Patch "uio: fix dmem_region_start computation" has been added to the 4.4-stable tree

Patch "uio: fix dmem_region_start computation" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    uio: fix dmem_region_start computation

to the 4.4-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:
     uio-fix-dmem_region_start-computation.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4d31a2588ae37a5d0f61f4d956454e9504846aeb Mon Sep 17 00:00:00 2001
From: Jan Viktorin <viktorin@rehivetech.com>
Date: Tue, 17 May 2016 11:22:17 +0200
Subject: uio: fix dmem_region_start computation

From: Jan Viktorin <viktorin@rehivetech.com>

commit 4d31a2588ae37a5d0f61f4d956454e9504846aeb upstream.

The variable i contains a total number of resources (including
IORESOURCE_IRQ). However, we want the dmem_region_start to point
after the last resource of type IORESOURCE_MEM. The original behaviour
leads (very likely) to skipping several UIO mapping regions and makes
them useless. Fix this by computing dmem_region_start from the uiomem
which points to the last used UIO mapping.

Fixes: 0a0c3b5a24bd ("Add new uio device for dynamic memory allocation")

Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/uio/uio_dmem_genirq.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/uio/uio_dmem_genirq.c
+++ b/drivers/uio/uio_dmem_genirq.c
@@ -229,7 +229,7 @@ static int uio_dmem_genirq_probe(struct
 		++uiomem;
 	}
 
-	priv->dmem_region_start = i;
+	priv->dmem_region_start = uiomem - &uioinfo->mem[0];
 	priv->num_dmem_regions = pdata->num_dynamic_regions;
 
 	for (i = 0; i < pdata->num_dynamic_regions; ++i) {


Patches currently in stable-queue which might be from viktorin@rehivetech.com are

queue-4.4/uio-fix-dmem_region_start-computation.patch