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net: dm9000: Correctly handle empty FIFO

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Assign packet pointer only in case the MAC reports anything in the FIFO.
In case the MAC indicates empty FIFO, return 0 to pass that information
to the network stack.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Marek Vasut 2022-04-25 20:28:05 +02:00 committed by Tom Rini
parent 01207947d5
commit ecd8b03713
1 changed files with 2 additions and 2 deletions
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4
drivers/net/dm9000x.c
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@ -666,10 +666,10 @@ static int dm9000_recv(struct udevice *dev, int flags, uchar **packetp)
int ret;
ret = dm9000_recv_common(db, data);
if (ret)
if (ret > 0)
*packetp = (void *)data;
return ret ? ret : -EAGAIN;
return ret >= 0 ? ret : -EAGAIN;
}
static int dm9000_write_hwaddr(struct udevice *dev)