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UBI: eliminate possible undefined behaviour 

The assignment to pos when rb is finally NULL is undefined behaviour.
Upon seeing that assignment, GCC may assume that rb is not NULL, and
the loop condition ``rb'' may be optimised away.

Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Phil Carmody 2009-07-23 15:29:10 +02:00 committed by Artem Bityutskiy
parent 4a406856ea
commit 758d8e4634
1 changed files with 2 additions and 1 deletions
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3
drivers/mtd/ubi/ubi.h
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@ -579,7 +579,8 @@ void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
for (rb = rb_first(root), \
pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \
rb; \
rb = rb_next(rb), pos = container_of(rb, typeof(*pos), member))
rb = rb_next(rb), \
pos = (rb ? container_of(rb, typeof(*pos), member) : NULL))
/**
* ubi_zalloc_vid_hdr - allocate a volume identifier header object.