[SCSI] FW: [PATCH] for Deadlock in transport_fc

Cannot call fc_rport_terminate() under the host lock, so drop the
lock.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 2cab556..771e97e 100644 (file)
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -819,12 +819,15 @@ show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
        return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
 }
 
+#define get_list_head_entry(pos, head, member)                 \
+       pos = list_entry((head)->next, typeof(*pos), member)
+
 static ssize_t
 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
        const char *buf, size_t count)
 {
        struct Scsi_Host *shost = transport_class_to_shost(cdev);
-       struct fc_rport *rport, *next_rport;
+       struct fc_rport *rport;
        enum fc_tgtid_binding_type val;
        unsigned long flags;
 
@@ -834,9 +837,13 @@ store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
        /* if changing bind type, purge all unused consistent bindings */
        if (val != fc_host_tgtid_bind_type(shost)) {
                spin_lock_irqsave(shost->host_lock, flags);
-               list_for_each_entry_safe(rport, next_rport,
-                               &fc_host_rport_bindings(shost), peers)
+               while (!list_empty(&fc_host_rport_bindings(shost))) {
+                       get_list_head_entry(rport,
+                               &fc_host_rport_bindings(shost), peers);
+                       spin_unlock_irqrestore(shost->host_lock, flags);
                        fc_rport_terminate(rport);
+                       spin_lock_irqsave(shost->host_lock, flags);
+               }
                spin_unlock_irqrestore(shost->host_lock, flags);
        }