This is a note to let you know that I've just added the patch titled
iio: querying buffer scan_mask should return 0/1
to the 3.10-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:
iio-querying-buffer-scan_mask-should-return-0-1.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2076a20fc1a06f7b0333c62a2bb4eeeac7ed1bcb Mon Sep 17 00:00:00 2001
From: Alec Berg <alecaberg@xxxxxxxxxxxx>
Date: Wed, 19 Mar 2014 18:50:00 +0000
Subject: iio: querying buffer scan_mask should return 0/1
From: Alec Berg <alecaberg@xxxxxxxxxxxx>
commit 2076a20fc1a06f7b0333c62a2bb4eeeac7ed1bcb upstream.
Ensure that querying the IIO buffer scan_mask returns a value of
0 or 1. Currently querying the scan mask has the value returned
by test_bit(), which returns either true or false. For some
architectures test_bit() may return -1 for true, which will appear
to return an error when returning from iio_scan_mask_query().
Additionally, it's important for the sysfs interface to consistently
return the same thing when querying the scan_mask.
Signed-off-by: Alec Berg <alecaberg@xxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/industrialio-buffer.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -119,7 +119,8 @@ static ssize_t iio_scan_el_show(struct d
int ret;
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- ret = test_bit(to_iio_dev_attr(attr)->address,
+ /* Ensure ret is 0 or 1. */
+ ret = !!test_bit(to_iio_dev_attr(attr)->address,
indio_dev->buffer->scan_mask);
return sprintf(buf, "%d\n", ret);
@@ -762,7 +763,8 @@ int iio_scan_mask_query(struct iio_dev *
if (!buffer->scan_mask)
return 0;
- return test_bit(bit, buffer->scan_mask);
+ /* Ensure return value is 0 or 1. */
+ return !!test_bit(bit, buffer->scan_mask);
};
EXPORT_SYMBOL_GPL(iio_scan_mask_query);
Patches currently in stable-queue which might be from alecaberg@xxxxxxxxxxxx are
queue-3.10/iio-querying-buffer-scan_mask-should-return-0-1.patch
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