This is a note to let you know that I've just added the patch titled
devm_memremap: Fix error value when memremap failed
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:
devm_memremap-fix-error-value-when-memremap-failed.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@xxxxxxxxxxxxxxx> know about it.
>From 93f834df9c2d4e362dfdc4b05daa0a4e18814836 Mon Sep 17 00:00:00 2001
From: Toshi Kani <toshi.kani@xxxxxxx>
Date: Sat, 20 Feb 2016 14:32:24 -0800
Subject: devm_memremap: Fix error value when memremap failed
From: Toshi Kani <toshi.kani@xxxxxxx>
commit 93f834df9c2d4e362dfdc4b05daa0a4e18814836 upstream.
devm_memremap() returns an ERR_PTR() value in case of error.
However, it returns NULL when memremap() failed. This causes
the caller, such as the pmem driver, to proceed and oops later.
Change devm_memremap() to return ERR_PTR(-ENXIO) when memremap()
failed.
Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/memremap.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -133,8 +133,10 @@ void *devm_memremap(struct device *dev,
if (addr) {
*ptr = addr;
devres_add(dev, ptr);
- } else
+ } else {
devres_free(ptr);
+ return ERR_PTR(-ENXIO);
+ }
return addr;
}
Patches currently in stable-queue which might be from toshi.kani@xxxxxxx are
queue-4.4/devm_memremap-fix-error-value-when-memremap-failed.patch
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