diff options
author | Vasily Gorbik | 2018-07-13 08:13:13 +0200 |
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committer | Martin Schwidefsky | 2018-07-16 15:45:41 +0200 |
commit | ac4c4fc87d6beb6dd8287f24670e5e81c24b1de7 (patch) | |
tree | d6306145ff1baaaf3c0c134006ad24116ff9f1cd /arch/s390/mm/mem_detect.c | |
parent | a09baa9543ef1ced2cc7c171a055712ec8af62a3 (diff) |
s390/cmm: avoid add_timer on concurrently used timer
cmm_set_timer could be called concurrently from cmm_thread, cmm proc
handler, upon cmm smsg receive and timer function itself. To avoid
potential race condition and hitting BUG_ON in add_timer on already
pending timer simply reuse mod_timer which is according to
documentation "the only safe way to modify the timeout" with multiple
unserialized concurrent users. mod_timer can handle both active and
inactive timers which allows to carry out minor code simplification as
well.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/mem_detect.c')
0 files changed, 0 insertions, 0 deletions