linux-kernel - [PATCH 1/1] Drivers: hv: vmbus: Only notify Hyper-V for die events that are oops

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Message-Id: <1596730935-11564-1-git-send-email-mikelley@microsoft.com>
Date:   Thu,  6 Aug 2020 09:22:15 -0700
From:   Michael Kelley <mikelley@...rosoft.com>
To:     linux-kernel@...r.kernel.org, vkuznets@...hat.com,
        kys@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        linux-hyperv@...r.kernel.org
Cc:     mikelley@...rosoft.com
Subject: [PATCH 1/1] Drivers: hv: vmbus: Only notify Hyper-V for die events that are oops

Hyper-V currently may be notified of a panic for any die event. But
this results in false panic notifications for various user space traps
that are die events. Fix this by ignoring die events that aren't oops.

Fixes: 510f7aef65bb ("Drivers: hv: vmbus: prefer 'die' notification chain to 'panic'")
Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 drivers/hv/vmbus_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index b50081c..910b6e9 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -86,6 +86,10 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
 	struct die_args *die = (struct die_args *)args;
 	struct pt_regs *regs = die->regs;
 
+	/* Don't notify Hyper-V if the die event is other than oops */
+	if (val != DIE_OOPS)
+		return NOTIFY_DONE;
+
 	/*
 	 * Hyper-V should be notified only once about a panic.  If we will be
 	 * doing hyperv_report_panic_msg() later with kmsg data, don't do
-- 
1.8.3.1