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[PATCH] libata: use qc->result_tf for temp taskfile storage

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Use qc->result_tf for temp taskfile storage.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Albert Lee 2006-05-18 17:51:10 +08:00 committed by Jeff Garzik
parent 3655d1d323
commit eec4c3f317
1 changed files with 10 additions and 4 deletions
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14
drivers/scsi/libata-core.c
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@ -3865,10 +3865,16 @@ static void atapi_pio_bytes(struct ata_queued_cmd *qc)
unsigned int ireason, bc_lo, bc_hi, bytes;
int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
ap->ops->tf_read(ap, &qc->tf);
ireason = qc->tf.nsect;
bc_lo = qc->tf.lbam;
bc_hi = qc->tf.lbah;
/* Abuse qc->result_tf for temp storage of intermediate TF
* here to save some kernel stack usage.
* For normal completion, qc->result_tf is not relevant. For
* error, qc->result_tf is later overwritten by ata_qc_complete().
* So, the correctness of qc->result_tf is not affected.
*/
ap->ops->tf_read(ap, &qc->result_tf);
ireason = qc->result_tf.nsect;
bc_lo = qc->result_tf.lbam;
bc_hi = qc->result_tf.lbah;
bytes = (bc_hi << 8) | bc_lo;
/* shall be cleared to zero, indicating xfer of data */