From: Alan Cox <alan@lxorguk.ukuu.org.uk>

We must exit immediately on a FIFO fill not take the end of packet path
otherwise each underrun in PIO transmit mode causes a runt packet and the
data is lost.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/net/wan/z85230.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN drivers/net/wan/z85230.c~z85230-fix-fifo-handling drivers/net/wan/z85230.c
--- a/drivers/net/wan/z85230.c~z85230-fix-fifo-handling
+++ a/drivers/net/wan/z85230.c
@@ -407,7 +407,7 @@ static void z8530_tx(struct z8530_channe
 	while(c->txcount) {
 		/* FIFO full ? */
 		if(!(read_zsreg(c, R0)&4))
-			break;
+			return;
 		c->txcount--;
 		/*
 		 *	Shovel out the byte
_