[PATCH][v2] virtio_fs: Remove redundant spinlock in virtio_fs_request_complete()

[lirongqing]

From: Li RongQing <lirongq...@baidu.com>

Since clear_bit is an atomic operation, the spinlock is redundant and
can be removed, reducing lock contention is good for performance.

Signed-off-by: Li RongQing <lirongq...@baidu.com>
---
Diff with v1: remove unused variable "fpq"

 fs/fuse/virtio_fs.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 53c2626..b8a99d3 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -762,7 +762,6 @@ static void copy_args_from_argbuf(struct fuse_args *args, 
struct fuse_req *req)
 static void virtio_fs_request_complete(struct fuse_req *req,
                                       struct virtio_fs_vq *fsvq)
 {
-       struct fuse_pqueue *fpq = &fsvq->fud->pq;
        struct fuse_args *args;
        struct fuse_args_pages *ap;
        unsigned int len, i, thislen;
@@ -791,9 +790,7 @@ static void virtio_fs_request_complete(struct fuse_req *req,
                }
        }
 
-       spin_lock(&fpq->lock);
        clear_bit(FR_SENT, &req->flags);
-       spin_unlock(&fpq->lock);
 
        fuse_request_end(req);
        spin_lock(&fsvq->lock);
-- 
2.9.4