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| author | Finn Thain <fthain@telegraphics.com.au> | 2020-01-23 09:07:26 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-29 16:43:21 +0100 |
| commit | 5205e9b20840a3f58a095b03503bba82dac56c45 (patch) | |
| tree | b686a63bfbcd82f2049682c9ed4e9f2ad63cd9bb | |
| parent | b9ef3fe67d108b329e448d9dc8d23272a7495c4f (diff) | |
| download | linux-stable-5205e9b20840a3f58a095b03503bba82dac56c45.tar.gz linux-stable-5205e9b20840a3f58a095b03503bba82dac56c45.tar.bz2 linux-stable-5205e9b20840a3f58a095b03503bba82dac56c45.zip | |
net/sonic: Use MMIO accessors
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@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/ethernet/natsemi/sonic.h | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/net/ethernet/natsemi/sonic.h b/drivers/net/ethernet/natsemi/sonic.h index f9506863e9d1..fb160dfdf4ca 100644 --- a/drivers/net/ethernet/natsemi/sonic.h +++ b/drivers/net/ethernet/natsemi/sonic.h @@ -345,30 +345,30 @@ static void sonic_msg_init(struct net_device *dev); 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 */ |