9p: Make all client spin locks IRQ safe

The client lock must be IRQ safe. Some of the lock acquisition paths
took regular spin locks.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

net/9p/client.c

@@ -613,6 +613,7 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 {
 	int err;
 	struct p9_fid *fid;
+	unsigned long flags;
 
 	P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 	fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
@@ -632,9 +633,9 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 	fid->clnt = clnt;
 	fid->aux = NULL;
 
-	spin_lock(&clnt->lock);
+	spin_lock_irqsave(&clnt->lock, flags);
 	list_add(&fid->flist, &clnt->fidlist);
-	spin_unlock(&clnt->lock);
+	spin_unlock_irqrestore(&clnt->lock, flags);
 
 	return fid;
 
@@ -646,13 +647,14 @@ error:
 static void p9_fid_destroy(struct p9_fid *fid)
 {
 	struct p9_client *clnt;
+	unsigned long flags;
 
 	P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 	clnt = fid->clnt;
 	p9_idpool_put(fid->fid, clnt->fidpool);
-	spin_lock(&clnt->lock);
+	spin_lock_irqsave(&clnt->lock, flags);
 	list_del(&fid->flist);
-	spin_unlock(&clnt->lock);
+	spin_unlock_irqrestore(&clnt->lock, flags);
 	kfree(fid);
 }