MIPS: Fix race condition in module relocation code.

The relocation code was essentially taken from the 2.4 modutils which
perform relocation in userspace.  In 2.6 relocation of multiple modules
may be performed in parallel by the in-kernel loader so the global
variable mips_hi16_list won't fly anymore.  Fix race by moving it into
mod_arch_specific.

[ralf@linux-mips.org: folded in Tony's followup fix.  Thanks Tony!]

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Tony Wu <tung7970@gmail.com>
Cc:  linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/4189/

1 files changed, 6 insertions, 7 deletions

diff --git a/arch/mips/kernel/module.c b/arch/mips/kernel/module.c
index e5f2f56524e..8e1fb802c3e 100644
--- a/arch/mips/kernel/module.c
+++ b/arch/mips/kernel/module.c
@@ -39,8 +39,6 @@ struct mips_hi16 {
         Elf_Addr value;
 };
 
-static struct mips_hi16 *mips_hi16_list;
-
 static LIST_HEAD(dbe_list);
 static DEFINE_SPINLOCK(dbe_lock);
 
@@ -128,8 +126,8 @@ static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
 
         n->addr = (Elf_Addr *)location;
         n->value = v;
-        n->next = mips_hi16_list;
-        mips_hi16_list = n;
+        n->next = me->arch.r_mips_hi16_list;
+        me->arch.r_mips_hi16_list = n;
 
         return 0;
 }
@@ -151,9 +149,9 @@ static int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v)
         /* Sign extend the addend we extract from the lo insn.  */
         vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
 
-        if (mips_hi16_list != NULL) {
+        if (me->arch.r_mips_hi16_list != NULL) {
 
-                l = mips_hi16_list;
+                l = me->arch.r_mips_hi16_list;
                 while (l != NULL) {
                         unsigned long insn;
 
@@ -187,7 +185,7 @@ static int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v)
                         l = next;
                 }
 
-                mips_hi16_list = NULL;
+                me->arch.r_mips_hi16_list = NULL;
         }
 
         /*
@@ -278,6 +276,7 @@ int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
         pr_debug("Applying relocate section %u to %u\n", relsec,
                sechdrs[relsec].sh_info);
 
+        me->arch.r_mips_hi16_list = NULL;
         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
                 /* This is where to make the change */
                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr