NTB: No sleeping in interrupt context

Move all cancel_delayed_work_sync to a work thread to prevent sleeping
in interrupt context (when the NTB link goes down).  Caught via
'Sleep inside atomic section checking'

Signed-off-by: Jon Mason <jon.mason@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 17 insertions, 3 deletions

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 2823087a1338..bf7ade14c742 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -110,6 +110,7 @@ struct ntb_transport_qp {
 
         void (*event_handler) (void *data, int status);
         struct delayed_work link_work;
+        struct work_struct link_cleanup;
 
         struct dentry *debugfs_dir;
         struct dentry *debugfs_stats;
@@ -148,6 +149,7 @@ struct ntb_transport {
         unsigned long qp_bitmap;
         bool transport_link;
         struct delayed_work link_work;
+        struct work_struct link_cleanup;
         struct dentry *debugfs_dir;
 };
 
@@ -510,8 +512,11 @@ static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size)
         return 0;
 }
 
-static void ntb_qp_link_down(struct ntb_transport_qp *qp)
+static void ntb_qp_link_cleanup(struct work_struct *work)
 {
+        struct ntb_transport_qp *qp = container_of(work,
+                                                   struct ntb_transport_qp,
+                                                   link_cleanup);
         struct ntb_transport *nt = qp->transport;
         struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
 
@@ -531,8 +536,15 @@ static void ntb_qp_link_down(struct ntb_transport_qp *qp)
                                       msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
 }
 
-static void ntb_transport_conn_down(struct ntb_transport *nt)
+static void ntb_qp_link_down(struct ntb_transport_qp *qp)
+{
+        schedule_work(&qp->link_cleanup);
+}
+
+static void ntb_transport_link_cleanup(struct work_struct *work)
 {
+        struct ntb_transport *nt = container_of(work, struct ntb_transport,
+                                                link_cleanup);
         int i;
 
         if (nt->transport_link == NTB_LINK_DOWN)
@@ -562,7 +574,7 @@ static void ntb_transport_event_callback(void *data, enum ntb_hw_event event)
                 schedule_delayed_work(&nt->link_work, 0);
                 break;
         case NTB_EVENT_HW_LINK_DOWN:
-                ntb_transport_conn_down(nt);
+                schedule_work(&nt->link_cleanup);
                 break;
         default:
                 BUG();
@@ -769,6 +781,7 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
         }
 
         INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work);
+        INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup);
 
         spin_lock_init(&qp->ntb_rx_pend_q_lock);
         spin_lock_init(&qp->ntb_rx_free_q_lock);
@@ -814,6 +827,7 @@ int ntb_transport_init(struct pci_dev *pdev)
                 ntb_transport_init_queue(nt, i);
 
         INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work);
+        INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup);
 
         rc = ntb_register_event_callback(nt->ndev,
                                          ntb_transport_event_callback);