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freezer: introduce freezer-friendly waiting macros

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Introduce freezer-friendly wrappers around wait_event_interruptible() and
wait_event_interruptible_timeout(), originally defined in <linux/wait.h>, to
be used in freezable kernel threads.  Make some of the freezable kernel
threads use them.

This is necessary for the freezer to stop sending signals to kernel threads,
which is implemented in the next patch.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki
2007-10-18 03:04:45 -07:00
committed by Linus Torvalds
parent 2e1318956c
commit e42837bcd3
7 changed files with 45 additions and 13 deletions
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5
drivers/usb/storage/usb.c
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@ -907,12 +907,9 @@ static int usb_stor_scan_thread(void * __us)
if (delay_use > 0) {
printk(KERN_DEBUG "usb-storage: waiting for device "
"to settle before scanning\n");
retry:
wait_event_interruptible_timeout(us->delay_wait,
wait_event_freezable_timeout(us->delay_wait,
test_bit(US_FLIDX_DISCONNECTING, &us->flags),
delay_use * HZ);
if (try_to_freeze())
goto retry;
}
/* If the device is still connected, perform the scanning */