Patch "ipmi/watchdog: fix wdog hang on panic waiting for ipmi response" has been added to the 4.9-stable tree

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

ipmi/watchdog: fix wdog hang on panic waiting for ipmi response

to the 4.9-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:
ipmi-watchdog-fix-wdog-hang-on-panic-waiting-for-ipmi-response.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Robert Lippert <[email protected]>
Date: Thu, 20 Apr 2017 16:49:47 -0700
Subject: ipmi/watchdog: fix wdog hang on panic waiting for ipmi response

From: Robert Lippert <[email protected]>

[ Upstream commit 2c1175c2e8e5487233cabde358a19577562ac83e ]

Commit c49c097610fe ("ipmi: Don't call receive handler in the panic context") means that the panic_recv_free is not called during a panic and the atomic count does not drop to 0.

Fix this by only expecting one decrement of the atomic variable which comes from panic_smi_free.

---
 drivers/char/ipmi/ipmi_watchdog.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -515,7 +515,7 @@ static void panic_halt_ipmi_heartbeat(vo
 	msg.cmd = IPMI_WDOG_RESET_TIMER;
 	msg.data = NULL;
 	msg.data_len = 0;
-	atomic_add(2, &panic_done_count);
+	atomic_add(1, &panic_done_count);
 	rv = ipmi_request_supply_msgs(watchdog_user,
 				      (struct ipmi_addr *) &addr,
 				      0,

@@ -525,7 +525,7 @@ static void panic_halt_ipmi_heartbeat(vo
 				      &panic_halt_heartbeat_recv_msg,
 				      1);
 	if (rv)
-		atomic_sub(2, &panic_done_count);
+		atomic_sub(1, &panic_done_count);
 }
 
 static struct ipmi_smi_msg panic_halt_smi_msg = {

@@ -549,12 +549,12 @@ static void panic_halt_ipmi_set_timeout(
 	/* Wait for the messages to be free. */
 	while (atomic_read(&panic_done_count) != 0)
 		ipmi_poll_interface(watchdog_user);
-	atomic_add(2, &panic_done_count);
+	atomic_add(1, &panic_done_count);
 	rv = i_ipmi_set_timeout(&panic_halt_smi_msg,
 				&panic_halt_recv_msg,
 				&send_heartbeat_now);
 	if (rv) {
-		atomic_sub(2, &panic_done_count);
+		atomic_sub(1, &panic_done_count);
 		printk(KERN_WARNING PFX
 		       "Unable to extend the watchdog timeout.");
 	} else {

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/ipmi-watchdog-fix-wdog-hang-on-panic-waiting-for-ipmi-response.patch