fs/proc/proc_devtree.c: remove empty /proc/device-tree when no openfirmware exists.
authorDave Jones <davej@redhat.com>
Thu, 23 Jan 2014 23:55:43 +0000 (15:55 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 24 Jan 2014 00:37:01 +0000 (16:37 -0800)
commitc1d867a54d426b45da017fbe8e585f8a3064ce8d
tree725610a41785b7f1fb19606f2e5961ce0b857827
parentcdf7e8dded6212cb29f758017a613e4eefc4ce9e
fs/proc/proc_devtree.c: remove empty /proc/device-tree when no openfirmware exists.

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>
fs/proc/proc_devtree.c