linux-kernel - [PATCH 3.12 015/116] staging: ashmem: Fix ASHMEM_PURGE_ALL

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Date:	Tue, 26 Nov 2013 16:56:28 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Colin Cross <ccross@...roid.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	Glauber Costa <glommer@...nvz.org>,
	YongQin Liu <yongqin.liu@...aro.org>,
	John Stultz <john.stultz@...aro.org>,
	Dave Chinner <dchinner@...hat.com>
Subject: [PATCH 3.12 015/116] staging: ashmem: Fix ASHMEM_PURGE_ALL_CACHES return value

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: John Stultz <john.stultz@...aro.org>

commit 5957324045ba2c127c9401fa3ac61ac52e043ca8 upstream.

Hopefully this isn't too late for 3.12.

In commit 7dc19d5aff (convert shrinkers to new count/scan API)
the return value to PURGE_ALL_CACHES was dropped, causing -EPERM
to always be returned.

This patch re-adds the ret assignment, setting it to the the
ashmem_shrink_count(), which is the lru_count.

(Sorry this was missed in the review!)

Fixes: 7dc19d5affd7 ("convert shrinkers to new count/scan API")
Cc: Colin Cross <ccross@...roid.com>
Cc: Android Kernel Team <kernel-team@...roid.com>
Cc: Glauber Costa <glommer@...nvz.org>
Reported-by: YongQin Liu <yongqin.liu@...aro.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
Acked-by: Dave Chinner <dchinner@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -706,7 +706,7 @@ static long ashmem_ioctl(struct file *fi
 				.gfp_mask = GFP_KERNEL,
 				.nr_to_scan = LONG_MAX,
 			};
-
+			ret = ashmem_shrink_count(&ashmem_shrinker, &sc);
 			nodes_setall(sc.nodes_to_scan);
 			ashmem_shrink_scan(&ashmem_shrinker, &sc);
 		}


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