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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-10-09 13:48:03 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-10-14 14:32:18 +0200 |
| commit | 29b0a8250ba63beffba4fe3a42fa75dddf4bd06a (patch) | |
| tree | 07d567892411d28f22003f73193ae37a80cf4d17 /arch/s390/include/asm/etr.h | |
| parent | s390/pci: reshuffle struct used to write debug data (diff) | |
| download | linux-29b0a8250ba63beffba4fe3a42fa75dddf4bd06a.tar.xz linux-29b0a8250ba63beffba4fe3a42fa75dddf4bd06a.zip | |
s390/etr,stp: fix possible deadlock on machine check
The first level machine check handler for etr and stp machine checks may
call queue_work() while in nmi context. This may deadlock e.g. if the
machine check happened when the interrupted context did hold a lock, that
also will be acquired by queue_work().
Therefore split etr and stp machine check handling into first and second
level handling. The second level handling will then issue the queue_work()
call in process context which avoids the potential deadlock.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/etr.h')
| -rw-r--r-- | arch/s390/include/asm/etr.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/s390/include/asm/etr.h b/arch/s390/include/asm/etr.h index f7e5c36688c3..105f90e63a0e 100644 --- a/arch/s390/include/asm/etr.h +++ b/arch/s390/include/asm/etr.h @@ -211,8 +211,9 @@ static inline int etr_ptff(void *ptff_block, unsigned int func) #define ETR_PTFF_SGS 0x43 /* set gross steering rate */ /* Functions needed by the machine check handler */ -void etr_switch_to_local(void); -void etr_sync_check(void); +int etr_switch_to_local(void); +int etr_sync_check(void); +void etr_queue_work(void); /* notifier for syncs */ extern struct atomic_notifier_head s390_epoch_delta_notifier; @@ -253,7 +254,8 @@ struct stp_sstpi { } __attribute__ ((packed)); /* Functions needed by the machine check handler */ -void stp_sync_check(void); -void stp_island_check(void); +int stp_sync_check(void); +int stp_island_check(void); +void stp_queue_work(void); #endif /* __S390_ETR_H */ |