mirror of https://gitee.com/openkylin/linux.git
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: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
parent
64814f2399
commit
94f5a86dc3
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@ -738,125 +738,6 @@ static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
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return 1;
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}
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/*
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* Interrupt routine. Called when a read request has completed.
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*/
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static ide_startstop_t cdrom_read_intr (ide_drive_t *drive)
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{
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int stat;
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int ireason, len, sectors_to_transfer, nskip;
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struct cdrom_info *info = drive->driver_data;
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u8 lowcyl = 0, highcyl = 0;
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int dma = info->dma, dma_error = 0;
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struct request *rq = HWGROUP(drive)->rq;
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/*
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* handle dma case
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*/
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if (dma) {
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info->dma = 0;
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dma_error = HWIF(drive)->ide_dma_end(drive);
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if (dma_error) {
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printk(KERN_ERR "%s: DMA read error\n", drive->name);
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ide_dma_off(drive);
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}
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}
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if (cdrom_decode_status(drive, 0, &stat))
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return ide_stopped;
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if (dma) {
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if (!dma_error) {
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ide_end_request(drive, 1, rq->nr_sectors);
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return ide_stopped;
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} else
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return ide_error(drive, "dma error", stat);
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}
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/* Read the interrupt reason and the transfer length. */
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ireason = HWIF(drive)->INB(IDE_IREASON_REG) & 0x3;
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lowcyl = HWIF(drive)->INB(IDE_BCOUNTL_REG);
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highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);
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len = lowcyl + (256 * highcyl);
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/* If DRQ is clear, the command has completed. */
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if ((stat & DRQ_STAT) == 0) {
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/* If we're not done filling the current buffer, complain.
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Otherwise, complete the command normally. */
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if (rq->current_nr_sectors > 0) {
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printk (KERN_ERR "%s: cdrom_read_intr: data underrun (%d blocks)\n",
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drive->name, rq->current_nr_sectors);
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rq->cmd_flags |= REQ_FAILED;
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cdrom_end_request(drive, 0);
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} else
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cdrom_end_request(drive, 1);
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return ide_stopped;
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}
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/* Check that the drive is expecting to do the same thing we are. */
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if (cdrom_read_check_ireason (drive, len, ireason))
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return ide_stopped;
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if (ide_cd_check_transfer_size(drive, len)) {
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cdrom_end_request(drive, 0);
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return ide_stopped;
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}
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/* The number of sectors we need to read from the drive. */
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sectors_to_transfer = len / SECTOR_SIZE;
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/* First, figure out if we need to bit-bucket
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any of the leading sectors. */
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nskip = min_t(int, rq->current_nr_sectors - bio_cur_sectors(rq->bio), sectors_to_transfer);
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if (nskip > 0) {
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ide_cd_drain_data(drive, nskip);
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rq->current_nr_sectors -= nskip;
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sectors_to_transfer -= nskip;
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}
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/* Now loop while we still have data to read from the drive. */
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while (sectors_to_transfer > 0) {
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int this_transfer;
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/* If we've filled the present buffer but there's another
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chained buffer after it, move on. */
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if (rq->current_nr_sectors == 0 && rq->nr_sectors)
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cdrom_end_request(drive, 1);
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/* If the buffers are full, cache the rest of the data in our
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internal buffer. */
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if (rq->current_nr_sectors == 0) {
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cdrom_buffer_sectors(drive, rq->sector, sectors_to_transfer);
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sectors_to_transfer = 0;
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} else {
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/* Transfer data to the buffers.
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Figure out how many sectors we can transfer
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to the current buffer. */
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this_transfer = min_t(int, sectors_to_transfer,
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rq->current_nr_sectors);
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/* Read this_transfer sectors
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into the current buffer. */
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while (this_transfer > 0) {
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HWIF(drive)->atapi_input_bytes(drive, rq->buffer, SECTOR_SIZE);
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rq->buffer += SECTOR_SIZE;
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--rq->nr_sectors;
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--rq->current_nr_sectors;
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++rq->sector;
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--this_transfer;
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--sectors_to_transfer;
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}
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}
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}
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/* Done moving data! Wait for another interrupt. */
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ide_set_handler(drive, &cdrom_read_intr, ATAPI_WAIT_PC, NULL);
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return ide_started;
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}
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/*
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* Try to satisfy some of the current read request from our cached data.
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* Returns nonzero if the request has been completed, zero otherwise.
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@ -916,6 +797,8 @@ static int cdrom_read_from_buffer (ide_drive_t *drive)
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return 0;
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}
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static ide_startstop_t cdrom_rw_intr(ide_drive_t *);
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/*
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* Routine to send a read packet command to the drive.
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* This is usually called directly from cdrom_start_read.
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@ -954,7 +837,7 @@ static ide_startstop_t cdrom_start_read_continuation (ide_drive_t *drive)
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rq->timeout = ATAPI_WAIT_PC;
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/* Send the command to the drive and return. */
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return cdrom_transfer_packet_command(drive, rq, &cdrom_read_intr);
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return cdrom_transfer_packet_command(drive, rq, cdrom_rw_intr);
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}
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@ -1168,7 +1051,7 @@ static int cdrom_newpc_intr_dummy_cb(struct request *rq)
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/*
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* best way to deal with dma that is not sector aligned right now... note
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* that in this path we are not using ->data or ->buffer at all. this irs
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* can replace cdrom_read_intr() and cdrom_write_intr() in the future.
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* can replace cdrom_rw_intr() in the future.
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*/
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static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
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{
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@ -1343,21 +1226,22 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
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return ide_stopped;
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}
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static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
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static ide_startstop_t cdrom_rw_intr(ide_drive_t *drive)
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{
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int stat, ireason, len, sectors_to_transfer, uptodate;
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struct cdrom_info *info = drive->driver_data;
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int dma_error = 0, dma = info->dma;
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u8 lowcyl = 0, highcyl = 0;
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struct request *rq = HWGROUP(drive)->rq;
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xfer_func_t *xferfunc;
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int stat, ireason, len, sectors_to_transfer, uptodate, nskip;
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int dma_error = 0, dma = info->dma, write = rq_data_dir(rq) == WRITE;
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u8 lowcyl = 0, highcyl = 0;
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/* Check for errors. */
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if (dma) {
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info->dma = 0;
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dma_error = HWIF(drive)->ide_dma_end(drive);
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if (dma_error) {
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printk(KERN_ERR "%s: DMA write error\n", drive->name);
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printk(KERN_ERR "%s: DMA %s error\n", drive->name,
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write ? "write" : "read");
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ide_dma_off(drive);
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}
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}
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@ -1385,7 +1269,8 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
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/* If DRQ is clear, the command has completed. */
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if ((stat & DRQ_STAT) == 0) {
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/* If we're not done writing, complain.
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/*
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* If we're not done reading/writing, complain.
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* Otherwise, complete the command normally.
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*/
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uptodate = 1;
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@ -1393,27 +1278,73 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
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printk(KERN_ERR "%s: %s: data underrun (%d blocks)\n",
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drive->name, __FUNCTION__,
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rq->current_nr_sectors);
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if (!write)
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rq->cmd_flags |= REQ_FAILED;
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uptodate = 0;
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}
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cdrom_end_request(drive, uptodate);
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return ide_stopped;
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}
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/* Check that the drive is expecting to do the same thing we are. */
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if (cdrom_write_check_ireason(drive, len, ireason))
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return ide_stopped;
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sectors_to_transfer = len / SECTOR_SIZE;
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/* Check that the drive is expecting to do the same thing we are. */
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if (write) {
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if (cdrom_write_check_ireason(drive, len, ireason))
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return ide_stopped;
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xferfunc = HWIF(drive)->atapi_output_bytes;
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} else {
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if (cdrom_read_check_ireason(drive, len, ireason))
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return ide_stopped;
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if (ide_cd_check_transfer_size(drive, len)) {
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cdrom_end_request(drive, 0);
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return ide_stopped;
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}
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/*
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* First, figure out if we need to bit-bucket
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* any of the leading sectors.
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*/
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nskip = min_t(int, rq->current_nr_sectors
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- bio_cur_sectors(rq->bio),
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sectors_to_transfer);
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if (nskip > 0) {
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ide_cd_drain_data(drive, nskip);
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rq->current_nr_sectors -= nskip;
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sectors_to_transfer -= nskip;
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}
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xferfunc = HWIF(drive)->atapi_input_bytes;
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}
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/*
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* now loop and write out the data
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* now loop and read/write the data
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*/
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while (sectors_to_transfer > 0) {
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int this_transfer;
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/*
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* If we've filled the present buffer but there's another
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* chained buffer after it, move on.
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*/
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if (!write && rq->current_nr_sectors == 0 && rq->nr_sectors)
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cdrom_end_request(drive, 1);
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if (!rq->current_nr_sectors) {
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printk(KERN_ERR "%s: %s: confused, missing data\n",
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drive->name, __FUNCTION__);
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if (!write)
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/*
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* If the buffers are full, cache the rest
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* of the data in our internal buffer.
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*/
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cdrom_buffer_sectors(drive, rq->sector,
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sectors_to_transfer);
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else
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printk(KERN_ERR "%s: %s: confused, missing "
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"data\n",
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drive->name, __FUNCTION__);
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break;
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}
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@ -1423,7 +1354,7 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
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this_transfer = min_t(int, sectors_to_transfer, rq->current_nr_sectors);
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while (this_transfer > 0) {
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HWIF(drive)->atapi_output_bytes(drive, rq->buffer, SECTOR_SIZE);
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xferfunc(drive, rq->buffer, SECTOR_SIZE);
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rq->buffer += SECTOR_SIZE;
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--rq->nr_sectors;
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--rq->current_nr_sectors;
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@ -1435,12 +1366,12 @@ static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
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/*
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* current buffer complete, move on
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*/
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if (rq->current_nr_sectors == 0 && rq->nr_sectors)
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if (write && rq->current_nr_sectors == 0 && rq->nr_sectors)
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cdrom_end_request(drive, 1);
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}
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/* re-arm handler */
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ide_set_handler(drive, &cdrom_write_intr, ATAPI_WAIT_PC, NULL);
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ide_set_handler(drive, cdrom_rw_intr, ATAPI_WAIT_PC, NULL);
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return ide_started;
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}
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@ -1453,7 +1384,7 @@ static ide_startstop_t cdrom_start_write_cont(ide_drive_t *drive)
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#endif
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rq->timeout = ATAPI_WAIT_PC;
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return cdrom_transfer_packet_command(drive, rq, cdrom_write_intr);
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return cdrom_transfer_packet_command(drive, rq, cdrom_rw_intr);
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}
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static ide_startstop_t cdrom_start_write(ide_drive_t *drive, struct request *rq)
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