diff options
author | Tomas Janousek <tomi@nomi.cz> | 2008-07-29 22:33:51 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-30 09:41:47 -0700 |
commit | 5cdc98b8f51310f7cca05ad780f18f80dd9571de (patch) | |
tree | b0a842eb693b030cc974bb036546af6b9b4b6ca2 /drivers/rtc | |
parent | 8d0b1c51eb8375f88c0886d2e9f71881e19d42a7 (diff) | |
download | linux-5cdc98b8f51310f7cca05ad780f18f80dd9571de.tar.bz2 |
rtc-dev: stop periodic interrupts on device release
Solves http://bugzilla.kernel.org/show_bug.cgi?id=11127
The old rtc.c driver did it and some drivers (like rtc-sh) do it in their
release function, though they should not -- because they should provide
the irq_set_state op and the rtc framework itself should care about it.
This patch makes it do so.
I am aware that some drivers, like rtc-sh, handle userspace PIE sets in
their ioctl op (instead of having the framework call the op), exporting
the irq_set_state op at the same time. The logic in rtc_irq_set_state
should make sure it doesn't matter and the driver should not need to care
stopping periodic interrupts in its release routine any more.
The correct way, in my opinion, should be this:
1) The driver provides the irq_set_state op and does not care closing the
interrupts in its release op.
2) If the driver does not provide the op and handles PIE in the ioctl op, it's
reponsible for closing them in its release op.
3) Something similar for other IRQs, like UIE -- if there's no in-kernel API
like irq_set_state, handle it in ioctl and release ops. The framework will
be responsible either for everything or for nothing. (This will probably
change later.)
Signed-off-by: Tomas Janousek <tomi@nomi.cz>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
-rw-r--r-- | drivers/rtc/rtc-dev.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index ae3bd4de7675..856cc1af40df 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -432,6 +432,8 @@ static int rtc_dev_release(struct inode *inode, struct file *file) #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL clear_uie(rtc); #endif + rtc_irq_set_state(rtc, NULL, 0); + if (rtc->ops->release) rtc->ops->release(rtc->dev.parent); |