| Message ID | 20231213215340.495734-2-jerry.hoemann@hpe.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | watchdog/hpwdt: Cleanup Claiming NMI | expand |
On Wed, Dec 13, 2023 at 02:53:38PM -0700, Jerry Hoemann wrote: > Avoid unnecessary crashes by claiming only NMIs that are due to > ERROR signalling or generated by the hpwdt hardware device. > > The code does this, but only for iLO5. > > The intent was to preserve legacy, Gen9 and earlier, semantics of > using hpwdt for error containtment as hardware/firmware would signal > fatal IO errors as an NMI with the expectation of hpwdt crashing > the system. Howerver, these IO errors should be received by hpwdt > as an NMI_IO_CHECK. So the test is overly permissive and should > not be limited to only ilo5. > > We need to enable this protection for future iLOs not matching the > current PCI IDs. > > Fixes: 62290a5c194b ("watchdog: hpwdt: Claim NMIs generated by iLO5") > Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/watchdog/hpwdt.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c > index f79f932bca14..79ed1626d8ea 100644 > --- a/drivers/watchdog/hpwdt.c > +++ b/drivers/watchdog/hpwdt.c > @@ -178,7 +178,7 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) > "3. OA Forward Progress Log\n" > "4. iLO Event Log"; > > - if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi) > + if (ulReason == NMI_UNKNOWN && !mynmi) > return NMI_DONE; > > if (ilo5 && !pretimeout && !mynmi) > -- > 2.41.0 >
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index f79f932bca14..79ed1626d8ea 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -178,7 +178,7 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) "3. OA Forward Progress Log\n" "4. iLO Event Log"; - if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi) + if (ulReason == NMI_UNKNOWN && !mynmi) return NMI_DONE; if (ilo5 && !pretimeout && !mynmi)
Avoid unnecessary crashes by claiming only NMIs that are due to ERROR signalling or generated by the hpwdt hardware device. The code does this, but only for iLO5. The intent was to preserve legacy, Gen9 and earlier, semantics of using hpwdt for error containtment as hardware/firmware would signal fatal IO errors as an NMI with the expectation of hpwdt crashing the system. Howerver, these IO errors should be received by hpwdt as an NMI_IO_CHECK. So the test is overly permissive and should not be limited to only ilo5. We need to enable this protection for future iLOs not matching the current PCI IDs. Fixes: 62290a5c194b ("watchdog: hpwdt: Claim NMIs generated by iLO5") Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com> --- drivers/watchdog/hpwdt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)