[SCSI] aic7xxx: remove some dead wood

especially the now dead scsi_cmnd overlay
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aic7xxx/aic7xxx.h

@@ -346,7 +346,6 @@ typedef enum {
 					  * controller.
 					  */
 	AHC_NEWEEPROM_FMT     = 0x4000,
-	AHC_RESOURCE_SHORTAGE = 0x8000,
 	AHC_TQINFIFO_BLOCKED  = 0x10000,  /* Blocked waiting for ATIOs */
 	AHC_INT50_SPEEDFLEX   = 0x20000,  /*
 					   * Internal 50pin connector

drivers/scsi/aic7xxx/aic7xxx_osm.c

@@ -500,17 +500,6 @@ ahc_linux_detect(struct scsi_host_template *template)
 	struct	ahc_softc *ahc;
 	int     found = 0;
 
-	/*
-	 * Sanity checking of Linux SCSI data structures so
-	 * that some of our hacks^H^H^H^H^Hassumptions aren't
-	 * violated.
-	 */
-	if (offsetof(struct ahc_cmd_internal, end)
-	  > offsetof(struct scsi_cmnd, host_scribble)) {
-		printf("ahc_linux_detect: SCSI data structures changed.\n");
-		printf("ahc_linux_detect: Unable to attach\n");
-		return (0);
-	}
 	/*
 	 * If we've been passed any parameters, process them now.
 	 */
@@ -1587,10 +1576,9 @@ ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
 	/*
 	 * Get an scb to use.
 	 */
-	if ((scb = ahc_get_scb(ahc)) == NULL) {
-			ahc->flags |= AHC_RESOURCE_SHORTAGE;
-			return SCSI_MLQUEUE_HOST_BUSY;
-	}
+	scb = ahc_get_scb(ahc);
+	if (!scb)
+		return SCSI_MLQUEUE_HOST_BUSY;
 
 	scb->io_ctx = cmd;
 	scb->platform_data->dev = dev;

drivers/scsi/aic7xxx/aic7xxx_osm.h

@@ -268,35 +268,6 @@ ahc_scb_timer_reset(struct scb *scb, u_int usec)
 
 #define AIC7XXX_DRIVER_VERSION "6.2.36"
 
-/**************************** Front End Queues ********************************/
-/*
- * Data structure used to cast the Linux struct scsi_cmnd to something
- * that allows us to use the queue macros.  The linux structure has
- * plenty of space to hold the links fields as required by the queue
- * macros, but the queue macors require them to have the correct type.
- */
-struct ahc_cmd_internal {
-	/* Area owned by the Linux scsi layer. */
-	uint8_t	private[offsetof(struct scsi_cmnd, SCp.Status)];
-	union {
-		STAILQ_ENTRY(ahc_cmd)	ste;
-		LIST_ENTRY(ahc_cmd)	le;
-		TAILQ_ENTRY(ahc_cmd)	tqe;
-	} links;
-	uint32_t			end;
-};
-
-struct ahc_cmd {
-	union {
-		struct ahc_cmd_internal	icmd;
-		struct scsi_cmnd	scsi_cmd;
-	} un;
-};
-
-#define acmd_icmd(cmd) ((cmd)->un.icmd)
-#define acmd_scsi_cmd(cmd) ((cmd)->un.scsi_cmd)
-#define acmd_links un.icmd.links
-
 /*************************** Device Data Structures ***************************/
 /*
  * A per probed device structure used to deal with some error recovery
@@ -305,7 +276,6 @@ struct ahc_cmd {
  * after a successfully completed inquiry command to the target when
  * that inquiry data indicates a lun is present.
  */
-TAILQ_HEAD(ahc_busyq, ahc_cmd);
 typedef enum {
 	AHC_DEV_FREEZE_TIL_EMPTY = 0x02, /* Freeze queue until active == 0 */
 	AHC_DEV_Q_BASIC		 = 0x10, /* Allow basic device queuing */
@@ -900,7 +870,6 @@ ahc_notify_xfer_settings_change(struct ahc_softc *ahc,
 static __inline void
 ahc_platform_scb_free(struct ahc_softc *ahc, struct scb *scb)
 {
-	ahc->flags &= ~AHC_RESOURCE_SHORTAGE;
 }
 
 int	ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg);