linux-kernel - [PATCH] agp: fix scratch page cleanup

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Message-Id: <20120125161350.82538402A7@alaris.suse.cz>
Date:	Wed, 25 Jan 2012 16:51:05 +0100
From:	Michal Kubecek <mkubecek@...e.cz>
To:	David Airlie <airlied@...ux.ie>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] agp: fix scratch page cleanup

In error cleanup of agp_backend_initialize() and in agp_backend_cleanup(),
agp_destroy_page() is passed virtual address of the scratch page. This
leads to a kernel warning if the initialization fails (or upon regular
cleanup) as pointer to struct page should be passed instead.

Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
 drivers/char/agp/backend.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
index 4b71647..317c28c 100644
--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -194,10 +194,10 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
 
 err_out:
 	if (bridge->driver->needs_scratch_page) {
-		void *va = page_address(bridge->scratch_page_page);
+		struct page *page = bridge->scratch_page_page;
 
-		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
-		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
+		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
+		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
 	}
 	if (got_gatt)
 		bridge->driver->free_gatt_table(bridge);
@@ -221,10 +221,10 @@ static void agp_backend_cleanup(struct agp_bridge_data *bridge)
 
 	if (bridge->driver->agp_destroy_page &&
 	    bridge->driver->needs_scratch_page) {
-		void *va = page_address(bridge->scratch_page_page);
+		struct page *page = bridge->scratch_page_page;
 
-		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
-		bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
+		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP);
+		bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE);
 	}
 }
 
-- 
1.7.7

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