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gianfar: Replace eieio with wmb for non-PPC archs

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Replace PPC specific eieio() with arch independent wmb()
for other architectures, i.e. ARM.
The eieio() macro is not defined on ARM and generates
build error.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Claudiu Manoil 2014-10-07 10:44:35 +03:00 committed by David S. Miller
parent a4feee89ce
commit d55398ba81
2 changed files with 19 additions and 10 deletions
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13
drivers/net/ethernet/freescale/gianfar.c
View file

@ -165,7 +165,7 @@ static void gfar_init_rxbdp(struct gfar_priv_rx_q *rx_queue, struct rxbd8 *bdp,
if (bdp == rx_queue->rx_bd_base + rx_queue->rx_ring_size - 1)
lstatus |= BD_LFLAG(RXBD_WRAP);
eieio();
gfar_wmb();
bdp->lstatus = lstatus;
}
@ -2371,18 +2371,11 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
*/
spin_lock_irqsave(&tx_queue->txlock, flags);
/* The powerpc-specific eieio() is used, as wmb() has too strong
* semantics (it requires synchronization between cacheable and
* uncacheable mappings, which eieio doesn't provide and which we
* don't need), thus requiring a more expensive sync instruction. At
* some point, the set of architecture-independent barrier functions
* should be expanded to include weaker barriers.
*/
eieio();
gfar_wmb();
txbdp_start->lstatus = lstatus;
eieio(); /* force lstatus write before tx_skbuff */
gfar_wmb(); /* force lstatus write before tx_skbuff */
tx_queue->tx_skbuff[tx_queue->skb_curtx] = skb;

16
drivers/net/ethernet/freescale/gianfar.h
View file

@ -1241,6 +1241,22 @@ static inline int gfar_is_rx_dma_stopped(struct gfar_private *priv)
return gfar_read(&regs->ievent) & IEVENT_GRSC;
}
static inline void gfar_wmb(void)
{
#if defined(CONFIG_PPC)
/* The powerpc-specific eieio() is used, as wmb() has too strong
* semantics (it requires synchronization between cacheable and
* uncacheable mappings, which eieio() doesn't provide and which we
* don't need), thus requiring a more expensive sync instruction. At
* some point, the set of architecture-independent barrier functions
* should be expanded to include weaker barriers.
*/
eieio();
#else
wmb(); /* order write acesses for BD (or FCB) fields */
#endif
}
irqreturn_t gfar_receive(int irq, void *dev_id);
int startup_gfar(struct net_device *dev);
void stop_gfar(struct net_device *dev);