ide-cd: merge cdrom_read_intr() and cdrom_write_intr()

Add handling of read requests to cdrom_write_intr(), rename it
to cdrom_rw_intr() and remove no longer needed cdrom_read_intr().

There should be no functionality changes caused by this patch.
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 64814f23
......@@ -738,125 +738,6 @@ static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
return 1;
}
/*
* Interrupt routine. Called when a read request has completed.
*/
static ide_startstop_t cdrom_read_intr (ide_drive_t *drive)
{
int stat;
int ireason, len, sectors_to_transfer, nskip;
struct cdrom_info *info = drive->driver_data;
u8 lowcyl = 0, highcyl = 0;
int dma = info->dma, dma_error = 0;
struct request *rq = HWGROUP(drive)->rq;
/*
* handle dma case
*/
if (dma) {
info->dma = 0;
dma_error = HWIF(drive)->ide_dma_end(drive);
if (dma_error) {
printk(KERN_ERR "%s: DMA read error\n", drive->name);
ide_dma_off(drive);
}
}
if (cdrom_decode_status(drive, 0, &stat))
return ide_stopped;
if (dma) {
if (!dma_error) {
ide_end_request(drive, 1, rq->nr_sectors);
return ide_stopped;
} else
return ide_error(drive, "dma error", stat);
}
/* Read the interrupt reason and the transfer length. */
ireason = HWIF(drive)->INB(IDE_IREASON_REG) & 0x3;
lowcyl = HWIF(drive)->INB(IDE_BCOUNTL_REG);
highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);
len = lowcyl + (256 * highcyl);
/* If DRQ is clear, the command has completed. */
if ((stat & DRQ_STAT) == 0) {
/* If we're not done filling the current buffer, complain.
Otherwise, complete the command normally. */
if (rq->current_nr_sectors > 0) {
printk (KERN_ERR "%s: cdrom_read_intr: data underrun (%d blocks)\n",
drive->name, rq->current_nr_sectors);
rq->cmd_flags |= REQ_FAILED;
cdrom_end_request(drive, 0);
} else
cdrom_end_request(drive, 1);
return ide_stopped;
}
/* Check that the drive is expecting to do the same thing we are. */
if (cdrom_read_check_ireason (drive, len, ireason))
return ide_stopped;
if (ide_cd_check_transfer_size(drive, len)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
/* The number of sectors we need to read from the drive. */
sectors_to_transfer = len / SECTOR_SIZE;
/* First, figure out if we need to bit-bucket
any of the leading sectors. */
nskip = min_t(int, rq->current_nr_sectors - bio_cur_sectors(rq->bio), sectors_to_transfer);
if (nskip > 0) {
ide_cd_drain_data(drive, nskip);
rq->current_nr_sectors -= nskip;
sectors_to_transfer -= nskip;
}
/* Now loop while we still have data to read from the drive. */
while (sectors_to_transfer > 0) {
int this_transfer;
/* If we've filled the present buffer but there's another
chained buffer after it, move on. */
if (rq->current_nr_sectors == 0 && rq->nr_sectors)
cdrom_end_request(drive, 1);
/* If the buffers are full, cache the rest of the data in our
internal buffer. */
if (rq->current_nr_sectors == 0) {
cdrom_buffer_sectors(drive, rq->sector, sectors_to_transfer);
sectors_to_transfer = 0;
} else {
/* Transfer data to the buffers.
Figure out how many sectors we can transfer
to the current buffer. */
this_transfer = min_t(int, sectors_to_transfer,
rq->current_nr_sectors);
/* Read this_transfer sectors
into the current buffer. */
while (this_transfer > 0) {
HWIF(drive)->atapi_input_bytes(drive, rq->buffer, SECTOR_SIZE);
rq->buffer += SECTOR_SIZE;
--rq->nr_sectors;
--rq->current_nr_sectors;
++rq->sector;
--this_transfer;
--sectors_to_transfer;
}
}
}
/* Done moving data! Wait for another interrupt. */
ide_set_handler(drive, &cdrom_read_intr, ATAPI_WAIT_PC, NULL);
return ide_started;
}
/*
* Try to satisfy some of the current read request from our cached data.
* Returns nonzero if the request has been completed, zero otherwise.
......@@ -916,6 +797,8 @@ static int cdrom_read_from_buffer (ide_drive_t *drive)
return 0;
}
static ide_startstop_t cdrom_rw_intr(ide_drive_t *);
/*
* Routine to send a read packet command to the drive.
* This is usually called directly from cdrom_start_read.
......@@ -954,7 +837,7 @@ static ide_startstop_t cdrom_start_read_continuation (ide_drive_t *drive)
rq->timeout = ATAPI_WAIT_PC;
/* Send the command to the drive and return. */
return cdrom_transfer_packet_command(drive, rq, &cdrom_read_intr);
return cdrom_transfer_packet_command(drive, rq, cdrom_rw_intr);
}
......@@ -1168,7 +1051,7 @@ static int cdrom_newpc_intr_dummy_cb(struct request *rq)
/*
* best way to deal with dma that is not sector aligned right now... note
* that in this path we are not using ->data or ->buffer at all. this irs
* can replace cdrom_read_intr() and cdrom_write_intr() in the future.
* can replace cdrom_rw_intr() in the future.
*/
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
{
......@@ -1343,21 +1226,22 @@ end_request:
return ide_stopped;
}
static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
static ide_startstop_t cdrom_rw_intr(ide_drive_t *drive)
{
int stat, ireason, len, sectors_to_transfer, uptodate;
struct cdrom_info *info = drive->driver_data;
int dma_error = 0, dma = info->dma;
u8 lowcyl = 0, highcyl = 0;
struct request *rq = HWGROUP(drive)->rq;
xfer_func_t *xferfunc;
int stat, ireason, len, sectors_to_transfer, uptodate, nskip;
int dma_error = 0, dma = info->dma, write = rq_data_dir(rq) == WRITE;
u8 lowcyl = 0, highcyl = 0;
/* Check for errors. */
if (dma) {
info->dma = 0;
dma_error = HWIF(drive)->ide_dma_end(drive);
if (dma_error) {
printk(KERN_ERR "%s: DMA write error\n", drive->name);
printk(KERN_ERR "%s: DMA %s error\n", drive->name,
write ? "write" : "read");
ide_dma_off(drive);
}
}
......@@ -1385,7 +1269,8 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
/* If DRQ is clear, the command has completed. */
if ((stat & DRQ_STAT) == 0) {
/* If we're not done writing, complain.
/*
* If we're not done reading/writing, complain.
* Otherwise, complete the command normally.
*/
uptodate = 1;
......@@ -1393,27 +1278,73 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
printk(KERN_ERR "%s: %s: data underrun (%d blocks)\n",
drive->name, __FUNCTION__,
rq->current_nr_sectors);
if (!write)
rq->cmd_flags |= REQ_FAILED;
uptodate = 0;
}
cdrom_end_request(drive, uptodate);
return ide_stopped;
}
sectors_to_transfer = len / SECTOR_SIZE;
/* Check that the drive is expecting to do the same thing we are. */
if (cdrom_write_check_ireason(drive, len, ireason))
return ide_stopped;
if (write) {
if (cdrom_write_check_ireason(drive, len, ireason))
return ide_stopped;
sectors_to_transfer = len / SECTOR_SIZE;
xferfunc = HWIF(drive)->atapi_output_bytes;
} else {
if (cdrom_read_check_ireason(drive, len, ireason))
return ide_stopped;
if (ide_cd_check_transfer_size(drive, len)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
/*
* First, figure out if we need to bit-bucket
* any of the leading sectors.
*/
nskip = min_t(int, rq->current_nr_sectors
- bio_cur_sectors(rq->bio),
sectors_to_transfer);
if (nskip > 0) {
ide_cd_drain_data(drive, nskip);
rq->current_nr_sectors -= nskip;
sectors_to_transfer -= nskip;
}
xferfunc = HWIF(drive)->atapi_input_bytes;
}
/*
* now loop and write out the data
* now loop and read/write the data
*/
while (sectors_to_transfer > 0) {
int this_transfer;
/*
* If we've filled the present buffer but there's another
* chained buffer after it, move on.
*/
if (!write && rq->current_nr_sectors == 0 && rq->nr_sectors)
cdrom_end_request(drive, 1);
if (!rq->current_nr_sectors) {
printk(KERN_ERR "%s: %s: confused, missing data\n",
drive->name, __FUNCTION__);
if (!write)
/*
* If the buffers are full, cache the rest
* of the data in our internal buffer.
*/
cdrom_buffer_sectors(drive, rq->sector,
sectors_to_transfer);
else
printk(KERN_ERR "%s: %s: confused, missing "
"data\n",
drive->name, __FUNCTION__);
break;
}
......@@ -1423,7 +1354,7 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
this_transfer = min_t(int, sectors_to_transfer, rq->current_nr_sectors);
while (this_transfer > 0) {
HWIF(drive)->atapi_output_bytes(drive, rq->buffer, SECTOR_SIZE);
xferfunc(drive, rq->buffer, SECTOR_SIZE);
rq->buffer += SECTOR_SIZE;
--rq->nr_sectors;
--rq->current_nr_sectors;
......@@ -1435,12 +1366,12 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
/*
* current buffer complete, move on
*/
if (rq->current_nr_sectors == 0 && rq->nr_sectors)
if (write && rq->current_nr_sectors == 0 && rq->nr_sectors)
cdrom_end_request(drive, 1);
}
/* re-arm handler */
ide_set_handler(drive, &cdrom_write_intr, ATAPI_WAIT_PC, NULL);
ide_set_handler(drive, cdrom_rw_intr, ATAPI_WAIT_PC, NULL);
return ide_started;
}
......@@ -1453,7 +1384,7 @@ static ide_startstop_t cdrom_start_write_cont(ide_drive_t *drive)
#endif
rq->timeout = ATAPI_WAIT_PC;
return cdrom_transfer_packet_command(drive, rq, cdrom_write_intr);
return cdrom_transfer_packet_command(drive, rq, cdrom_rw_intr);
}
static ide_startstop_t cdrom_start_write(ide_drive_t *drive, struct request *rq)
......
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