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powerpc/gamecube/wii: Fix off-by-one error in ugecon/usbgecko_udbg 

The retry logic in ug_putc() is broken.

If the TX fifo is not ready and the counter runs out it will have a
value of -1 and no transfer should be attempted. Also, a counter
with a value of 0 means that the TX fifo got ready in the last try
and the transfer should be attempted.

Reported-by: "Juha Leppanen" <juha_motorsportcom@luukku.com>
Signed-off-by: "Juha Leppanen" <juha_motorsportcom@luukku.com>
Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Albert Herranz 2009-12-17 08:33:41 +00:00 committed by Benjamin Herrenschmidt
parent 38e1313fc7
commit 698cd335a7
2 changed files with 2 additions and 2 deletions
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2
arch/powerpc/boot/ugecon.c
View File

@ -86,7 +86,7 @@ static void ug_putc(char ch)
while (!ug_is_txfifo_ready() && count--) while (!ug_is_txfifo_ready() && count--)
barrier(); barrier();
if (count) if (count >= 0)
ug_raw_putc(ch); ug_raw_putc(ch);
} }

2
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
View File

@ -120,7 +120,7 @@ static void ug_putc(char ch)
while (!ug_is_txfifo_ready() && count--) while (!ug_is_txfifo_ready() && count--)
barrier(); barrier();
if (count) if (count >= 0)
ug_raw_putc(ch); ug_raw_putc(ch);
} }