6.15-stable review patch. If anyone has any objections, please let me know.
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From: Sean Nyekjaer sean@geanix.com
commit 1fe16dc1a2f5057772e5391ec042ed7442966c9a upstream.
fxls8962af_fifo_flush() uses indio_dev->active_scan_mask (with iio_for_each_active_channel()) without making sure the indio_dev stays in buffer mode. There is a race if indio_dev exits buffer mode in the middle of the interrupt that flushes the fifo. Fix this by calling synchronize_irq() to ensure that no interrupt is currently running when disabling buffer mode.
Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [...] _find_first_bit_le from fxls8962af_fifo_flush+0x17c/0x290 fxls8962af_fifo_flush from fxls8962af_interrupt+0x80/0x178 fxls8962af_interrupt from irq_thread_fn+0x1c/0x7c irq_thread_fn from irq_thread+0x110/0x1f4 irq_thread from kthread+0xe0/0xfc kthread from ret_from_fork+0x14/0x2c
Fixes: 79e3a5bdd9ef ("iio: accel: fxls8962af: add hw buffered sampling") Cc: stable@vger.kernel.org Suggested-by: David Lechner dlechner@baylibre.com Signed-off-by: Sean Nyekjaer sean@geanix.com Link: https://patch.msgid.link/20250603-fxlsrace-v2-1-5381b36ba1db@geanix.com Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/accel/fxls8962af-core.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/iio/accel/fxls8962af-core.c +++ b/drivers/iio/accel/fxls8962af-core.c @@ -877,6 +877,8 @@ static int fxls8962af_buffer_predisable( if (ret) return ret;
+ synchronize_irq(data->irq); + ret = __fxls8962af_fifo_set_mode(data, false);
if (data->enable_event)