From: Matthew Wilcox <willy@infradead.org>
Date: Sat, 10 Nov 2018 01:09:37 +0000 (-0500)
Subject: dax: Make sure the unlocking entry isn't locked
X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~5871^2~5
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=7ae2ea7dc45e8250a74cfaaecdce578427669ae5;p=linux.git

dax: Make sure the unlocking entry isn't locked

I wrote the semantics in the commit message, but didn't document it in
the source code.  Use a BUG_ON instead (if any code does do this, it's
really buggy; we can't recover and it's worth taking the machine down).

Signed-off-by: Matthew Wilcox <willy@infradead.org>
---

diff --git a/fs/dax.c b/fs/dax.c
index 529ac9d7c10a..7944417f5a71 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -255,6 +255,7 @@ static void dax_unlock_entry(struct xa_state *xas, void *entry)
 {
 	void *old;
 
+	BUG_ON(dax_is_locked(entry));
 	xas_reset(xas);
 	xas_lock_irq(xas);
 	old = xas_store(xas, entry);