linux/arch/s390/lib
Heiko Carstens 8497695243 s390/spinlock: avoid yield to non existent cpu
arch_spin_lock_wait_flags() checks if a spinlock is not held before
trying a compare and swap instruction. If the lock is unlocked it
tries the compare and swap instruction, however if a different cpu
grabbed the lock in the meantime the instruction will fail as
expected.

Subsequently the arch_spin_lock_wait_flags() incorrectly tries to
figure out if the cpu that holds the lock is running. However it is
using the wrong cpu number for this (-1) and then will also yield the
current cpu to the wrong cpu.

Fix this by adding a missing continue statement.

Fixes: 470ada6b1a ("s390/spinlock: refactor arch_spin_lock_wait[_flags]")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-04-15 18:01:48 +02:00
..
delay.c s390/udelay: make udelay have busy loop semantics 2015-10-14 14:32:13 +02:00
find.c s390/bitops: remove 31 bit related comments 2015-10-14 14:32:15 +02:00
Makefile s390/xor: optimized xor routing using the XC instruction 2016-02-23 08:56:17 +01:00
mem.S s390: remove "64" suffix from mem64.S and swsusp_asm64.S 2015-03-25 11:49:51 +01:00
probes.c s390/uprobes: fix kprobes dependency 2014-10-17 14:45:51 +02:00
spinlock.c s390/spinlock: avoid yield to non existent cpu 2016-04-15 18:01:48 +02:00
string.c s390/string: provide asm lib functions for memcpy and memcmp 2012-09-26 15:44:50 +02:00
uaccess.c Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-03 15:46:07 -07:00
xor.c s390/xor: optimized xor routing using the XC instruction 2016-02-23 08:56:17 +01:00