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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>
This commit is contained in:
Jon Mason 2013-01-19 02:02:19 -07:00 committed by Greg Kroah-Hartman
parent ef114ed506
commit 7b4f2d3c3b
1 changed files with 17 additions and 3 deletions
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20
drivers/ntb/ntb_transport.c
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@ -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);