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

watchdog: hpwdt: Check source of NMI

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: watchdog-hpwdt-check-source-of-nmi.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 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 @@ -52,6 +52,7 @@ 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;

@@ -474,6 +475,11 @@ 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 @@ -486,6 +492,9 @@ static int hpwdt_pretimeout(unsigned int if (!hpwdt_nmi_decoding) return NMI_DONE;

+ 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); @@ -842,6 +851,7 @@ 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-4.9/watchdog-hpwdt-fix-unused-variable-warning.patch queue-4.9/watchdog-hpwdt-smbios-check.patch queue-4.9/watchdog-hpwdt-remove-legacy-nmi-sourcing.patch queue-4.9/watchdog-hpwdt-check-source-of-nmi.patch