RTAS manipulates its input and output arguments in big endian order.
I have looked at factoring some lines with rtas_call() but it is not really
worth it because of the variable arguments.
Signed-off-by: Greg Kurz <gk...@linux.vnet.ibm.com>
---
arch/powerpc/kernel/rtas.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 4cf674d..00dbe36 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -1020,6 +1020,7 @@ asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
char *buff_copy, *errbuf = NULL;
int nargs;
int rc;
+ int i;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -1056,9 +1057,19 @@ asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
flags = lock_rtas();
- rtas.args = args;
+ rtas.args.token = cpu_to_be32(args.token);
+ rtas.args.nargs = cpu_to_be32(args.nargs);
+ rtas.args.nret = cpu_to_be32(args.nret);
+ for (i = 0; i < nargs; ++i)
+ rtas.args.args[i] = cpu_to_be32(args.args[i]);
+ rtas.args.rets = &rtas.args.args[nargs];
+ for (i = 0; i < args.nret; ++i)
+ rtas.args.rets[i] = 0;
+
enter_rtas(__pa(&rtas.args));
- args = rtas.args;
+
+ for (i = 0; i < args.nret; ++i)
+ args.rets[i] = be32_to_cpu(rtas.args.rets[i]);
/* A -1 return code indicates that the last command couldn't
be completed due to a hardware error. */
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