Re: [PATCH AUTOSEL 5.10 11/17] spi: spidev: fix a race condition when accessing spidev->spi

On Mon, Jan 16, 2023 at 09:04:42AM -0500, Sasha Levin wrote:

From: Bartosz Golaszewski bartosz.golaszewski@linaro.org

[ Upstream commit a720416d94634068951773cb9e9d6f1b73769e5b ]

There's a spinlock in place that is taken in file_operations callbacks whenever we check if spidev->spi is still alive (not null). It's also taken when spidev->spi is set to NULL in remove().

There are ongoing discussions of race conditions with this commit.