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sysfs handlers should be called under ->init_lock and are not supposed to unlock it until return, otherwise e.g. a concurrent reset() can occur. There is one handler that breaks that rule: recomp_algorithm_show(). Move ->init_lock handling outside of __comp_algorithm_show() (also drop it and call zcomp_available_show() directly) so that the entire recomp_algorithm_show() loop is protected by the lock, as opposed to protecting individual iterations. The patch does not need to go to -stable, as it does not fix any runtime errors (at least I can't think of any). It makes recomp_algorithm_show() "atomic" w.r.t. zram reset() (just like the rest of zram sysfs show() handlers), that's a pretty minor change. Link: https://lkml.kernel.org/r/20250805101946.1774112-1-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Reported-by: Seyediman Seyedarab <imandevel@gmail.com> Suggested-by: Seyediman Seyedarab <imandevel@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>