This is a note to let you know that I've just added the patch titled
spi/pxa2xx: initialize DMA channels to -1 to prevent inadvertent match
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-pxa2xx-initialize-dma-channels-to-1-to-prevent-inadvertent-match.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 483c319188c74e82b29a0ed7a7fa7065570f2193 Mon Sep 17 00:00:00 2001
From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Date: Mon, 13 Jan 2014 11:17:04 +0200
Subject: spi/pxa2xx: initialize DMA channels to -1 to prevent inadvertent match
From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
commit 483c319188c74e82b29a0ed7a7fa7065570f2193 upstream.
Commit cddb339badb0 (spi/pxa2xx: convert to dma_request_slave_channel_compat())
converted the driver to use ACPI provided DMA helpers but it forgot to
initialize the platform data for the channels to -1. Failing to do so will
result inadvertent match in the filter function because 0 is a valid
channel number.
Prevent this from happening by initializing both platform data channels
correctly to -1.
Fixes: cddb339badb0 (spi/pxa2xx: convert to dma_request_slave_channel_compat())
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-pxa2xx.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1070,6 +1070,8 @@ pxa2xx_spi_acpi_get_pdata(struct platfor
pdata->num_chipselect = 1;
pdata->enable_dma = true;
+ pdata->tx_chan_id = -1;
+ pdata->rx_chan_id = -1;
return pdata;
}
Patches currently in stable-queue which might be from mika.westerberg@xxxxxxxxxxxxxxx are
queue-3.12/spi-pxa2xx-initialize-dma-channels-to-1-to-prevent-inadvertent-match.patch
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