[SCSI] bnx2i: convert bnx2i_dev_lock to mutex

convert bnx2i_dev_lock to type mutex from rwlock_t because
cnic->register_device() can sleep for various reasons including memory
allocation, waiting for ISCSI_INIT completion and while acquiring mutex lock,
cnic_lock.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Anil Veerabhadrappa <anilgv@broadcom.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 25 insertions, 29 deletions

diff --git a/drivers/scsi/bnx2i/bnx2i_init.c b/drivers/scsi/bnx2i/bnx2i_init.c
index 2aeeeee3372d..fd78540ffc95 100644
--- a/drivers/scsi/bnx2i/bnx2i_init.c
+++ b/drivers/scsi/bnx2i/bnx2i_init.c
@@ -17,8 +17,8 @@ static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list);
 static u32 adapter_count;
 
 #define DRV_MODULE_NAME         "bnx2i"
-#define DRV_MODULE_VERSION      "2.0.1d"
-#define DRV_MODULE_RELDATE      "Mar 25, 2009"
+#define DRV_MODULE_VERSION      "2.0.1e"
+#define DRV_MODULE_RELDATE      "June 22, 2009"
 
 static char version[] __devinitdata =
                 "Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \
@@ -30,7 +30,7 @@ MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709 iSCSI Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_MODULE_VERSION);
 
-static DEFINE_RWLOCK(bnx2i_dev_lock);
+static DEFINE_MUTEX(bnx2i_dev_lock);
 
 unsigned int event_coal_div = 1;
 module_param(event_coal_div, int, 0664);
@@ -99,14 +99,14 @@ struct bnx2i_hba *get_adapter_list_head(void)
         if (!adapter_count)
                 goto hba_not_found;
 
-        read_lock(&bnx2i_dev_lock);
+        mutex_lock(&bnx2i_dev_lock);
         list_for_each_entry(tmp_hba, &adapter_list, link) {
                 if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) {
                         hba = tmp_hba;
                         break;
                 }
         }
-        read_unlock(&bnx2i_dev_lock);
+        mutex_unlock(&bnx2i_dev_lock);
 hba_not_found:
         return hba;
 }
@@ -121,14 +121,14 @@ struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic)
 {
         struct bnx2i_hba *hba, *temp;
 
-        read_lock(&bnx2i_dev_lock);
+        mutex_lock(&bnx2i_dev_lock);
         list_for_each_entry_safe(hba, temp, &adapter_list, link) {
                 if (hba->cnic == cnic) {
-                        read_unlock(&bnx2i_dev_lock);
+                        mutex_unlock(&bnx2i_dev_lock);
                         return hba;
                 }
         }
-        read_unlock(&bnx2i_dev_lock);
+        mutex_unlock(&bnx2i_dev_lock);
         return NULL;
 }
 
@@ -206,10 +206,10 @@ void bnx2i_reg_dev_all(void)
 {
         struct bnx2i_hba *hba, *temp;
 
-        read_lock(&bnx2i_dev_lock);
+        mutex_lock(&bnx2i_dev_lock);
         list_for_each_entry_safe(hba, temp, &adapter_list, link)
                 bnx2i_register_device(hba);
-        read_unlock(&bnx2i_dev_lock);
+        mutex_unlock(&bnx2i_dev_lock);
 }
 
 
@@ -246,10 +246,10 @@ void bnx2i_unreg_dev_all(void)
 {
         struct bnx2i_hba *hba, *temp;
 
-        read_lock(&bnx2i_dev_lock);
+        mutex_lock(&bnx2i_dev_lock);
         list_for_each_entry_safe(hba, temp, &adapter_list, link)
                 bnx2i_unreg_one_device(hba);
-        read_unlock(&bnx2i_dev_lock);
+        mutex_unlock(&bnx2i_dev_lock);
 }
 
 
@@ -258,19 +258,21 @@ void bnx2i_unreg_dev_all(void)
  * @hba:        bnx2i adapter instance
  * @cnic:       cnic device handle
  *
- * Global resource lock and host adapter lock is held during critical sections
- *      below. This routine is called from cnic_register_driver() context and
- *      work horse thread which does majority of device specific initialization
+ * Global resource lock is held during critical sections below. This routine is
+ *      called from either cnic_register_driver() or device hot plug context and
+ *      and does majority of device specific initialization
  */
 static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic)
 {
         int rc;
 
-        read_lock(&bnx2i_dev_lock);
+        mutex_lock(&bnx2i_dev_lock);
         rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba);
         if (!rc) {
                 hba->age++;
                 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
+                list_add_tail(&hba->link, &adapter_list);
+                adapter_count++;
         } else if (rc == -EBUSY)        /* duplicate registration */
                 printk(KERN_ALERT "bnx2i, duplicate registration"
                                   "hba=%p, cnic=%p\n", hba, cnic);
@@ -280,14 +282,8 @@ static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic)
                 printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI);
         else
                 printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc);
-        read_unlock(&bnx2i_dev_lock);
 
-        if (!rc) {
-                write_lock(&bnx2i_dev_lock);
-                list_add_tail(&hba->link, &adapter_list);
-                adapter_count++;
-                write_unlock(&bnx2i_dev_lock);
-        }
+        mutex_unlock(&bnx2i_dev_lock);
 
         return rc;
 }
@@ -337,7 +333,7 @@ void bnx2i_ulp_exit(struct cnic_dev *dev)
                                  "found, dev 0x%p\n", dev);
                 return;
         }
-        write_lock(&bnx2i_dev_lock);
+        mutex_lock(&bnx2i_dev_lock);
         list_del_init(&hba->link);
         adapter_count--;
 
@@ -345,7 +341,7 @@ void bnx2i_ulp_exit(struct cnic_dev *dev)
                 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
                 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
         }
-        write_unlock(&bnx2i_dev_lock);
+        mutex_unlock(&bnx2i_dev_lock);
 
         bnx2i_free_hba(hba);
 }
@@ -367,6 +363,8 @@ static int __init bnx2i_mod_init(void)
         if (!is_power_of_2(sq_size))
                 sq_size = roundup_pow_of_two(sq_size);
 
+        mutex_init(&bnx2i_dev_lock);
+
         bnx2i_scsi_xport_template =
                         iscsi_register_transport(&bnx2i_iscsi_transport);
         if (!bnx2i_scsi_xport_template) {
@@ -402,7 +400,7 @@ static void __exit bnx2i_mod_exit(void)
 {
         struct bnx2i_hba *hba;
 
-        write_lock(&bnx2i_dev_lock);
+        mutex_lock(&bnx2i_dev_lock);
         while (!list_empty(&adapter_list)) {
                 hba = list_entry(adapter_list.next, struct bnx2i_hba, link);
                 list_del(&hba->link);
@@ -413,11 +411,9 @@ static void __exit bnx2i_mod_exit(void)
                         clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
                 }
 
-                write_unlock(&bnx2i_dev_lock);
                 bnx2i_free_hba(hba);
-                write_lock(&bnx2i_dev_lock);
         }
-        write_unlock(&bnx2i_dev_lock);
+        mutex_unlock(&bnx2i_dev_lock);
 
         iscsi_unregister_transport(&bnx2i_iscsi_transport);
         cnic_unregister_driver(CNIC_ULP_ISCSI);