ide-cd: merge cdrom_write_check_ireason() and cdrom_read_check_ireason()

Add 'rw' parameter to cdrom_read_check_ireason(), make it handle
both read and write checking, rename it to ide_cd_check_ireason(),
finally remove no longer needed cdrom_write_check_ireason().

There should be no functionality changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 15 insertions, 49 deletions

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 50f78eb7dce9..9d2e458250ba 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -683,21 +683,25 @@ static void cdrom_buffer_sectors (ide_drive_t *drive, unsigned long sector,
  * ok; nonzero if the request has been terminated.
  */
 static
-int cdrom_read_check_ireason (ide_drive_t *drive, int len, int ireason)
+int ide_cd_check_ireason(ide_drive_t *drive, int len, int ireason, int rw)
 {
-        if (ireason == 2)
+        /*
+         * ireason == 0: the drive wants to receive data from us
+         * ireason == 2: the drive is expecting to transfer data to us
+         */
+        if (ireason == (!rw << 1))
                 return 0;
-        else if (ireason == 0) {
+        else if (ireason == (rw << 1)) {
                 ide_hwif_t *hwif = drive->hwif;
+                xfer_func_t *xf;
 
-                /* Whoops... The drive is expecting to receive data from us! */
+                /* Whoops... */
                 printk(KERN_ERR "%s: %s: wrong transfer direction!\n",
                                 drive->name, __FUNCTION__);
 
-                /* Throw some data at the drive so it doesn't hang
-                   and quit this request. */
-                ide_cd_pad_transfer(drive, hwif->atapi_output_bytes, len);
-        } else  if (ireason == 1) {
+                xf = rw ? hwif->atapi_output_bytes : hwif->atapi_input_bytes;
+                ide_cd_pad_transfer(drive, xf, len);
+        } else  if (rw == 0 && ireason == 1) {
                 /* Some drives (ASUS) seem to tell us that status
                  * info is available. just get it and ignore.
                  */
@@ -985,35 +989,6 @@ int ide_cd_queue_pc(ide_drive_t *drive, struct request *rq)
 }
 
 /*
- * Write handling
- */
-static int cdrom_write_check_ireason(ide_drive_t *drive, int len, int ireason)
-{
-        /* Two notes about IDE interrupt reason here - 0 means that
-         * the drive wants to receive data from us, 2 means that
-         * the drive is expecting to transfer data to us.
-         */
-        if (ireason == 0)
-                return 0;
-        else if (ireason == 2) {
-                ide_hwif_t *hwif = drive->hwif;
-
-                /* Whoops... The drive wants to send data. */
-                printk(KERN_ERR "%s: %s: wrong transfer direction!\n",
-                                drive->name, __FUNCTION__);
-
-                ide_cd_pad_transfer(drive, hwif->atapi_input_bytes, len);
-        } else {
-                /* Drive wants a command packet, or invalid ireason... */
-                printk(KERN_ERR "%s: %s: bad interrupt reason 0x%02x\n",
-                                drive->name, __FUNCTION__, ireason);
-        }
-
-        cdrom_end_request(drive, 0);
-        return 1;
-}
-
-/*
  * Called from blk_end_request_callback() after the data of the request
  * is completed and before the request is completed.
  * By returning value '1', blk_end_request_callback() returns immediately
@@ -1108,20 +1083,11 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
         /*
          * check which way to transfer data
          */
-        if ((blk_fs_request(rq) || blk_pc_request(rq)) && write) {
-                /*
-                 * write to drive
-                 */
-                if (cdrom_write_check_ireason(drive, len, ireason))
-                        return ide_stopped;
-        } else if (blk_fs_request(rq) || blk_pc_request(rq)) {
-                /*
-                 * read from drive
-                 */
-                if (cdrom_read_check_ireason(drive, len, ireason))
+        if (blk_fs_request(rq) || blk_pc_request(rq)) {
+                if (ide_cd_check_ireason(drive, len, ireason, write))
                         return ide_stopped;
 
-                if (blk_fs_request(rq)) {
+                if (blk_fs_request(rq) && write == 0) {
                         int nskip;
 
                         if (ide_cd_check_transfer_size(drive, len)) {