diff options
| author | MyungJoo Ham <[email protected]> | 2011-08-25 15:59:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2011-08-25 18:51:00 -0700 |
| commit | 62d1760180c84cba68cc83696fa0bde0593007bd (patch) | |
| tree | 67aac33c82bec7cc50034374c58b7ef1f5bd38a2 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 4e8896cde182b4eab6f2d0af9b6eef87720fae0d (diff) | |
drivers/rtc/rtc-s3c.c: allow multiple open / allow no-ioctl-open'ed rtc to have irq.
The previous rtc-s3c had two issues related with its IRQ.
1. Users cannot open rtc multiple times because an open operation
calls request_irq on the same IRQ. (e.g., two user processes wants to
open and read RTC time from rtc-s3c at the same time)
2. If alarm is set and no one has the rtc opened with filesystem
(either the alarm is set by kernel/boot-loader or user set an alarm and
closed rtc dev file), the pending bit is not cleared and no further
interrupt is invoked. When the alarm is used by the system itself such
as a resume from suspend-to-RAM or other Low-power modes/idle, this is
a critical issue.
This patch mitigates these issues by calling request_irq at probe and
free_irq at remove.
Signed-off-by: MyungJoo Ham <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
Acked-by: Kukjin Kim <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Changhwan Youn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions