Commits
Mark Walton committed 6f29e4c2dbb
gpio: pca953x: Fix dereference of irq data in shutdown
commit c378b3aa015931a46c91d6ccc2fe04d97801d060 upstream.
If a PCA953x gpio was used as an interrupt and then released,
the shutdown function was trying to extract the pca953x_chip
pointer directly from the irq_data, but in reality was getting
the gpio_chip structure.
The net effect was that the subsequent writes to the data
structure corrupted data in the gpio_chip structure, which wasn't
immediately obvious until attempting to use the GPIO again in the
future, at which point the kernel panics.
This fix correctly extracts the pca953x_chip structure via the
gpio_chip structure, as is correctly done in the other irq
functions.
Fixes: 0a70fe00efea ("gpio: pca953x: Clear irq trigger type on irq shutdown")
Cc: stable@vger.kernel.org
Signed-off-by: Mark Walton <mark.walton@serialtek.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>