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[PATCH] uml: use GFP_ATOMIC for allocations under spinlocks.

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setup_initial_poll is only called with sigio_lock() held, so use appropriate
allocation.

Also, parse_chan() can also be called when holding a spinlock (see line_open()
 -> parse_chan_pair()).

I have sporadic problems (spinlock taken twice, with spinlock debugging on UP)
which could be caused by a sequence like "take spinlock, alloc and go to
sleep, take again the spinlock in the other thread".

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2005-09-22 21:44:21 -07:00 committed by Linus Torvalds
parent 46db4a42dd
commit 79ae2cb856
2 changed files with 2 additions and 2 deletions
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2
arch/um/drivers/chan_kern.c
View File

@ -465,7 +465,7 @@ static struct chan *parse_chan(char *str, int pri, int device,
data = (*ops->init)(str, device, opts);
if(data == NULL) return(NULL);
chan = kmalloc(sizeof(*chan), GFP_KERNEL);
chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
if(chan == NULL) return(NULL);
*chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
.primary = 1,

2
arch/um/kernel/sigio_user.c
View File

@ -340,7 +340,7 @@ static int setup_initial_poll(int fd)
{
struct pollfd *p;
p = um_kmalloc(sizeof(struct pollfd));
p = um_kmalloc_atomic(sizeof(struct pollfd));
if(p == NULL){
printk("setup_initial_poll : failed to allocate poll\n");
return(-1);