Patch "watchdog: hpwdt: Check source of NMI" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    watchdog: hpwdt: Check source of NMI

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:
     watchdog-hpwdt-check-source-of-nmi.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 <stable@vger.kernel.org> know about it.


>From 838534e50e2e5c1e644e30ab6cb28da88eb31368 Mon Sep 17 00:00:00 2001
From: Jerry Hoemann <jerry.hoemann@hpe.com>
Date: Mon, 23 Oct 2017 16:46:17 -0600
Subject: watchdog: hpwdt: Check source of NMI

From: Jerry Hoemann <jerry.hoemann@hpe.com>

commit 838534e50e2e5c1e644e30ab6cb28da88eb31368 upstream.

Do not claim the NMI (i.e. return NMI_DONE) if the source of
the NMI isn't the iLO watchdog or debug.

Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/watchdog/hpwdt.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -51,6 +51,7 @@ static char expect_release;
 static unsigned long hpwdt_is_open;
 
 static void __iomem *pci_mem_addr;		/* the PCI-memory address */
+static unsigned long __iomem *hpwdt_nmistat;
 static unsigned long __iomem *hpwdt_timer_reg;
 static unsigned long __iomem *hpwdt_timer_con;
 
@@ -473,6 +474,11 @@ static int hpwdt_time_left(void)
 	return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
 }
 
+static int hpwdt_my_nmi(void)
+{
+	return ioread8(hpwdt_nmistat) & 0x6;
+}
+
 #ifdef CONFIG_HPWDT_NMI_DECODING
 /*
  *	NMI Handler
@@ -485,6 +491,9 @@ static int hpwdt_pretimeout(unsigned int
 	if (!hpwdt_nmi_decoding)
 		goto out;
 
+	if ((ulReason == NMI_UNKNOWN) && !hpwdt_my_nmi())
+		return NMI_DONE;
+
 	spin_lock_irqsave(&rom_lock, rom_pl);
 	if (!die_nmi_called && !is_icru && !is_uefi)
 		asminline_call(&cmn_regs, cru_rom_addr);
@@ -840,6 +849,7 @@ static int hpwdt_init_one(struct pci_dev
 		retval = -ENOMEM;
 		goto error_pci_iomap;
 	}
+	hpwdt_nmistat	= pci_mem_addr + 0x6e;
 	hpwdt_timer_reg = pci_mem_addr + 0x70;
 	hpwdt_timer_con = pci_mem_addr + 0x72;
 


Patches currently in stable-queue which might be from jerry.hoemann@hpe.com are

queue-4.4/watchdog-hpwdt-fix-unused-variable-warning.patch
queue-4.4/watchdog-hpwdt-smbios-check.patch
queue-4.4/watchdog-hpwdt-check-source-of-nmi.patch