This is a note to let you know that I've just added the patch titled
gpio: mcp23s08: Bug fix of SPI device tree registration.
to the 3.14-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:
gpio-mcp23s08-bug-fix-of-spi-device-tree-registration.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 99e4b98dbe3ad1fe38a74d12c3b8d44a55930de4 Mon Sep 17 00:00:00 2001
From: Michael Welling <mwelling@xxxxxxxx>
Date: Wed, 16 Apr 2014 20:00:24 -0500
Subject: gpio: mcp23s08: Bug fix of SPI device tree registration.
From: Michael Welling <mwelling@xxxxxxxx>
commit 99e4b98dbe3ad1fe38a74d12c3b8d44a55930de4 upstream.
The chips variable needs to be incremented for each chip that is
found in the spi_present_mask when registering via device tree.
Without this and the checking a negative index is passed to the
data->chip array in a subsequent loop.
Signed-off-by: Michael Welling <mwelling@xxxxxxxx>
Acked-by: Peter Korsgaard <peter@xxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/gpio-mcp23s08.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -895,8 +895,11 @@ static int mcp23s08_probe(struct spi_dev
return -ENODEV;
}
- for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++)
+ for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
pullups[addr] = 0;
+ if (spi_present_mask & (1 << addr))
+ chips++;
+ }
} else {
type = spi_get_device_id(spi)->driver_data;
pdata = dev_get_platdata(&spi->dev);
@@ -919,12 +922,12 @@ static int mcp23s08_probe(struct spi_dev
pullups[addr] = pdata->chip[addr].pullups;
}
- if (!chips)
- return -ENODEV;
-
base = pdata->base;
}
+ if (!chips)
+ return -ENODEV;
+
data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
GFP_KERNEL);
if (!data)
Patches currently in stable-queue which might be from mwelling@xxxxxxxx are
queue-3.14/gpio-mcp23s08-bug-fix-of-spi-device-tree-registration.patch
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