[PATCH] fix request->cmd == INT cases

- I have unearthed very old bugs in stale drivers that still
   used request->cmd as a READ|WRITE int
 - This patch is maybe a proof that these drivers have not been
   used for a long time. Should they be removed completely?

Drivers that currently do not work for sure:
 drivers/acorn/block/fd1772.c |    2 +-
 drivers/acorn/block/mfmhd.c  |    8 ++++----
 drivers/cdrom/aztcd.c        |    2 +-
 drivers/cdrom/cm206.c        |    2 +-
 drivers/cdrom/gscd.c         |    2 +-
 drivers/cdrom/mcdx.c         |    2 +-
 drivers/cdrom/optcd.c        |    2 +-
 drivers/cdrom/sjcd.c         |    2 +-

Drivers with cosmetic fixes only:
  b/drivers/block/amiflop.c
  b/drivers/block/nbd.c
  b/drivers/ide/legacy/hd.c

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

drivers/cdrom/aztcd.c

@@ -229,7 +229,7 @@ static struct request_queue *azt_queue;
 static int current_valid(void)
 {
         return CURRENT &&
-		CURRENT->cmd == READ &&
+		rq_data_dir(CURRENT) == READ &&
 		CURRENT->sector != -1;
 }
 

drivers/cdrom/cm206.c

@@ -851,7 +851,7 @@ static void do_cm206_request(request_queue_t * q)
 		if (!req)
 			return;
 
-		if (req->cmd != READ) {
+		if (rq_data_dir(req) != READ) {
 			debug(("Non-read command %d on cdrom\n", req->cmd));
 			end_request(req, 0);
 			continue;

drivers/cdrom/gscd.c

@@ -264,7 +264,7 @@ repeat:
 	if (req->sector == -1)
 		goto out;
 
-	if (req->cmd != READ) {
+	if (rq_data_dir(req) != READ) {
 		printk("GSCD: bad cmd %u\n", rq_data_dir(req));
 		end_request(req, 0);
 		goto repeat;

drivers/cdrom/mcdx.c

@@ -596,7 +596,7 @@ static void do_mcdx_request(request_queue_t * q)
 	xtrace(REQUEST, "do_request() (%lu + %lu)\n",
 	       req->sector, req->nr_sectors);
 
-	if (req->cmd != READ) {
+	if (rq_data_dir(req) != READ) {
 		xwarn("do_request(): non-read command to cd!!\n");
 		xtrace(REQUEST, "end_request(0): write\n");
 		end_request(req, 0);

drivers/cdrom/optcd.c

@@ -977,7 +977,7 @@ static int update_toc(void)
 static int current_valid(void)
 {
         return CURRENT &&
-		CURRENT->cmd == READ &&
+		rq_data_dir(CURRENT) == READ &&
 		CURRENT->sector != -1;
 }
 

drivers/cdrom/sjcd.c

@@ -1064,7 +1064,7 @@ static void sjcd_invalidate_buffers(void)
 static int current_valid(void)
 {
         return CURRENT &&
-		CURRENT->cmd == READ &&
+		rq_data_dir(CURRENT) == READ &&
 		CURRENT->sector != -1;
 }