diff options
| author | Boris BREZILLON <[email protected]> | 2014-06-06 14:36:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2014-06-06 16:08:08 -0700 |
| commit | 2fe121e1f5aa3bf31b418a9790db6c400e922291 (patch) | |
| tree | 0a0e52c511dbeb8d45b0e26a2399f5bcc7ed6737 /tools/perf/scripts/python | |
| parent | 68164a73b1055191975419f5da7180294902f461 (diff) | |
rtc: rtc-at91rm9200: fix infinite wait for ACKUPD irq
The rtc user must wait at least 1 sec between each time/calandar update
(see atmel's datasheet chapter "Updating Time/Calendar").
Use the 1Hz interrupt to update the at91_rtc_upd_rdy flag and wait for
the at91_rtc_wait_upd_rdy event if the rtc is not ready.
This patch fixes a deadlock in an uninterruptible wait when the RTC is
updated more than once every second. AFAICT the bug is here from the
beginning, but I think we should at least backport this fix to 3.10 and
the following longterm and stable releases.
Signed-off-by: Boris BREZILLON <[email protected]>
Reported-by: Bryan Evenson <[email protected]>
Tested-by: Bryan Evenson <[email protected]>
Cc: Andrew Victor <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Jean-Christophe Plagniol-Villard <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions