diff options
| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-03-31 20:15:26 +0200 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-03-31 20:15:26 +0200 |
| commit | d93bc4521c80e9d87767779814e88f6d725453d7 (patch) | |
| tree | 6c373208132f687e4ffb31db6c60e2a8638f6080 /drivers/ide/ide-tape.c | |
| parent | 9f5af4d667a6d4ebd66019b4b26b445ddbae6d6c (diff) | |
ide-{floppy,tape}: fix padding for PIO transfers
* Return number of bytes left to transfer from idetape_{in,out}put_buffers()
and number of bytes done from ide_tape_io_buffers().
* Fix padding for PIO transfers in ide_pc_intr() so read/write buffers are
always completely processed and then the transfer is padded if necessary.
* Remove invalid error messages.
* Remove now superfluous padding from ide{_io_buffers,tape_input_buffers}().
While at it:
* Set pc->bh to NULL in idetape_input_buffers() after all bh-s are done.
* Cache !!(pc->flags & PC_FLAG_WRITING) in local variable in ide_pc_intr().
Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/ide-tape.c')
| -rw-r--r-- | drivers/ide/ide-tape.c | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c index cafc67d9e2e8..cb942a9b580f 100644 --- a/drivers/ide/ide-tape.c +++ b/drivers/ide/ide-tape.c @@ -297,19 +297,15 @@ static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) return tape; } -static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, +static int idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, unsigned int bcount) { struct idetape_bh *bh = pc->bh; int count; while (bcount) { - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in " - "idetape_input_buffers\n"); - ide_pad_transfer(drive, 0, bcount); - return; - } + if (bh == NULL) + break; count = min( (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); @@ -323,21 +319,21 @@ static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, atomic_set(&bh->b_count, 0); } } + pc->bh = bh; + + return bcount; } -static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, +static int idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, unsigned int bcount) { struct idetape_bh *bh = pc->bh; int count; while (bcount) { - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in %s\n", - __func__); - return; - } + if (bh == NULL) + break; count = min((unsigned int)pc->b_count, (unsigned int)bcount); drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); bcount -= count; @@ -352,6 +348,8 @@ static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, } } } + + return bcount; } static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) @@ -563,12 +561,14 @@ static void ide_tape_handle_dsc(ide_drive_t *drive) static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, unsigned int bcount, int write) { + unsigned int bleft; + if (write) - idetape_output_buffers(drive, pc, bcount); + bleft = idetape_output_buffers(drive, pc, bcount); else - idetape_input_buffers(drive, pc, bcount); + bleft = idetape_input_buffers(drive, pc, bcount); - return bcount; + return bcount - bleft; } /* |