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authorTomas Janousek <tomi@nomi.cz>2008-07-30 01:33:51 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-30 12:41:47 -0400
commit5cdc98b8f51310f7cca05ad780f18f80dd9571de (patch)
treeb0a842eb693b030cc974bb036546af6b9b4b6ca2 /drivers/rtc
parent8d0b1c51eb8375f88c0886d2e9f71881e19d42a7 (diff)
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.c2
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)
432#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL 432#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
433 clear_uie(rtc); 433 clear_uie(rtc);
434#endif 434#endif
435 rtc_irq_set_state(rtc, NULL, 0);
436
435 if (rtc->ops->release) 437 if (rtc->ops->release)
436 rtc->ops->release(rtc->dev.parent); 438 rtc->ops->release(rtc->dev.parent);
437 439