Attachment 179156 Details for Bug 229260

[patch] libata_scsi-Fix-ATAPI-transfer-lengths.patch

0001-libata_scsi-Fix-ATAPI-transfer-lengths.patch (text/plain), 2.50 KB, created by Tejun Heo on 2007-10-18 05:51:36 UTC

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Creator: Tejun Heo

Created: 2007-10-18 05:51:36 UTC

Size: 2.50 KB

patch

obsolete

>From 2db78dd302d26d242d3e8e5c4c5024b6c3ea93c2 Mon Sep 17 00:00:00 2001
>From: Alan Cox <alan@lxorguk.ukuu.org.uk>
>Date: Tue, 2 Oct 2007 13:53:04 -0700
>Subject: [PATCH] libata_scsi: Fix ATAPI transfer lengths
>
>Some controller variants snoop the ATAPI length value for Packet
>transfers to do state machine and FIFO management. Thus we want to
>set it properly, even for cases where it is otherwise meaningless.
>
>Signed-off-by: Alan Cox <alan@redhat.com>
>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
>Signed-off-by: Jeff Garzik <jeff@garzik.org>
>---
> drivers/ata/libata-scsi.c |   18 ++++++++++++++----
> 1 files changed, 14 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
>index df2e057..ea53e6a 100644
>--- a/drivers/ata/libata-scsi.c
>+++ b/drivers/ata/libata-scsi.c
>@@ -2305,8 +2305,8 @@ static void atapi_request_sense(struct ata_queued_cmd *qc)
> 		qc->tf.feature |= ATAPI_PKT_DMA;
> 	} else {
> 		qc->tf.protocol = ATA_PROT_ATAPI;
>-		qc->tf.lbam = (8 * 1024) & 0xff;
>-		qc->tf.lbah = (8 * 1024) >> 8;
>+		qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
>+		qc->tf.lbah = 0;
> 	}
> 	qc->nbytes = SCSI_SENSE_BUFFERSIZE;
> 
>@@ -2415,6 +2415,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
> 	struct ata_device *dev = qc->dev;
> 	int using_pio = (dev->flags & ATA_DFLAG_PIO);
> 	int nodata = (scmd->sc_data_direction == DMA_NONE);
>+	unsigned int nbytes;
> 
> 	memset(qc->cdb, 0, dev->cdb_len);
> 	memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
>@@ -2434,14 +2435,20 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
> 	if (!using_pio && ata_check_atapi_dma(qc))
> 		using_pio = 1;
> 
>+	/* Some controller variants snoop this value for Packet transfers
>+	   to do state machine and FIFO management. Thus we want to set it
>+	   properly, and for DMA where it is effectively meaningless */
>+	nbytes = min(qc->nbytes, (unsigned int)63 * 1024);
>+
>+	qc->tf.lbam = (nbytes & 0xFF);
>+	qc->tf.lbah = (nbytes >> 8);
>+
> 	if (using_pio || nodata) {
> 		/* no data, or PIO data xfer */
> 		if (nodata)
> 			qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
> 		else
> 			qc->tf.protocol = ATA_PROT_ATAPI;
>-		qc->tf.lbam = (8 * 1024) & 0xff;
>-		qc->tf.lbah = (8 * 1024) >> 8;
> 	} else {
> 		/* DMA data xfer */
> 		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
>@@ -2452,6 +2459,9 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
> 			qc->tf.feature |= ATAPI_DMADIR;
> 	}
> 
>+
>+	/* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
>+	   as ATAPI tape drives don't get this right otherwise */
> 	return 0;
> }
> 
>-- 
>1.5.2.4
>

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