ide: make ide_transfer_pc() static

* Move ->ticks field from struct ide_floppy_obj to ide_drive_t.

* Move idefloppy_transfer_pc() to ide-atapi.c and make
  ide_transfer_pc() use it.

* Always use ide_transfer_pc as a handler in ide_issue_pc().

* Remove no longer used idefloppy_start_pc_transfer(),
  ide*_transfer_pc() and 'handler' argument from ide_issue_pc().

* Make ide_transfer_pc() static.

While at it:

* idefloppy_transfer_pc() -> ide_delayed_transfer_pc()

* IDEFLOPPY_TICKS_DELAY -> IDEFLOPPY_PC_DELAY

* ->ticks -> ->pc_delay

There should be no functional changes caused by this patch.

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

5 files changed, 45 insertions, 86 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index b558663418d8..2521677e1f48 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -468,12 +468,22 @@ static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
         return ireason;
 }
 
-ide_startstop_t ide_transfer_pc(ide_drive_t *drive, unsigned int timeout,
-                                ide_expiry_t *expiry)
+static int ide_delayed_transfer_pc(ide_drive_t *drive)
+{
+        /* Send the actual packet */
+        drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
+
+        /* Timeout for the packet command */
+        return WAIT_FLOPPY_CMD;
+}
+
+static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 {
         struct ide_atapi_pc *pc = drive->pc;
         ide_hwif_t *hwif = drive->hwif;
         struct request *rq = hwif->hwgroup->rq;
+        ide_expiry_t *expiry;
+        unsigned int timeout;
         ide_startstop_t startstop;
         u8 ireason;
 
@@ -493,6 +503,25 @@ ide_startstop_t ide_transfer_pc(ide_drive_t *drive, unsigned int timeout,
                 return ide_do_reset(drive);
         }
 
+        /*
+         * If necessary schedule the packet transfer to occur 'timeout'
+         * miliseconds later in ide_delayed_transfer_pc() after the device
+         * says it's ready for a packet.
+         */
+        if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
+                timeout = drive->pc_delay;
+                expiry = &ide_delayed_transfer_pc;
+        } else {
+                if (drive->scsi) {
+                        timeout = ide_scsi_get_timeout(pc);
+                        expiry = ide_scsi_expiry;
+                } else {
+                        timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
+                                                               : WAIT_TAPE_CMD;
+                        expiry = NULL;
+                }
+        }
+
         /* Set the interrupt routine */
         ide_set_handler(drive, ide_pc_intr, timeout, expiry);
 
@@ -508,10 +537,8 @@ ide_startstop_t ide_transfer_pc(ide_drive_t *drive, unsigned int timeout,
 
         return ide_started;
 }
-EXPORT_SYMBOL_GPL(ide_transfer_pc);
 
-ide_startstop_t ide_issue_pc(ide_drive_t *drive,
-                             ide_handler_t *handler, unsigned int timeout,
+ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout,
                              ide_expiry_t *expiry)
 {
         struct ide_atapi_pc *pc = drive->pc;
@@ -550,12 +577,12 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive,
 
         /* Issue the packet command */
         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
-                ide_execute_command(drive, ATA_CMD_PACKET, handler,
+                ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
                                     timeout, NULL);
                 return ide_started;
         } else {
                 ide_execute_pkt_cmd(drive);
-                return (*handler)(drive);
+                return ide_transfer_pc(drive);
         }
 }
 EXPORT_SYMBOL_GPL(ide_issue_pc);
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 7be3cd5daa9d..2a34f1ad2284 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -73,7 +73,11 @@
 #define CAPACITY_CURRENT        0x02
 #define CAPACITY_NO_CARTRIDGE   0x03
 
-#define IDEFLOPPY_TICKS_DELAY   HZ/20   /* default delay for ZIP 100 (50ms) */
+/*
+ * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
+ * was apparently being deasserted before the unit was ready to receive data.
+ */
+#define IDEFLOPPY_PC_DELAY      (HZ/20) /* default delay for ZIP 100 (50ms) */
 
 /* Error code returned in rq->errors to the higher part of the driver. */
 #define IDEFLOPPY_ERROR_GENERAL         101
@@ -193,51 +197,6 @@ static void ide_floppy_callback(ide_drive_t *drive, int dsc)
         idefloppy_end_request(drive, uptodate, 0);
 }
 
-/*
- * What we have here is a classic case of a top half / bottom half interrupt
- * service routine. In interrupt mode, the device sends an interrupt to signal
- * that it is ready to receive a packet. However, we need to delay about 2-3
- * ticks before issuing the packet or we gets in trouble.
- */
-static int idefloppy_transfer_pc(ide_drive_t *drive)
-{
-        /* Send the actual packet */
-        drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
-
-        /* Timeout for the packet command */
-        return WAIT_FLOPPY_CMD;
-}
-
-/*
- * Called as an interrupt (or directly). When the device says it's ready for a
- * packet, we schedule the packet transfer to occur about 2-3 ticks later in
- * transfer_pc.
- */
-static ide_startstop_t idefloppy_start_pc_transfer(ide_drive_t *drive)
-{
-        idefloppy_floppy_t *floppy = drive->driver_data;
-        ide_expiry_t *expiry;
-        unsigned int timeout;
-
-        /*
-         * The following delay solves a problem with ATAPI Zip 100 drives
-         * where the Busy flag was apparently being deasserted before the
-         * unit was ready to receive data. This was happening on a
-         * 1200 MHz Athlon system. 10/26/01 25msec is too short,
-         * 40 and 50msec work well. ide_pc_intr will not be actually
-         * used until after the packet is moved in about 50 msec.
-         */
-        if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
-                timeout = floppy->ticks;
-                expiry = &idefloppy_transfer_pc;
-        } else {
-                timeout = WAIT_FLOPPY_CMD;
-                expiry = NULL;
-        }
-
-        return ide_transfer_pc(drive, timeout, expiry);
-}
-
 static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
                                     struct ide_atapi_pc *pc)
 {
@@ -281,8 +240,7 @@ static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
 
         pc->retries++;
 
-        return ide_issue_pc(drive, idefloppy_start_pc_transfer,
-                            WAIT_FLOPPY_CMD, NULL);
+        return ide_issue_pc(drive, WAIT_FLOPPY_CMD, NULL);
 }
 
 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
@@ -597,21 +555,7 @@ static sector_t idefloppy_capacity(ide_drive_t *drive)
 ide_devset_rw_field(bios_cyl, bios_cyl);
 ide_devset_rw_field(bios_head, bios_head);
 ide_devset_rw_field(bios_sect, bios_sect);
-
-static int get_ticks(ide_drive_t *drive)
-{
-        idefloppy_floppy_t *floppy = drive->driver_data;
-        return floppy->ticks;
-}
-
-static int set_ticks(ide_drive_t *drive, int arg)
-{
-        idefloppy_floppy_t *floppy = drive->driver_data;
-        floppy->ticks = arg;
-        return 0;
-}
-
-IDE_DEVSET(ticks, DS_SYNC, get_ticks, set_ticks);
+ide_devset_rw_field(ticks, pc_delay);
 
 static const struct ide_proc_devset idefloppy_settings[] = {
         IDE_PROC_DEVSET(bios_cyl,  0, 1023),
@@ -647,7 +591,7 @@ static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
         if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
                 /* This value will be visible in the /proc/ide/hdx/settings */
-                floppy->ticks = IDEFLOPPY_TICKS_DELAY;
+                drive->pc_delay = IDEFLOPPY_PC_DELAY;
                 blk_queue_max_sectors(drive->queue, 64);
         }
 
diff --git a/drivers/ide/ide-floppy.h b/drivers/ide/ide-floppy.h
index ced5ceb474de..00ad5f992dc0 100644
--- a/drivers/ide/ide-floppy.h
+++ b/drivers/ide/ide-floppy.h
@@ -20,8 +20,7 @@ typedef struct ide_floppy_obj {
 
         /* Last error information */
         u8 sense_key, asc, ascq;
-        /* delay this long before sending packet command */
-        u8 ticks;
+
         int progress_indication;
 
         /* Device information */
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index a148de623af0..622d5fed2dc5 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -654,10 +654,6 @@ static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
  * again, the callback function will be called and then we will handle the next
  * request.
  */
-static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
-{
-        return ide_transfer_pc(drive, WAIT_TAPE_CMD, NULL);
-}
 
 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
                 struct ide_atapi_pc *pc)
@@ -705,7 +701,7 @@ static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
 
         pc->retries++;
 
-        return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL);
+        return ide_issue_pc(drive, WAIT_TAPE_CMD, NULL);
 }
 
 /* A mode sense command is used to "sense" tape parameters. */
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 8733fe349254..7d3d03f98914 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -270,12 +270,6 @@ static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
         return 0;
 }
 
-static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
-{
-        return ide_transfer_pc(drive, ide_scsi_get_timeout(drive->pc),
-                               ide_scsi_expiry);
-}
-
 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 {
         switch (pc->c[0]) {
@@ -321,8 +315,7 @@ static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
         /* Set the current packet command */
         drive->pc = pc;
 
-        return ide_issue_pc(drive, idescsi_transfer_pc,
-                            ide_scsi_get_timeout(pc), ide_scsi_expiry);
+        return ide_issue_pc(drive, ide_scsi_get_timeout(pc), ide_scsi_expiry);
 }
 
 /*