From e51a1ac2dfca9ad869471e88f828281db7e810c0 Mon Sep 17 00:00:00 2001
From: Harvey Harrison <harvey.harrison@gmail.com>
Date: Tue, 23 Sep 2008 15:20:09 -0700
Subject: [PATCH] x86, olpc: fix endian bug in openfirmware workaround
Boardrev is always treated as a u32 everywhere else, no reason to
byteswap the 0xc2 value. The only use is to print out if it is
a prerelease board, the test being:
(olpc_platform_info.boardrev & 0xf) < 8
Which is currently always true as be32_to_cpu(0xc2) & 0xf = 0
but I doubt that was the intention here. The consequences of the bug
are pretty minor though (incorrect boardrev displayed in dmesg when
ofw support not configured)
Also annotate the temporary used to read the boardrev in the ofw
case.
The confusion was noticed by Sparse:
arch/x86/kernel/olpc.c:206:32: warning: cast to restricted __be32
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/olpc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/olpc.c b/arch/x86/kernel/olpc.c
index 3e6672274807f..7a13fac63a1f1 100644
--- a/arch/x86/kernel/olpc.c
+++ b/arch/x86/kernel/olpc.c
@@ -190,12 +190,12 @@ EXPORT_SYMBOL_GPL(olpc_ec_cmd);
static void __init platform_detect(void)
{
size_t propsize;
- u32 rev;
+ __be32 rev;
if (ofw("getprop", 4, 1, NULL, "board-revision-int", &rev, 4,
&propsize) || propsize != 4) {
printk(KERN_ERR "ofw: getprop call failed!\n");
- rev = 0;
+ rev = cpu_to_be32(0);
}
olpc_platform_info.boardrev = be32_to_cpu(rev);
}
@@ -203,7 +203,7 @@ static void __init platform_detect(void)
static void __init platform_detect(void)
{
/* stopgap until OFW support is added to the kernel */
- olpc_platform_info.boardrev = be32_to_cpu(0xc2);
+ olpc_platform_info.boardrev = 0xc2;
}
#endif
--
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