This is a note to let you know that I've just added the patch titled
iio: buffer: correctly return bytes written in output buffers
to the 6.1-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-buffer-correctly-return-bytes-written-in-output-buffers.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5184a26a28fac1d708b0bfeeb958a9260c2924c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nuno=20S=C3=A1?= <nuno.sa@xxxxxxxxxx>
Date: Thu, 16 Feb 2023 11:14:50 +0100
Subject: iio: buffer: correctly return bytes written in output buffers
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From: Nuno Sá <nuno.sa@xxxxxxxxxx>
commit b5184a26a28fac1d708b0bfeeb958a9260c2924c upstream.
If for some reason 'rb->access->write()' does not write the full
requested data and the O_NONBLOCK is set, we would return 'n' to
userspace which is not really truth. Hence, let's return the number of
bytes we effectively wrote.
Fixes: 9eeee3b0bf190 ("iio: Add output buffer support")
Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Reviewed-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230216101452.591805-2-nuno.sa@xxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/industrialio-buffer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -220,7 +220,7 @@ static ssize_t iio_buffer_write(struct f
} while (ret == 0);
remove_wait_queue(&rb->pollq, &wait);
- return ret < 0 ? ret : n;
+ return ret < 0 ? ret : written;
}
/**
Patches currently in stable-queue which might be from nuno.sa@xxxxxxxxxx are
queue-6.1/iio-buffer-correctly-return-bytes-written-in-output-buffers.patch
queue-6.1/iio-adis16480-select-config_crc32.patch
queue-6.1/iio-buffer-make-sure-o_nonblock-is-respected.patch
