Patch "[PATCH 034/135] Drivers: hv: util: Increase the timeout for util" has been added to the 4.4-stable tree

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

[PATCH 034/135] Drivers: hv: util: Increase the timeout for util

to the 4.4-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:
0034-Drivers-hv-util-Increase-the-timeout-for-util-servic.patch
and it can be found in the queue-4.4 subdirectory.

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

From: "K. Y. Srinivasan" <[email protected]>
Date: Mon, 14 Dec 2015 16:01:32 -0800
Subject: [PATCH 034/135] Drivers: hv: util: Increase the timeout for util
services

[ Upstream commit c0b200cfb0403740171c7527b3ac71d03f82947a ]

Util services such as KVP and FCOPY need assistance from daemon's running in user space. Increase the timeout so we don't prematurely terminate the transaction in the kernel. Host sets up a 60 second timeout for all util driver transactions. The host will retry the transaction if it times out. Set the guest timeout at 30 seconds.

---
 drivers/hv/hv_fcopy.c     |    3 ++-
 drivers/hv/hv_kvp.c       |    3 ++-
 drivers/hv/hyperv_vmbus.h |    5 +++++
 3 files changed, 9 insertions(+), 2 deletions(-)

@@ -275,7 +275,8 @@ void hv_fcopy_onchannelcallback(void *co
 		 * Send the information to the user-level daemon.
 		 */
 		schedule_work(&fcopy_send_work);
-		schedule_delayed_work(&fcopy_timeout_work, 5*HZ);
+		schedule_delayed_work(&fcopy_timeout_work,
+				      HV_UTIL_TIMEOUT * HZ);
 		return;
 	}
 	icmsghdr->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;

@@ -668,7 +668,8 @@ void hv_kvp_onchannelcallback(void *cont
 			 * user-mode not responding.
 			 */
 			schedule_work(&kvp_sendkey_work);
-			schedule_delayed_work(&kvp_timeout_work, 5*HZ);
+			schedule_delayed_work(&kvp_timeout_work,
+					      HV_UTIL_TIMEOUT * HZ);
 
 			return;
 

@@ -31,6 +31,11 @@
 #include <linux/hyperv.h>
 
 /*
+ * Timeout for services such as KVP and fcopy.
+ */
+#define HV_UTIL_TIMEOUT 30
+
+/*
  * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
  * is set by CPUID(HVCPUID_VERSION_FEATURES).
  */

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

queue-4.4/0036-tools-hv-report-ENOSPC-errors-in-hv_fcopy_daemon.patch queue-4.4/0038-drivers-hv-cleanup-synic-msrs-if-vmbus-connect-faile.patch queue-4.4/0034-Drivers-hv-util-Increase-the-timeout-for-util-servic.patch queue-4.4/0097-Drivers-hv-vmbus-avoid-infinite-loop-in-init_vp_inde.patch queue-4.4/0035-Drivers-hv-utils-run-polling-callback-always-in-inte.patch queue-4.4/0118-clocksource-Allow-unregistering-the-watchdog.patch queue-4.4/0099-Drivers-hv-vmbus-don-t-manipulate-with-clocksources-.patch queue-4.4/0127-x86-hyperv-Avoid-reporting-bogus-NMI-status-for-Gen2.patch queue-4.4/0041-Drivers-hv-vmbus-fix-rescind-offer-handling-for-devi.patch queue-4.4/0098-Drivers-hv-vmbus-avoid-scheduling-in-interrupt-conte.patch queue-4.4/0037-Drivers-hv-util-catch-allocation-errors.patch queue-4.4/0039-Drivers-hv-vss-run-only-on-supported-host-versions.patch queue-4.4/0040-Drivers-hv-vmbus-serialize-process_chn_event-and-vmb.patch