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Commit eec4c3f3 authored by Albert Lee's avatar Albert Lee Committed by Jeff Garzik
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[PATCH] libata: use qc->result_tf for temp taskfile storage 



Use qc->result_tf for temp taskfile storage.

Signed-off-by: default avatarAlbert Lee <albertcc@tw.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 3655d1d3

drivers/scsi/libata-core.c

+10 −4
Original line number Diff line number Diff line
@@ -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 */