Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.13 34/46] fs/proc/proc_devtree.c: remove empty /proc/device-tree when no openfirmware exists. | Date | Fri, 28 Mar 2014 10:32:18 -0700 |
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3.13-stable review patch. If anyone has any objections, please let me know.
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From: Dave Jones <davej@redhat.com>
commit c1d867a54d426b45da017fbe8e585f8a3064ce8d upstream.
Distribution kernels might want to build in support for /proc/device-tree for kernels that might end up running on hardware that doesn't support openfirmware. This results in an empty /proc/device-tree existing. Remove it if the OFW root node doesn't exist.
This situation actually confuses grub2, resulting in install failures. grub2 sees the /proc/device-tree and picks the wrong install target cf. http://bzr.savannah.gnu.org/lh/grub/trunk/grub/annotate/4300/util/grub-install.in#L311 grub should be more robust, but still, leaving an empty proc dir seems pointless.
Addresses https://bugzilla.redhat.com/show_bug.cgi?id=818378.
Signed-off-by: Dave Jones <davej@redhat.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Paul Mackerras <paulus@samba.org> Cc: Josh Boyer <jwboyer@fedoraproject.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/proc/proc_devtree.c | 1 + 1 file changed, 1 insertion(+)
--- a/fs/proc/proc_devtree.c +++ b/fs/proc/proc_devtree.c @@ -232,6 +232,7 @@ void __init proc_device_tree_init(void) return; root = of_find_node_by_path("/"); if (root == NULL) { + remove_proc_entry("device-tree", NULL); pr_debug("/proc/device-tree: can't find root\n"); return; }
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