linux-kernel - [patch 1/1] staging: zcache: fix cleancache crash

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Date:	Tue, 20 Sep 2011 13:09:56 -0700
From:	Greg KH <gregkh@...e.de>
To:	torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	dan.magenheimer@...cle.com, francis.moro@...il.com,
	ngupta@...are.org
Subject: [patch 1/1] staging: zcache: fix cleancache crash


From: Seth Jennings <sjenning@...ux.vnet.ibm.com>

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.


Signed-off-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>
Tested-By: Valdis Kletnieks <valdis.kletnieks@...edu>
Acked-by: Dan Magenheimer <dan.magenheimer@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/zcache/zcache-main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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_fre
 	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;

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