bgmac: fix DMA rx corruption

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The driver needs to inform the hardware about the first invalid (not yet
filled) rx slot, by writing its DMA descriptor pointer offset to the
BGMAC_DMA_RX_INDEX register.

This register was set to a value exceeding the rx ring size, effectively
allowing the hardware constant access to the full ring, regardless of
which slots are initialized.

To fix this issue, always mark the last filled rx slot as invalid.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Felix Fietkau 2015-04-14 12:08:01 +02:00 • committed by David S. Miller

parent 74b6f29163

commit 4668ae1fbc

1 changed files with 18 additions and 9 deletions

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27

drivers/net/ethernet/broadcom/bgmac.c

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