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SUNRPC: allow svc_recv to break out of 500ms sleep when alloc_page fails 

svc_recv() calls alloc_page(), and if it fails it does a 500ms
uninterruptible sleep and then reattempts. There doesn't seem to be any
real reason for this to be uninterruptible, so change it to an
interruptible sleep. Also check for kthread_stop() and signalled() after
setting the task state to avoid races that might lead to sleeping after
kthread_stop() wakes up the task.

I've done some very basic smoke testing with this, but obviously it's
hard to test the actual changes since this all depends on an
alloc_page() call failing.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Jeff Layton 2008-02-12 11:47:24 -05:00 committed by J. Bruce Fields
parent 6aaa67b5f3
commit 7b54fe61ff
1 changed files with 5 additions and 3 deletions
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8
net/sunrpc/svc_xprt.c
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@ -587,10 +587,12 @@ int svc_recv(struct svc_rqst *rqstp, long timeout)
while (rqstp->rq_pages[i] == NULL) {
struct page *p = alloc_page(GFP_KERNEL);
if (!p) {
int j = msecs_to_jiffies(500);
if (kthread_should_stop())
set_current_state(TASK_INTERRUPTIBLE);
if (signalled() || kthread_should_stop()) {
set_current_state(TASK_RUNNING);
return -EINTR;
schedule_timeout_uninterruptible(j);
}
schedule_timeout(msecs_to_jiffies(500));
}
rqstp->rq_pages[i] = p;
}