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watchdog: hpwdt: Check source of NMI

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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>
This commit is contained in:
Jerry Hoemann 2017-10-23 16:46:17 -06:00 committed by Wim Van Sebroeck
parent e531037145
commit 838534e50e
1 changed files with 10 additions and 0 deletions
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10
drivers/watchdog/hpwdt.c
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@ -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 ulReason, struct pt_regs *regs)
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 *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;