4.19-stable review patch. If anyone has any objections, please let me know.
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From: Jerry Hoemann jerry.hoemann@hpe.com
[ Upstream commit dced0b3e51dd2af3730efe14dd86b5e3173f0a65 ]
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 Link: https://lore.kernel.org/r/20231213215340.495734-2-jerry.hoemann@hpe.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Wim Van Sebroeck wim@linux-watchdog.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 9dc62a461451..c8e747005728 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -159,7 +159,7 @@ 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)