diff options
| author | Tejun Heo <tj@kernel.org> | 2010-10-15 11:00:08 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2010-10-21 21:17:00 -0400 |
| commit | 6ad601955315b010a117306b994f2204fae85fdc (patch) | |
| tree | d10eadcbb064c463a413823b9cccd018ae1a94e8 /drivers/ata/libahci.c | |
| parent | f7a437dda2b5c104a897405cbff678aa1eb37897 (diff) | |
libahci: fix result_tf handling after an ATA PIO data-in command
ATA devices don't send D2H Reg FIS after an successful ATA PIO data-in
command. The host is supposed to take the TF and E_Status of the
preceding PIO Setup FIS. Update ahci_qc_fill_rtf() such that it takes
TF + E_Status from PIO Setup FIS after a successful ATA PIO data-in
command.
Without this patch, result_tf for such a command is filled with the
content of the previous D2H Reg FIS which belongs to a previous
command, which can make the command incorrectly seen as failed.
* Patch updated to grab the whole TF + E_Status from PIO Setup FIS
instead of just E_Status as suggested by Robert Hancock.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Mark Lord <kernel@teksavvy.com>
Cc: Robert Hancock <hancockrwd@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libahci.c')
| -rw-r--r-- | drivers/ata/libahci.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 524dbe8be16..ebc08d65b3d 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -1752,12 +1752,24 @@ static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc) static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc) { struct ahci_port_priv *pp = qc->ap->private_data; - u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG; + u8 *rx_fis = pp->rx_fis; if (pp->fbs_enabled) - d2h_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ; + rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ; + + /* + * After a successful execution of an ATA PIO data-in command, + * the device doesn't send D2H Reg FIS to update the TF and + * the host should take TF and E_Status from the preceding PIO + * Setup FIS. + */ + if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE && + !(qc->flags & ATA_QCFLAG_FAILED)) { + ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf); + qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15]; + } else + ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf); - ata_tf_from_fis(d2h_fis, &qc->result_tf); return true; } |