This is a note to let you know that I've just added the patch titled
drivercore: Fix unregistration path of platform devices
to the 4.2-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:
drivercore-fix-unregistration-path-of-platform-devices.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7f5dcaf1fdf289767a126a0a5cc3ef39b5254b06 Mon Sep 17 00:00:00 2001
From: Grant Likely <grant.likely@xxxxxxxxxx>
Date: Sun, 7 Jun 2015 15:20:11 +0100
Subject: drivercore: Fix unregistration path of platform devices
From: Grant Likely <grant.likely@xxxxxxxxxx>
commit 7f5dcaf1fdf289767a126a0a5cc3ef39b5254b06 upstream.
The unregister path of platform_device is broken. On registration, it
will register all resources with either a parent already set, or
type==IORESOURCE_{IO,MEM}. However, on unregister it will release
everything with type==IORESOURCE_{IO,MEM}, but ignore the others. There
are also cases where resources don't get registered in the first place,
like with devices created by of_platform_populate()*.
Fix the unregister path to be symmetrical with the register path by
checking the parent pointer instead of the type field to decide which
resources to unregister. This is safe because the upshot of the
registration path algorithm is that registered resources have a parent
pointer, and non-registered resources do not.
* It can be argued that of_platform_populate() should be registering
it's resources, and they argument has some merit. However, there are
quite a few platforms that end up broken if we try to do that due to
overlapping resources in the device tree. Until that is fixed, we need
to solve the immediate problem.
Cc: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
Cc: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxx>
Tested-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
Tested-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/platform.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -375,9 +375,7 @@ int platform_device_add(struct platform_
while (--i >= 0) {
struct resource *r = &pdev->resource[i];
- unsigned long type = resource_type(r);
-
- if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
+ if (r->parent)
release_resource(r);
}
@@ -408,9 +406,7 @@ void platform_device_del(struct platform
for (i = 0; i < pdev->num_resources; i++) {
struct resource *r = &pdev->resource[i];
- unsigned long type = resource_type(r);
-
- if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
+ if (r->parent)
release_resource(r);
}
}
Patches currently in stable-queue which might be from grant.likely@xxxxxxxxxx are
queue-4.2/drivercore-fix-unregistration-path-of-platform-devices.patch
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