[PATCH -mm] module: fix __find_symbl() error checks

[PATCH -mm] module: fix __find_symbl() error checks

[Akinobu Mita]

The patch:

http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24/2.6.24-mm1/broken-out/modules-handle-symbols-that-have-a-zero-value.patch

changes the return value of __find_symbol() so that it can handle symbols
that are zero and now it returns -errno for failure.

But some __find_symbl() error checks remain unchanged.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christoph Lameter <clameter@sgi.com>
---
 kernel/module.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: 2.6.24-mm1/kernel/module.c
===================================================================
--- 2.6.24-mm1.orig/kernel/module.c
+++ 2.6.24-mm1/kernel/module.c
@@ -977,7 +977,7 @@ static unsigned long resolve_symbol(Elf_
 
 	ret = __find_symbol(name, &owner, &crc,
 			!(mod->taints & TAINT_PROPRIETARY_MODULE));
-	if (ret) {
+	if (!IS_ERR_VALUE(ret)) {
 		/* use_module can fail due to OOM,
 		   or module initialization or unloading */
 		if (!check_version(sechdrs, versindex, name, mod, crc) ||
@@ -1370,7 +1370,9 @@ void *__symbol_get(const char *symbol)
 
 	preempt_disable();
 	value = __find_symbol(symbol, &owner, &crc, 1);
-	if (value && strong_try_module_get(owner) != 0)
+	if (IS_ERR_VALUE(value))
+		value = 0;
+	else if (strong_try_module_get(owner))
 		value = 0;
 	preempt_enable();