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![]() [Issue] There is a scenario which efi_pstore may hang up: - cpuA grabs efivars->lock - cpuB panics and calls smp_send_stop - smp_send_stop sends IRQ to cpuA - after 1 second, cpuB gives up on cpuA and sends an NMI instead - cpuA is now in an NMI handler while still holding efivars->lock - cpuB is deadlocked This case may happen if a firmware has a bug and cpuA is stuck talking with it. [Solution] This patch changes a spin_lock to a spin_trylock in non-blocking paths. and if the spin_lock has already taken by another cpu, it returns without accessing to a firmware to avoid the deadlock. Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Acked-by: Don Zickus <dzickus@redhat.com> Signed-off-by: Tony Luck <tony.luck@intel.com> |
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.. | ||
dcdbas.c | ||
dcdbas.h | ||
dell_rbu.c | ||
dmi-id.c | ||
dmi-sysfs.c | ||
dmi_scan.c | ||
edd.c | ||
efivars.c | ||
iscsi_ibft.c | ||
iscsi_ibft_find.c | ||
Kconfig | ||
Makefile | ||
memmap.c | ||
pcdp.c | ||
pcdp.h |