linux-kernel - [PATCH] staging: zcache: fix cleancache crash

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Message-Id: <1315941562-25422-1-git-send-email-sjenning@linux.vnet.ibm.com>
Date:	Tue, 13 Sep 2011 14:19:22 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	gregkh@...e.de
Cc:	devel@...verdev.osuosl.org, linux-mm@...ck.org, ngupta@...are.org,
	linux-kernel@...r.kernel.org, francis.moro@...il.com,
	dan.magenheimer@...cle.com,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>
Subject: [PATCH] staging: zcache: fix cleancache crash

After commit, c5f5c4db, cleancache crashes on the first
successful get. This was caused by a remaining virt_to_page()
call in zcache_pampd_get_data_and_free() that only gets
run in the cleancache path.

The patch converts the virt_to_page() to struct page
casting like was done for other instances in c5f5c4db.

Based on 3.1-rc4

Signed-off-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>
---
 drivers/staging/zcache/zcache-main.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index a3f5162..462fbc2 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1242,7 +1242,7 @@ static int zcache_pampd_get_data_and_free(char *data, size_t *bufsize, bool raw,
 	int ret = 0;
 
 	BUG_ON(!is_ephemeral(pool));
-	zbud_decompress(virt_to_page(data), pampd);
+	zbud_decompress((struct page *)(data), pampd);
 	zbud_free_and_delist((struct zbud_hdr *)pampd);
 	atomic_dec(&zcache_curr_eph_pampd_count);
 	return ret;
-- 
1.7.4.1

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