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ide-tape: simplify code branching in the interrupt handler 

... by adding a new typedef function pointer idetape_io_buf in order to call
the proper buffer i/o handler depending on the data direction.

Bart:
- move idetape_io_buf before idetape_pc_intr() comment

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Borislav Petkov 2008-02-06 02:57:52 +01:00 committed by Bartlomiej Zolnierkiewicz
parent 37016bab60
commit a1efc85f0b
1 changed files with 28 additions and 26 deletions
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54
drivers/ide/ide-tape.c
View File

@ -1104,19 +1104,22 @@ static void idetape_postpone_request (ide_drive_t *drive)
ide_stall_queue(drive, tape->dsc_polling_frequency);
}
typedef void idetape_io_buf(ide_drive_t *, idetape_pc_t *, unsigned int);
/*
* idetape_pc_intr is the usual interrupt handler which will be called
* during a packet command. We will transfer some of the data (as
* requested by the drive) and will re-point interrupt handler to us.
* When data transfer is finished, we will act according to the
* algorithm described before idetape_issue_packet_command.
*
* This is the usual interrupt handler which will be called during a packet
* command. We will transfer some of the data (as requested by the drive) and
* will re-point interrupt handler to us. When data transfer is finished, we
* will act according to the algorithm described before
* idetape_issue_packet_command.
*/
static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
idetape_tape_t *tape = drive->driver_data;
idetape_pc_t *pc = tape->pc;
xfer_func_t *xferfunc;
idetape_io_buf *iobuf;
unsigned int temp;
#if SIMULATE_ERRORS
static int error_sim_count = 0;
@ -1184,7 +1187,8 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
if (pc->c[0] == REQUEST_SENSE) {
printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
printk(KERN_ERR "ide-tape: I/O error in request"
" sense command\n");
return ide_do_reset(drive);
}
debug_log(DBG_ERR, "[cmd %x]: check condition\n",
@ -1223,7 +1227,7 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
ireason = hwif->INB(IDE_IREASON_REG);
if (ireason & CD) {
printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
return ide_do_reset(drive);
}
if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
@ -1239,31 +1243,29 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
temp = pc->actually_transferred + bcount;
if (temp > pc->request_transfer) {
if (temp > pc->buffer_size) {
printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
printk(KERN_ERR "ide-tape: The tape wants to "
"send us more data than expected "
"- discarding data\n");
idetape_discard_data(drive, bcount);
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
ide_set_handler(drive, &idetape_pc_intr,
IDETAPE_WAIT_CMD, NULL);
return ide_started;
}
debug_log(DBG_SENSE, "The tape wants to send us more "
"data than expected - allowing transfer\n");
}
}
if (test_bit(PC_WRITING, &pc->flags)) {
if (pc->bh != NULL)
idetape_output_buffers(drive, pc, bcount);
else
/* Write the current buffer */
hwif->atapi_output_bytes(drive, pc->current_position,
bcount);
iobuf = &idetape_input_buffers;
xferfunc = hwif->atapi_input_bytes;
} else {
if (pc->bh != NULL)
idetape_input_buffers(drive, pc, bcount);
else
/* Read the current buffer */
hwif->atapi_input_bytes(drive, pc->current_position,
bcount);
iobuf = &idetape_output_buffers;
xferfunc = hwif->atapi_output_bytes;
}
if (pc->bh)
iobuf(drive, pc, bcount);
else
xferfunc(drive, pc->current_position, bcount);
/* Update the current position */
pc->actually_transferred += bcount;
pc->current_position += bcount;