| From | Greg Kroah-Hartman <> | Subject | [ 023/171] libata: set dma_mode to 0xff in reset | Date | Tue, 15 Jan 2013 14:43:08 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Aaron Lu <aaron.lu@intel.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@dunelm.org.uk> Signed-off-by: Aaron Lu <aaron.lu@intel.com> Tested-by: Szymon Janc <szymon@janc.net.pl> Tested-by: Dutra Julio <dutra.julio@gmail.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/ata/libata-core.c | 1 + drivers/ata/libata-eh.c | 1 + 2 files changed, 2 insertions(+)
--- 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 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2600,6 +2600,7 @@ int ata_eh_reset(struct ata_link *link, * 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
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