linux-kernel - [071/129] libata,pata_via: revert ata_wait_idle() removal from ata_sff/via_tf

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Message-Id: <20100918191303.443273257@clark.site>
Date:	Sat, 18 Sep 2010 12:12:49 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jeff Garzik <jgarzik@...hat.com>
Subject: [071/129] libata,pata_via: revert ata_wait_idle() removal from ata_sff/via_tf_load()

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Tejun Heo <teheo@...ell.com>

commit 40c6023031369ae5573e622ca54fa3ffe89fb865 upstream.

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@...etinck.be>
Reported-by: Jan Beulich <JBeulich@...ell.com>
Bisected-by: gianluca <gianluca@...tospazio.it>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- 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
 		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
 		iowrite8(tf->device, ioaddr->device_addr);
 		VPRINTK("device 0x%X\n", tf->device);
 	}
+
+	ata_wait_idle(ap);
 }
 EXPORT_SYMBOL_GPL(ata_sff_tf_load);
 
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -417,6 +417,8 @@ static void via_tf_load(struct ata_port
 			tf->lbam,
 			tf->lbah);
 	}
+
+	ata_wait_idle(ap);
 }
 
 static int via_port_start(struct ata_port *ap)


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