scsi: kill command serial number

No users left, kill it.
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi.c

@@ -174,22 +174,6 @@ void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
 }
 #endif
 
-/**
- * scsi_cmd_get_serial - Assign a serial number to a command
- * @host: the scsi host
- * @cmd: command to assign serial number to
- *
- * Description: a serial number identifies a request for error recovery
- * and debugging purposes.  Protected by the Host_Lock of host.
- */
-void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd)
-{
-	cmd->serial_number = host->cmd_serial_number++;
-	if (cmd->serial_number == 0) 
-		cmd->serial_number = host->cmd_serial_number++;
-}
-EXPORT_SYMBOL(scsi_cmd_get_serial);
-
 /**
  * scsi_finish_command - cleanup and pass command back to upper layer
  * @cmd: the command

drivers/scsi/scsi_lib.c

@@ -316,7 +316,6 @@ EXPORT_SYMBOL(__scsi_execute);
  */
 static void scsi_init_cmd_errh(struct scsi_cmnd *cmd)
 {
-	cmd->serial_number = 0;
 	scsi_set_resid(cmd, 0);
 	memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 	if (cmd->cmd_len == 0)

include/scsi/scsi_cmnd.h

@@ -74,16 +74,6 @@ struct scsi_cmnd {
 
 	int eh_eflags;		/* Used by error handlr */
 
-	/*
-	 * A SCSI Command is assigned a nonzero serial_number before passed
-	 * to the driver's queue command function.  The serial_number is
-	 * cleared when scsi_done is entered indicating that the command
-	 * has been completed.  It is a bug for LLDDs to use this number
-	 * for purposes other than printk (and even that is only useful
-	 * for debugging).
-	 */
-	unsigned long serial_number;
-
 	/*
 	 * This is set to jiffies as it was when the command was first
 	 * allocated.  It is used to time how long the command has

include/scsi/scsi_host.h

@@ -486,7 +486,6 @@ struct scsi_host_template {
 		unsigned long irq_flags;				\
 		int rc;							\
 		spin_lock_irqsave(shost->host_lock, irq_flags);		\
-		scsi_cmd_get_serial(shost, cmd);			\
 		rc = func_name##_lck (cmd, cmd->scsi_done);			\
 		spin_unlock_irqrestore(shost->host_lock, irq_flags);	\
 		return rc;						\
@@ -596,12 +595,6 @@ struct Scsi_Host {
 	 * is nr_hw_queues * can_queue.
 	 */
 	unsigned nr_hw_queues;
-	/* 
-	 * Used to assign serial numbers to the cmds.
-	 * Protected by the host lock.
-	 */
-	unsigned long cmd_serial_number;
-	
 	unsigned active_mode:2;
 	unsigned unchecked_isa_dma:1;
 
@@ -738,7 +731,6 @@ extern int scsi_host_busy(struct Scsi_Host *shost);
 extern void scsi_host_put(struct Scsi_Host *t);
 extern struct Scsi_Host *scsi_host_lookup(unsigned short);
 extern const char *scsi_host_state_name(enum scsi_host_state);
-extern void scsi_cmd_get_serial(struct Scsi_Host *, struct scsi_cmnd *);
 
 static inline int __must_check scsi_add_host(struct Scsi_Host *host,
 					     struct device *dev)