio-shared-fwnode-lookup-v4-2-2253ad645fd6@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
This commit is contained in:
Bartosz Golaszewski 2026-10-14 11:38:26 +02:00
parent bd22f7e635
commit cf73c3fc03
1 changed files with 6 additions and 1 deletions
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7
drivers/gpio/gpiolib-shared.c
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@ -449,9 +449,14 @@ static bool gpio_shared_dev_is_reset_gpio(struct device *consumer,
int gpio_shared_add_proxy_lookup(struct device *consumer, struct fwnode_handle *fwnode,
const char *con_id, unsigned long lflags)
{
const char *dev_id = dev_name(consumer);
struct gpio_shared_entry *entry;
struct gpio_shared_ref *ref;
const char *dev_id;
if (!consumer)
return -EOPNOTSUPP;
dev_id = dev_name(consumer);
list_for_each_entry(entry, &gpio_shared_list, list) {
list_for_each_entry(ref, &entry->refs, list) {