[34/91] matroxfb: fix incorrect use of memcpy_toio()

[Greg KH]

2.6.34-stable review patch.  If anyone has any objections, please let us know.

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

From: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>

commit c81476df1b4241aefba4ff83a7701b3a926bd7ce upstream.

Screen is completely corrupted since 2.6.34.  Bisection revealed that it's
caused by commit 6175ddf06b61720 ("x86: Clean up mem*io functions.").

H.  Peter Anvin explained that memcpy_toio() does not copy data in 32bit
chunks anymore on x86.

Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Petr Vandrovec <vandrove@xxxxxxxxxx>
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/video/matrox/matroxfb_base.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/video/matrox/matroxfb_base.h
+++ b/drivers/video/matrox/matroxfb_base.h
@@ -151,13 +151,13 @@ static inline void mga_writel(vaddr_t va
 static inline void mga_memcpy_toio(vaddr_t va, const void* src, int len) {
 #if defined(__alpha__) || defined(__i386__) || defined(__x86_64__)
 	/*
-	 * memcpy_toio works for us if:
+	 * iowrite32_rep works for us if:
 	 *  (1) Copies data as 32bit quantities, not byte after byte,
 	 *  (2) Performs LE ordered stores, and
 	 *  (3) It copes with unaligned source (destination is guaranteed to be page
 	 *      aligned and length is guaranteed to be multiple of 4).
 	 */
-	memcpy_toio(va.vaddr, src, len);
+	iowrite32_rep(va.vaddr, src, len >> 2);
 #else
         u_int32_t __iomem* addr = va.vaddr;
 


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