[SCSI] megaraid (legacy): remove scsi_assign_lock usage

just take the adapter lock in megaraid_queue.  Additional benefit is
that we can get rid of the awkward conditional locking in
mega_internal_command.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/megaraid.c

@@ -362,6 +362,7 @@ megaraid_queue(Scsi_Cmnd *scmd, void (*done)(Scsi_Cmnd *))
 	adapter_t	*adapter;
 	scb_t	*scb;
 	int	busy=0;
+	unsigned long flags;
 
 	adapter = (adapter_t *)scmd->device->host->hostdata;
 
@@ -377,6 +378,7 @@ megaraid_queue(Scsi_Cmnd *scmd, void (*done)(Scsi_Cmnd *))
 	 * return 0 in that case.
 	 */
 
+	spin_lock_irqsave(&adapter->lock, flags);
 	scb = mega_build_cmd(adapter, scmd, &busy);
 
 	if(scb) {
@@ -393,6 +395,7 @@ megaraid_queue(Scsi_Cmnd *scmd, void (*done)(Scsi_Cmnd *))
 		}
 		return 0;
 	}
+	spin_unlock_irqrestore(&adapter->lock, flags);
 
 	return busy;
 }
@@ -1981,7 +1984,7 @@ megaraid_reset(struct scsi_cmnd *cmd)
 	mc.cmd = MEGA_CLUSTER_CMD;
 	mc.opcode = MEGA_RESET_RESERVATIONS;
 
-	if( mega_internal_command(adapter, LOCK_INT, &mc, NULL) != 0 ) {
+	if( mega_internal_command(adapter, &mc, NULL) != 0 ) {
 		printk(KERN_WARNING
 				"megaraid: reservation reset failed.\n");
 	}
@@ -3011,7 +3014,7 @@ proc_rdrv(adapter_t *adapter, char *page, int start, int end )
 		mc.cmd = FC_NEW_CONFIG;
 		mc.opcode = OP_DCMD_READ_CONFIG;
 
-		if( mega_internal_command(adapter, LOCK_INT, &mc, NULL) ) {
+		if( mega_internal_command(adapter, &mc, NULL) ) {
 
 			len = sprintf(page, "40LD read config failed.\n");
 
@@ -3029,11 +3032,11 @@ proc_rdrv(adapter_t *adapter, char *page, int start, int end )
 	else {
 		mc.cmd = NEW_READ_CONFIG_8LD;
 
-		if( mega_internal_command(adapter, LOCK_INT, &mc, NULL) ) {
+		if( mega_internal_command(adapter, &mc, NULL) ) {
 
 			mc.cmd = READ_CONFIG_8LD;
 
-			if( mega_internal_command(adapter, LOCK_INT, &mc,
+			if( mega_internal_command(adapter, &mc,
 						NULL) ){
 
 				len = sprintf(page,
@@ -3632,7 +3635,7 @@ megadev_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
 			/*
 			 * Issue the command
 			 */
-			mega_internal_command(adapter, LOCK_INT, &mc, pthru);
+			mega_internal_command(adapter, &mc, pthru);
 
 			rval = mega_n_to_m((void __user *)arg, &mc);
 
@@ -3715,7 +3718,7 @@ megadev_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
 			/*
 			 * Issue the command
 			 */
-			mega_internal_command(adapter, LOCK_INT, &mc, NULL);
+			mega_internal_command(adapter, &mc, NULL);
 
 			rval = mega_n_to_m((void __user *)arg, &mc);
 
@@ -4234,7 +4237,7 @@ mega_do_del_logdrv(adapter_t *adapter, int logdrv)
 	mc.opcode = OP_DEL_LOGDRV;
 	mc.subopcode = logdrv;
 
-	rval = mega_internal_command(adapter, LOCK_INT, &mc, NULL);
+	rval = mega_internal_command(adapter, &mc, NULL);
 
 	/* log this event */
 	if(rval) {
@@ -4367,7 +4370,7 @@ mega_adapinq(adapter_t *adapter, dma_addr_t dma_handle)
 
 	mc.xferaddr = (u32)dma_handle;
 
-	if ( mega_internal_command(adapter, LOCK_INT, &mc, NULL) != 0 ) {
+	if ( mega_internal_command(adapter, &mc, NULL) != 0 ) {
 		return -1;
 	}
 
@@ -4435,7 +4438,7 @@ mega_internal_dev_inquiry(adapter_t *adapter, u8 ch, u8 tgt,
 	mc.cmd = MEGA_MBOXCMD_PASSTHRU;
 	mc.xferaddr = (u32)pthru_dma_handle;
 
-	rval = mega_internal_command(adapter, LOCK_INT, &mc, pthru);
+	rval = mega_internal_command(adapter, &mc, pthru);
 
 	pci_free_consistent(pdev, sizeof(mega_passthru), pthru,
 			pthru_dma_handle);
@@ -4449,7 +4452,6 @@ mega_internal_dev_inquiry(adapter_t *adapter, u8 ch, u8 tgt,
 /**
  * mega_internal_command()
  * @adapter - pointer to our soft state
- * @ls - the scope of the exclusion lock.
  * @mc - the mailbox command
  * @pthru - Passthru structure for DCDB commands
  *
@@ -4463,8 +4465,7 @@ mega_internal_dev_inquiry(adapter_t *adapter, u8 ch, u8 tgt,
  * Note: parameter 'pthru' is null for non-passthru commands.
  */
 static int
-mega_internal_command(adapter_t *adapter, lockscope_t ls, megacmd_t *mc,
-		mega_passthru *pthru )
+mega_internal_command(adapter_t *adapter, megacmd_t *mc, mega_passthru *pthru)
 {
 	Scsi_Cmnd	*scmd;
 	struct	scsi_device *sdev;
@@ -4508,15 +4509,8 @@ mega_internal_command(adapter_t *adapter, lockscope_t ls, megacmd_t *mc,
 
 	scb->idx = CMDID_INT_CMDS;
 
-	/*
-	 * Get the lock only if the caller has not acquired it already
-	 */
-	if( ls == LOCK_INT ) spin_lock_irqsave(&adapter->lock, flags);
-
 	megaraid_queue(scmd, mega_internal_done);
 
-	if( ls == LOCK_INT ) spin_unlock_irqrestore(&adapter->lock, flags);
-
 	wait_for_completion(&adapter->int_waitq);
 
 	rval = scmd->result;

drivers/scsi/megaraid.h

@@ -925,13 +925,6 @@ struct mega_hbas {
 #define MEGA_BULK_DATA			0x0001
 #define MEGA_SGLIST			0x0002
 
-/*
- * lockscope definitions, callers can specify the lock scope with this data
- * type. LOCK_INT would mean the caller has not acquired the lock before
- * making the call and LOCK_EXT would mean otherwise.
- */
-typedef enum { LOCK_INT, LOCK_EXT } lockscope_t;
-
 /*
  * Parameters for the io-mapped controllers
  */
@@ -1062,8 +1055,7 @@ static int mega_support_random_del(adapter_t *);
 static int mega_del_logdrv(adapter_t *, int);
 static int mega_do_del_logdrv(adapter_t *, int);
 static void mega_get_max_sgl(adapter_t *);
-static int mega_internal_command(adapter_t *, lockscope_t, megacmd_t *,
-		mega_passthru *);
+static int mega_internal_command(adapter_t *, megacmd_t *, mega_passthru *);
 static void mega_internal_done(Scsi_Cmnd *);
 static int mega_support_cluster(adapter_t *);
 #endif