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JFFS2 locking regression fix.

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Commit a491486a2087ac3dfc00efb4f838c8d684afaf54 introduced a locking
problem in JFFS2 -- we up() the alloc_sem when we weren't previously
holding it. This leads to all kinds of fun behaviour later.

There was a _reason_ for the
	if (1 /* alternative path needs testing */ ||
which the above-mentioned commit removed :)

Discovered and debugged by Giulio Fedel <giulio.fedel@andorsystems.com>

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Woodhouse 2007-08-20 11:05:29 +01:00 committed by Linus Torvalds
parent 2046219364
commit b574864333
1 changed files with 3 additions and 0 deletions
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3
fs/jffs2/write.c
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@ -566,6 +566,9 @@ int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
struct jffs2_full_dirent **prev = &dir_f->dents;
uint32_t nhash = full_name_hash(name, namelen);
/* We don't actually want to reserve any space, but we do
want to be holding the alloc_sem when we write to flash */
down(&c->alloc_sem);
down(&dir_f->sem);
while ((*prev) && (*prev)->nhash <= nhash) {