patch "mei: hbm: drop capability response on early shutdown" added to char-misc-linus

This is a note to let you know that I've just added the patch titled

mei: hbm: drop capability response on early shutdown

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 68553650bc9c57c7e530c84e5b2945e9dfe1a560 Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <[email protected]>
Date: Mon, 6 Jun 2022 17:42:24 +0300
Subject: mei: hbm: drop capability response on early shutdown

Drop HBM responses also in the early shutdown phase where the usual traffic is allowed.
Extend the rule that drop HBM responses received during the shutdown phase by also in MEI_DEV_POWERING_DOWN state.
This resolves the stall if the driver is stopping in the middle of the link initialization or link reset.

Drop the capabilities response on early shutdown.

---
 drivers/misc/mei/hbm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index cebcca6d6d3e..cf2b8261da14 100644
@@ -1351,7 +1351,8 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 
 		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 		    dev->hbm_state != MEI_HBM_CAP_SETUP) {
-			if (dev->dev_state == MEI_DEV_POWER_DOWN) {
+			if (dev->dev_state == MEI_DEV_POWER_DOWN ||
+			    dev->dev_state == MEI_DEV_POWERING_DOWN) {
 				dev_dbg(dev->dev, "hbm: capabilities response: on shutdown, ignoring\n");
 				return 0;
 			}

2.36.1