nfs: Don't busy-wait on SIGKILL in __nfs_iocounter_wait

If a SIGKILL is sent to a task waiting in __nfs_iocounter_wait,
it will busy-wait or soft lockup in its while loop.
nfs_wait_bit_killable won't sleep, and the loop won't exit on
the error return.

Stop the busy-wait by breaking out of the loop when
nfs_wait_bit_killable returns an error.

Signed-off-by: David Jeffery <djeffery@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 932c6cc27a76..be7cbce6e4c7 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -116,7 +116,7 @@ __nfs_iocounter_wait(struct nfs_io_counter *c)
                 if (atomic_read(&c->io_count) == 0)
                         break;
                 ret = nfs_wait_bit_killable(&q.key);
-        } while (atomic_read(&c->io_count) != 0);
+        } while (atomic_read(&c->io_count) != 0 && !ret);
         finish_wait(wq, &q.wait);
         return ret;
 }