This is a note to let you know that I've just added the patch titled nvme-apple: only reset the controller when RTKit is running to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nvme-apple-only-reset-the-controller-when-rtkit-is-r.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit f8123bbc8e8d844de122140803678982f6f573fd Author: Janne Grunau <j@xxxxxxxxxx> Date: Tue Jan 17 19:25:01 2023 +0100 nvme-apple: only reset the controller when RTKit is running [ Upstream commit c0a4a1eafbd48e02829045bba3e6163c03037276 ] NVMe controller register access hangs indefinitely when the co-processor is not running. A missed reset is preferable over a hanging thread since it could be recoverable. Signed-off-by: Janne Grunau <j@xxxxxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c index ff8b083dc5c6..262d2b60ac6d 100644 --- a/drivers/nvme/host/apple.c +++ b/drivers/nvme/host/apple.c @@ -987,11 +987,11 @@ static void apple_nvme_reset_work(struct work_struct *work) goto out; } - if (anv->ctrl.ctrl_config & NVME_CC_ENABLE) - apple_nvme_disable(anv, false); - /* RTKit must be shut down cleanly for the (soft)-reset to work */ if (apple_rtkit_is_running(anv->rtk)) { + /* reset the controller if it is enabled */ + if (anv->ctrl.ctrl_config & NVME_CC_ENABLE) + apple_nvme_disable(anv, false); dev_dbg(anv->dev, "Trying to shut down RTKit before reset."); ret = apple_rtkit_shutdown(anv->rtk); if (ret)