Re: [v4, 06/10] watchdog/hpwdt: condition early return of NMI handler on iLO5

From: Guenter Roeck
Date: Sun Feb 25 2018 - 19:41:37 EST


On Sun, Feb 25, 2018 at 02:32:55PM -0700, Jerry Hoemann wrote:
> Modify prior change to not claim an NMI unless originated
> from iLO to apply only to iLO5 and later going forward.
> This restores hpwdt traditional behavior of calling panic
> if the NMI is NMI_IO_CHECK, NMI_SERR, or NMI_UNKNOWN for
> legacy hardware.
>
> Signed-off-by: Jerry Hoemann <jerry.hoemann@xxxxxxx>
> ---
> drivers/watchdog/hpwdt.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
> index 1a18326bc99d..e60c689ebdb2 100644
> --- a/drivers/watchdog/hpwdt.c
> +++ b/drivers/watchdog/hpwdt.c
> @@ -32,6 +32,7 @@
> #define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
> #define DEFAULT_MARGIN 30
>
> +static bool iLO5;

Another nitpick: CamelCase is still not preferred for variable names.

Guenter

> static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
> static unsigned int reload; /* the computed soft_margin */
> static bool nowayout = WATCHDOG_NOWAYOUT;
> @@ -121,7 +122,7 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
> "3. OA Forward Progress Log\n"
> "4. iLO Event Log";
>
> - if ((ulReason == NMI_UNKNOWN) && mynmi)
> + if (iLO5 && ulReason == NMI_UNKNOWN && mynmi)
> return NMI_DONE;
>
> if (allow_kdump)
> @@ -279,6 +280,9 @@ static int hpwdt_init_one(struct pci_dev *dev,
> ", timer margin: %d seconds (nowayout=%d).\n",
> HPWDT_VERSION, hpwdt_dev.timeout, nowayout);
>
> + if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
> + iLO5 = 1;
> +
> return 0;
>
> error_wd_register: