x86, setup: Fix earlyprintk=serial,ttyS0,115200

Torsten reported that there is garbage output,
after commit 8fee13a48e4879fba57725f6d9513df4bfa8e9f3 (x86,
setup: enable early console output from the decompressor)

It turns out we missed the offset for that case.

Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4C7B0578.8090807@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/boot/early_serial_console.c b/arch/x86/boot/early_serial_console.c
index 030f4b93e255ac00c9cd646a733eda26733a5324..407a8e26f0a7f2bae0748e5995b65816f9e5a45f 100644 (file)
--- a/arch/x86/boot/early_serial_console.c
+++ b/arch/x86/boot/early_serial_console.c
@@ -58,7 +58,7 @@ static void parse_earlyprintk(void)
                if (arg[pos] == ',')
                        pos++;
 
-               if (!strncmp(arg, "ttyS", 4)) {
+               if (!strncmp(arg + pos, "ttyS", 4)) {
                        static const int bases[] = { 0x3f8, 0x2f8 };
                        int idx = 0;