net: fec: fix potential issue to avoid fec interrupt lost and crc error
authorDuan Fugang-B38611 <B38611@freescale.com>
Thu, 20 Feb 2014 10:14:39 +0000 (18:14 +0800)
committerDavid S. Miller <davem@davemloft.net>
Thu, 20 Feb 2014 18:16:13 +0000 (13:16 -0500)
commitfb8ef788680d48523321e5f150b23700a1caf980
tree5ed3d875d32a6e6b3b63808e5144ab9d4fec7356
parentcf71d2bc0b8a473209d5c770ce560853bd720d14
net: fec: fix potential issue to avoid fec interrupt lost and crc error

The current flow: Set TX BD ready, and then set "INT" and "PINS" bit to
enable tx interrupt generation and crc checksum.

There has potential issue like as:
CPU fec uDMA
Set tx ready bit
uDMA start the BD transmission
Set "INT" bit
Set "PINS" bit
...

Above situation cause fec tx interrupt lost and fec MAC don't do
CRC checksum. The patch fix the potential issue.

Signed-off-by: Fugang Duan <B38611@freescale.com>
Acked-by: Frank Li <Frank.li@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/freescale/fec_main.c