Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=190c3e456325942a17785332fe15b68eeb3775ca
Commit: 190c3e456325942a17785332fe15b68eeb3775ca
Parent: 894be2a485b75bce9a4d45d3e431aafd4c89f1ea
Author: Jeff Dike <[EMAIL PROTECTED]>
AuthorDate: Sat Feb 10 01:43:55 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sun Feb 11 10:51:21 2007 -0800
[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 <[EMAIL PROTECTED]>
Cc: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
arch/um/drivers/chan_kern.c | 21 ++++++++++++++++++---
1 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 4e7e3cf..bce9b34 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -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;
+
+ 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);
- while(!list_empty(&irqs_to_free)){
- chan = list_entry(irqs_to_free.next, struct chan, free_list);
- list_del(&chan->free_list);
+ 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)
-
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