Messages in this thread Patch in this message | | | From | Jerry Hoemann <> | Subject | [PATCH 3/3] watchdog: hpwdt: Check source of NMI | Date | Fri, 20 Oct 2017 16:54:50 -0600 |
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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> --- drivers/watchdog/hpwdt.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index 4c011e8..b64ce43 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -53,6 +53,7 @@ static const int pretimeout = 9; 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; @@ -475,6 +476,11 @@ 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 @@ -487,6 +493,9 @@ 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); @@ -849,6 +858,7 @@ 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; -- 1.8.3.1
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