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authorJerry Hoemann <jerry.hoemann@hpe.com>2017-10-23 16:46:17 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-15 10:56:56 +0100
commitaf153740467054a486bff556d952ade591bac0cb (patch)
tree1a406922e7fbbd34a1193682979a57303568a34a
parent2ade2293099d0e55f41bfd27c688586a19dcc591 (diff)
watchdog: hpwdt: Check source of NMI
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>
-rw-r--r--drivers/watchdog/hpwdt.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 9fd869fbd8a9..e61658310381 100644
--- 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 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;