[PATCH 05/21] NTB: No sleeping in interrupt context

[Jon Mason]

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.ma...@intel.com>
---
 drivers/ntb/ntb_transport.c |   20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 2823087..bf7ade1 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);
-- 
1.7.9.5

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