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[PATCH] uml: lock the irqs_to_free list 

Fix (i.e. add some) the locking around the irqs_to_free list.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-02-10 01:43:55 -08:00 committed by Linus Torvalds
parent 894be2a485
commit 190c3e4563
1 changed files with 18 additions and 3 deletions
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21
arch/um/drivers/chan_kern.c
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@ -222,15 +222,28 @@ void enable_chan(struct line *line)
}
}
/* Items are added in IRQ context, when free_irq can't be called, and
* removed in process context, when it can.
* This handles interrupt sources which disappear, and which need to
* be permanently disabled. This is discovered in IRQ context, but
* the freeing of the IRQ must be done later.
*/
static DEFINE_SPINLOCK(irqs_to_free_lock);
static LIST_HEAD(irqs_to_free);
void free_irqs(void)
{
struct chan *chan;
LIST_HEAD(list);
struct list_head *ele;
while(!list_empty(&irqs_to_free)){
chan = list_entry(irqs_to_free.next, struct chan, free_list);
list_del(&chan->free_list);
spin_lock_irq(&irqs_to_free_lock);
list_splice_init(&irqs_to_free, &list);
INIT_LIST_HEAD(&irqs_to_free);
spin_unlock_irq(&irqs_to_free_lock);
list_for_each(ele, &list){
chan = list_entry(ele, struct chan, free_list);
if(chan->input)
free_irq(chan->line->driver->read_irq, chan);
@ -246,7 +259,9 @@ static void close_one_chan(struct chan *chan, int delay_free_irq)
return;
if(delay_free_irq){
spin_lock_irq(&irqs_to_free_lock);
list_add(&chan->free_list, &irqs_to_free);
spin_unlock_irq(&irqs_to_free_lock);
}
else {
if(chan->input)