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authorAlbert Herranz <albert_herranz@yahoo.es>2009-12-17 08:33:41 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-12-18 15:13:57 +1100
commit698cd335a782561b79504d4e98c7df62b08e7abd (patch)
tree44b3056c81ff1032ffd6c6681cf9e08c12746af8
parent38e1313fc753482b93aa6c6f11cfbd43a5bcd963 (diff)
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>
-rw-r--r--arch/powerpc/boot/ugecon.c2
-rw-r--r--arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/boot/ugecon.c b/arch/powerpc/boot/ugecon.c
index 50609ea6ddf..8f2a6b31153 100644
--- a/arch/powerpc/boot/ugecon.c
+++ b/arch/powerpc/boot/ugecon.c
@@ -86,7 +86,7 @@ static void ug_putc(char ch)
while (!ug_is_txfifo_ready() && count--)
barrier();
- if (count)
+ if (count >= 0)
ug_raw_putc(ch);
}
diff --git a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
index edc956cc8b1..20a8ed91962 100644
--- a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
+++ b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
@@ -120,7 +120,7 @@ static void ug_putc(char ch)
while (!ug_is_txfifo_ready() && count--)
barrier();
- if (count)
+ if (count >= 0)
ug_raw_putc(ch);
}