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[PATCH] uml: irq locking fixes

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As the comment immediately preceding this points out, this list is changed in
irq context, so it needs to be protected with spin_lock_irqsave in process
context when it is processed.

Sometimes, gcc should just compile the comments and forget the code.

The IRQ side of this was better, in the sense that it blocked and unblocked
interrupts, but it still should have saved and restored them.

Signed-off-by: Jeff Dike <jdike@linux.intel.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 2007-03-29 01:20:30 -07:00 committed by Linus Torvalds
parent 602ed87ecd
commit 3076212f8d
1 changed files with 7 additions and 5 deletions
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12
arch/um/drivers/chan_kern.c
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@ -236,11 +236,11 @@ void free_irqs(void)
struct chan *chan;
LIST_HEAD(list);
struct list_head *ele;
unsigned long flags;
spin_lock_irq(&irqs_to_free_lock);
spin_lock_irqsave(&irqs_to_free_lock, flags);
list_splice_init(&irqs_to_free, &list);
INIT_LIST_HEAD(&irqs_to_free);
spin_unlock_irq(&irqs_to_free_lock);
spin_unlock_irqrestore(&irqs_to_free_lock, flags);
list_for_each(ele, &list){
chan = list_entry(ele, struct chan, free_list);
@ -255,13 +255,15 @@ void free_irqs(void)
static void close_one_chan(struct chan *chan, int delay_free_irq)
{
unsigned long flags;
if(!chan->opened)
return;
if(delay_free_irq){
spin_lock_irq(&irqs_to_free_lock);
spin_lock_irqsave(&irqs_to_free_lock, flags);
list_add(&chan->free_list, &irqs_to_free);
spin_unlock_irq(&irqs_to_free_lock);
spin_unlock_irqrestore(&irqs_to_free_lock, flags);
}
else {
if(chan->input)