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net: bcmgenet: cleanup for dmadesc_set() 

dmadesc_set() is used for setting the Tx buffer DMA address, length,
and status bits on a Tx ring descriptor when a frame is being Tx'ed.

Always set the Tx buffer DMA address first, before updating the length
and status bits, i.e. giving the Tx descriptor to the hardware.

The reason this is a cleanup rather than a fix is that the hardware
won't transmit anything from a Tx ring until the TDMA producer index
has been incremented. As long as the dmadesc_set() writes complete
before the TDMA producer index write, life is good.

Signed-off-by: Petri Gynther <pgynther@google.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Petri Gynther 2016-04-05 14:00:01 -07:00 committed by David S. Miller
parent 824ba60357
commit 7ee4062562
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@ -104,8 +104,8 @@ static inline void dmadesc_set_addr(struct bcmgenet_priv *priv,
static inline void dmadesc_set(struct bcmgenet_priv *priv,
void __iomem *d, dma_addr_t addr, u32 val)
{
dmadesc_set_length_status(priv, d, val);
dmadesc_set_addr(priv, d, addr);
dmadesc_set_length_status(priv, d, val);
}
static inline dma_addr_t dmadesc_get_addr(struct bcmgenet_priv *priv,