3.16.83-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> commit e3885f576196ddfc670b3d53e745de96ffcb49ab upstream. The driver accesses descriptor memory which is simultaneously accessed by the chip, so the compiler must not be allowed to re-order CPU accesses. sonic_buf_get() used 'volatile' to prevent that. sonic_buf_put() should have done so too but was overlooked. Fixes: efcce839360f ("[PATCH] macsonic/jazzsonic network drivers update") Tested-by: Stan Johnson <userm57@xxxxxxxxx> Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- drivers/net/ethernet/natsemi/sonic.h | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/net/ethernet/natsemi/sonic.h +++ b/drivers/net/ethernet/natsemi/sonic.h @@ -342,30 +342,30 @@ static void sonic_tx_timeout(struct net_ as far as we can tell. */ /* OpenBSD calls this "SWO". I'd like to think that sonic_buf_put() is a much better name. */ -static inline void sonic_buf_put(void* base, int bitmode, +static inline void sonic_buf_put(u16 *base, int bitmode, int offset, __u16 val) { if (bitmode) #ifdef __BIG_ENDIAN - ((__u16 *) base + (offset*2))[1] = val; + __raw_writew(val, base + (offset * 2) + 1); #else - ((__u16 *) base + (offset*2))[0] = val; + __raw_writew(val, base + (offset * 2) + 0); #endif else - ((__u16 *) base)[offset] = val; + __raw_writew(val, base + (offset * 1) + 0); } -static inline __u16 sonic_buf_get(void* base, int bitmode, +static inline __u16 sonic_buf_get(u16 *base, int bitmode, int offset) { if (bitmode) #ifdef __BIG_ENDIAN - return ((volatile __u16 *) base + (offset*2))[1]; + return __raw_readw(base + (offset * 2) + 1); #else - return ((volatile __u16 *) base + (offset*2))[0]; + return __raw_readw(base + (offset * 2) + 0); #endif else - return ((volatile __u16 *) base)[offset]; + return __raw_readw(base + (offset * 1) + 0); } /* Inlines that you should actually use for reading/writing DMA buffers */