diff mbox

[#upstream-fixes] libata,pata_via: revert ata_wait_idle() removal from ata_sff/via_tf_load()

Message ID 4C88F99B.9070408@novell.com
State Not Applicable
Delegated to: David Miller
Headers show

Commit Message

Tejun Heo Sept. 9, 2010, 3:13 p.m. UTC 
Commit 978c0666 (libata: Remove excess delay in the tf_load path)
removed ata_wait_idle() from ata_sff_tf_load() and via_tf_load().
This caused obscure detection problems in sata_sil.

  https://bugzilla.kernel.org/show_bug.cgi?id=16606

The commit was pure performance optimization.  Revert it for now.

Reported-by: Dieter Plaetinck <dieter@plaetinck.be>
Reported-by: Jan Beulich <JBeulich@novell.com>
Bisected-by: gianluca <gianluca@sottospazio.it>
Cc: stable@kernel.org
---
Let's revert it until better solution is found.  Thanks.

 drivers/ata/libata-sff.c |    3 +++
 drivers/ata/pata_via.c   |    2 ++
 2 files changed, 5 insertions(+)

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diff mbox

Patch

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 030b1c4..f0531b0 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -418,6 +418,7 @@  void ata_sff_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 		if (ioaddr->ctl_addr)
 			iowrite8(tf->ctl, ioaddr->ctl_addr);
 		ap->last_ctl = tf->ctl;
+		ata_wait_idle(ap);
 	}

 	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
@@ -453,6 +454,8 @@  void ata_sff_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 		iowrite8(tf->device, ioaddr->device_addr);
 		VPRINTK("device 0x%X\n", tf->device);
 	}
+
+	ata_wait_idle(ap);
 }
 EXPORT_SYMBOL_GPL(ata_sff_tf_load);

diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index 5e65988..ac8d7d9 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -417,6 +417,8 @@  static void via_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 			tf->lbam,
 			tf->lbah);
 	}
+
+	ata_wait_idle(ap);
 }

 static int via_port_start(struct ata_port *ap)