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27 March 2024, 02:37:15 UTC
Revision 33fea794b9deeb8ffb77e284eb37375b8f45a2c4 authored by Martin Schwidefsky on 27 July 2010, 17:29:38 UTC, committed by Martin Schwidefsky on 27 July 2010, 17:29:42 UTC 
[S390] etr: fix clock synchronization race
 
The etr events switch-to-local and sync-check disable the synchronous clock
and schedule a work queue that tries to get the clock back into sync.
If another switch-to-local or sync-check event occurs while the work queue
function etr_work_fn still runs the eacr.es bit and the clock_sync_word can
become inconsistent because check_sync_clock only uses the clock_sync_word
to determine if the clock is in sync or not. The second pass of the
etr_work_fn will reset the eacr.es bit but will leave the clock_sync_word
intact. Fix this race by moving the reset of the eacr.es bit into the
switch-to-local and sync-check functions and by checking the eacr.es bit
as well to decide if the clock needs to be synced.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1 parent f5cdac2
History
Tip revision: 33fea794b9deeb8ffb77e284eb37375b8f45a2c4 authored by Martin Schwidefsky on 27 July 2010, 17:29:38 UTC
[S390] etr: fix clock synchronization race
Tip revision: 33fea79
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