[4.2.y-ckt stable] Patch "iio:adc:ti_am335x_adc Fix buffered mode by identifying as software buffer." has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    iio:adc:ti_am335x_adc Fix buffered mode by identifying as software buffer.

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt5.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From f953e89b3d835f465f9fb6e4bec94774c9f8ed9a Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <jic23 at kernel.org>
Date: Fri, 1 Jan 2016 18:05:34 +0000
Subject: iio:adc:ti_am335x_adc Fix buffered mode by identifying as software
 buffer.

commit 9d0be85d4e2cfa2519ae16efe7ff4a7150c43c0b upstream.

Whilst this part has a hardware buffer, the identifcation that IIO cares
about is the userspace facing end.  It this case we push individual elements
from the hardware fifo into the software interface (specifically a kfifo)
rather than providing direct reads through to a hardware buffer
(as we still do in the sca3000 for example).

Technically the original specification as a hardware buffer could be
considered wrong, but it didn't matter until the patch listed below.

Result is that any attempt to enable the buffer will return -EINVAL

Fixes: 225d59adf1c8 ("iio: Specify supported modes for buffers")
Signed-off-by: Jonathan Cameron <jic23 at kernel.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/iio/adc/ti_am335x_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 942320e..c1e0553 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -289,7 +289,7 @@ static int tiadc_iio_buffered_hardware_setup(struct iio_dev *indio_dev,
 		goto error_kfifo_free;

 	indio_dev->setup_ops = setup_ops;
-	indio_dev->modes |= INDIO_BUFFER_HARDWARE;
+	indio_dev->modes |= INDIO_BUFFER_SOFTWARE;

 	return 0;

--
2.7.0