Correctly handle RX errors in ravb_recv() by returning 0 instead of -EAGAIN on RX error.
In case the RAVB driver detects an RX error in ravb_recv(), it must not return the -EAGAIN, but instead must return 0. Both error codes are handled in eth-uclass.c eth_rx() and -EAGAIN is rewritten to 0 at the end of eth_rx(), but negative return code from the .recv() callback does not trigger .free_pkt() callback, which would clean up and re-enqueue the descriptor which holds the currently received corrupted packet. The .free_pkt() must be called for this descriptor, otherwise the follow up received data become corrupted too, even if those packets are correctly received. Returning 0 from the .recv() callback assures the corrupted packet is not processed by the network stack, but is skipped instead. For TFTP loading, an RX error produces the timeout "T" output and resumes the TFTP loading operation shortly afterward, without any data corruption. Signed-off-by: Marek Vasut <marek.vasut+rene...@mailbox.org> --- Cc: Joe Hershberger <joe.hershber...@ni.com> Cc: Nobuhiro Iwamatsu <iwama...@nigauri.org> Cc: Paul Barker <paul.barker...@bp.renesas.com> Cc: Ramon Fried <rfried....@gmail.com> Cc: Tom Rini <tr...@konsulko.com> Cc: u-boot@lists.denx.de --- drivers/net/ravb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ravb.c b/drivers/net/ravb.c index 539fd37ee59..da3e9dbeacd 100644 --- a/drivers/net/ravb.c +++ b/drivers/net/ravb.c @@ -192,7 +192,7 @@ static int ravb_recv(struct udevice *dev, int flags, uchar **packetp) /* Check for errors */ if (desc->data.ctrl & RAVB_RX_DESC_MSC_RX_ERR_MASK) { desc->data.ctrl &= ~RAVB_RX_DESC_MSC_MASK; - return -EAGAIN; + return 0; } len = desc->data.ctrl & RAVB_DESC_DS_MASK; -- 2.47.2