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>

1 files changed, 6 insertions, 4 deletions

diff --git a/net/9p/client.c b/net/9p/client.c
index 67717f69412e..f4e6c05b3c68 100644
--- a/net/9p/client.c
+++ b/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);
 }