Re: [PATCH v2] gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock

[Bartosz Golaszewski]

On Thu, 9 Jul 2026 06:51:16 +0200, Mark Tomlinson
<mark.tomlinson@xxxxxxxxxxxxxxxxxxx> said:
> Locking is disabled in the regmap config as this driver uses its own
> lock. This means that all calls to regmap functions (read or write) must
> hold the i2c_lock. The function pca953x_irq_bus_sync_unlock() did not do
> this, and it was therefore possible that multiple threads could cause an
> incorrect register to be read/written.
>
> A previous patch partly fixed this, but only protected the write to the
> interrupt mask register, and not the read from the direction register.
>
> Fixes: bfc6444b57dc ("gpio: pca953x: fix pca953x_irq_bus_sync_unlock race")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Mark Tomlinson <mark.tomlinson@xxxxxxxxxxxxxxxxxxx>
> ---

Please always include the entire changelog for the series, I don't know what
changed since v1 (no need to resend, just explain here).

Preferably use b4 for managing patch series.

Bart