From: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
xprt_alloc_bc_request() is always called in soft interrupt context.
Grab the spin_lock instead of the bottom half spin_lock. Softirqs
do not preempt other softirqs running on the same processor, so there
is no need to disable bottom halves.
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
net/sunrpc/backchannel_rqst.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c
index 5a7d342..553621f 100644
--- a/net/sunrpc/backchannel_rqst.c
+++ b/net/sunrpc/backchannel_rqst.c
@@ -211,6 +211,9 @@ EXPORT_SYMBOL(xprt_destroy_backchannel);
* has been preallocated as well. Use xprt_alloc_bc_request to allocate
* to this request. Use xprt_free_bc_request to return it.
*
+ * We know that we're called in soft interrupt context, grab the spin_lock
+ * since there is no need to grab the bottom half spin_lock.
+ *
* Return an available rpc_rqst, otherwise NULL if non are available.
*/
struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt)
@@ -218,7 +221,7 @@ struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt)
struct rpc_rqst *req;
dprintk("RPC: allocate a backchannel request\n");
- spin_lock_bh(&xprt->bc_pa_lock);
+ spin_lock(&xprt->bc_pa_lock);
if (!list_empty(&xprt->bc_pa_list)) {
req = list_first_entry(&xprt->bc_pa_list, struct rpc_rqst,
rq_bc_pa_list);
@@ -226,7 +229,7 @@ struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt)
} else {
req = NULL;
}
- spin_unlock_bh(&xprt->bc_pa_lock);
+ spin_unlock(&xprt->bc_pa_lock);
if (req != NULL) {
set_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
--
1.6.3.1
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