The patch titled
uml: lock the irqs_to_free list
has been added to the -mm tree. Its filename is
uml-lock-the-irqs_to_free-list.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: uml: lock the irqs_to_free list
From: Jeff Dike <jdike@xxxxxxxxxxx>
Fix (i.e. add some) the locking around the irqs_to_free list.
Signed-off-by: Jeff Dike <jdike@xxxxxxxxxxx>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/um/drivers/chan_kern.c | 21 ++++++++++++++++++---
1 files changed, 18 insertions(+), 3 deletions(-)
diff -puN arch/um/drivers/chan_kern.c~uml-lock-the-irqs_to_free-list arch/um/drivers/chan_kern.c
--- a/arch/um/drivers/chan_kern.c~uml-lock-the-irqs_to_free-list
+++ a/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 *
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)
_
Patches currently in -mm which might be from jdike@xxxxxxxxxxx are
x86_64-i386-kernel-mode-faults-pollute-current-thead.patch
uml-console-locking-fixes.patch
uml-return-hotplug-errors-to-host.patch
uml-console-whitespace-and-comment-tidying.patch
uml-lock-the-irqs_to_free-list.patch
uml-add-locking-to-network-transport-registration.patch
uml-network-driver-whitespace-and-style-fixes.patch
uml-fix-prototypes.patch
rewrite-unnecessary-duplicated-code-to-use-field_sizeof.patch
-
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