linux-kernel - [PATCH 070/222] libata: set dma

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Date:	Wed, 16 Jan 2013 13:54:30 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Aaron Lu <aaron.lu@...el.com>, Jeff Garzik <jgarzik@...hat.com>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 070/222] libata: set dma_mode to 0xff in reset

3.5.7.3 -stable review patch.  If anyone has any objections, please let me know.

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

From: Aaron Lu <aaron.lu@...el.com>

commit 5416912af75de9cba5d1c75b99a7888b0bbbd2fb upstream.

ata_device->dma_mode's initial value is zero, which is not a valid dma
mode, but ata_dma_enabled will return true for this value. This patch
sets dma_mode to 0xff in reset function, so that ata_dma_enabled will
not return true for this case, or it will cause problem for pata_acpi.

The corrsponding bugzilla page is at:
https://bugzilla.kernel.org/show_bug.cgi?id=49151

Reported-by: Phillip Wood <phillip.wood@...elm.org.uk>
Signed-off-by: Aaron Lu <aaron.lu@...el.com>
Tested-by: Szymon Janc <szymon@...c.net.pl>
Tested-by: Dutra Julio <dutra.julio@...il.com>
Acked-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/ata/libata-core.c |    1 +
 drivers/ata/libata-eh.c   |    1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 71e8385..96f0847 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2536,6 +2536,7 @@ int ata_bus_probe(struct ata_port *ap)
 		 * bus as we may be talking too fast.
 		 */
 		dev->pio_mode = XFER_PIO_0;
+		dev->dma_mode = 0xff;
 
 		/* If the controller has a pio mode setup function
 		 * then use it to set the chipset to rights. Don't
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 6d53cf9..430a248 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2618,6 +2618,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
 		 * bus as we may be talking too fast.
 		 */
 		dev->pio_mode = XFER_PIO_0;
+		dev->dma_mode = 0xff;
 
 		/* If the controller has a pio mode setup function
 		 * then use it to set the chipset to rights. Don't
-- 
1.7.9.5

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