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Subject[PATCH 4.4 101/312] xprtrdma: Fix additional uses of spin_lock_irqsave(rb_lock)
Date
From: Chuck Lever <chuck.lever@oracle.com>

commit 9b06688bc3b9f13f8de90f832c455fddec3d4e8a upstream.

Clean up.

rb_lock critical sections added in rpcrdma_ep_post_extra_recv()
should have first been converted to use normal spin_lock now that
the reply handler is a work queue.

The backchannel set up code should use the appropriate helper
instead of open-coding a rb_recv_bufs list add.

Problem introduced by glib patch re-ordering on my part.

Fixes: f531a5dbc451 ('xprtrdma: Pre-allocate backward rpc_rqst')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/sunrpc/xprtrdma/backchannel.c | 6 +-----
net/sunrpc/xprtrdma/verbs.c | 7 +++----
2 files changed, 4 insertions(+), 9 deletions(-)

--- a/net/sunrpc/xprtrdma/backchannel.c
+++ b/net/sunrpc/xprtrdma/backchannel.c
@@ -84,9 +84,7 @@ out_fail:
static int rpcrdma_bc_setup_reps(struct rpcrdma_xprt *r_xprt,
unsigned int count)
{
- struct rpcrdma_buffer *buffers = &r_xprt->rx_buf;
struct rpcrdma_rep *rep;
- unsigned long flags;
int rc = 0;

while (count--) {
@@ -98,9 +96,7 @@ static int rpcrdma_bc_setup_reps(struct
break;
}

- spin_lock_irqsave(&buffers->rb_lock, flags);
- list_add(&rep->rr_list, &buffers->rb_recv_bufs);
- spin_unlock_irqrestore(&buffers->rb_lock, flags);
+ rpcrdma_recv_buffer_put(rep);
}

return rc;
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1337,15 +1337,14 @@ rpcrdma_ep_post_extra_recv(struct rpcrdm
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct rpcrdma_ep *ep = &r_xprt->rx_ep;
struct rpcrdma_rep *rep;
- unsigned long flags;
int rc;

while (count--) {
- spin_lock_irqsave(&buffers->rb_lock, flags);
+ spin_lock(&buffers->rb_lock);
if (list_empty(&buffers->rb_recv_bufs))
goto out_reqbuf;
rep = rpcrdma_buffer_get_rep_locked(buffers);
- spin_unlock_irqrestore(&buffers->rb_lock, flags);
+ spin_unlock(&buffers->rb_lock);

rc = rpcrdma_ep_post_recv(ia, ep, rep);
if (rc)
@@ -1355,7 +1354,7 @@ rpcrdma_ep_post_extra_recv(struct rpcrdm
return 0;

out_reqbuf:
- spin_unlock_irqrestore(&buffers->rb_lock, flags);
+ spin_unlock(&buffers->rb_lock);
pr_warn("%s: no extra receive buffers\n", __func__);
return -ENOMEM;


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