diff options
author | Andrew Morton <akpm@osdl.org> | 2006-06-25 12:47:46 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 17:01:06 (GMT) |
commit | d616e09ab33aa4d013a93c9b393efd5cebf78521 (patch) | |
tree | 13837ef8dc9e955c621d798235c064218b56361d /mm/pdflush.c | |
parent | bc64863814b14a4f75884746e68d3bf9f96b3559 (diff) | |
download | linux-fsl-qoriq-d616e09ab33aa4d013a93c9b393efd5cebf78521.tar.xz |
[PATCH] pdflush: handle resume wakeups
pdflush is carefully designed to ensure that all wakeups have some
corresponding work to do - if a woken-up pdflush thread discovers that it
hasn't been given any work to do then this is considered an error.
That all broke when swsusp came along - because a timer-delivered wakeup to a
frozen pdflush thread will just get lost. This causes the pdflush thread to
get lost as well: the writeback timer is supposed to be re-armed by pdflush in
process context, but pdflush doesn't execute the callout which does this.
Fix that up by ignoring the return value from try_to_freeze(): jsut proceed,
see if we have any work pending and only go back to sleep if that is not the
case.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/pdflush.c')
-rw-r--r-- | mm/pdflush.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/mm/pdflush.c b/mm/pdflush.c index df7e50b..b02102f 100644 --- a/mm/pdflush.c +++ b/mm/pdflush.c @@ -104,21 +104,20 @@ static int __pdflush(struct pdflush_work *my_work) list_move(&my_work->list, &pdflush_list); my_work->when_i_went_to_sleep = jiffies; spin_unlock_irq(&pdflush_lock); - schedule(); - if (try_to_freeze()) { - spin_lock_irq(&pdflush_lock); - continue; - } - + try_to_freeze(); spin_lock_irq(&pdflush_lock); if (!list_empty(&my_work->list)) { - printk("pdflush: bogus wakeup!\n"); + /* + * Someone woke us up, but without removing our control + * structure from the global list. swsusp will do this + * in try_to_freeze()->refrigerator(). Handle it. + */ my_work->fn = NULL; continue; } if (my_work->fn == NULL) { - printk("pdflush: NULL work function\n"); + printk("pdflush: bogus wakeup\n"); continue; } spin_unlock_irq(&pdflush_lock); |