[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
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -819,12 +819,15 @@
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 @@
/* 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);
}