x86/microcode/AMD: Make find_proper_container() sane again

Fixup signature and retvals, return the container struct through the
passed in pointer, not as a function return value.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Jürgen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: http://lkml.kernel.org/r/20161218164414.9649-2-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 11 insertions, 9 deletions

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 6f353bdb3a25..31f4e3f94d46 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -116,10 +116,11 @@ static inline u16 find_equiv_id(struct equiv_cpu_entry *equiv_cpu_table,
 
 /*
  * This scans the ucode blob for the proper container as we can have multiple
- * containers glued together.
+ * containers glued together. Returns the equivalence ID from the equivalence
+ * table or 0 if none found.
  */
-static struct container
-find_proper_container(u8 *ucode, size_t size, u16 *ret_id)
+static u16
+find_proper_container(u8 *ucode, size_t size, struct container *ret_cont)
 {
         struct container ret = { NULL, 0 };
         u32 eax, ebx, ecx, edx;
@@ -138,7 +139,7 @@ find_proper_container(u8 *ucode, size_t size, u16 *ret_id)
         if (header[0] != UCODE_MAGIC ||
             header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
             header[2] == 0)                            /* size */
-                return ret;
+                return eq_id;
 
         eax = 0x00000001;
         ecx = 0;
@@ -163,8 +164,9 @@ find_proper_container(u8 *ucode, size_t size, u16 *ret_id)
                          * ucode update loop below
                          */
                         left = ret.size - offset;
-                        *ret_id = eq_id;
-                        return ret;
+
+                        *ret_cont = ret;
+                        return eq_id;
                 }
 
                 /*
@@ -189,7 +191,7 @@ find_proper_container(u8 *ucode, size_t size, u16 *ret_id)
                 ucode     = data;
         }
 
-        return ret;
+        return eq_id;
 }
 
 static int __apply_microcode_amd(struct microcode_amd *mc_amd)
@@ -237,7 +239,7 @@ apply_microcode_early_amd(void *ucode, size_t size, bool save_patch)
         if (check_current_patch_level(&rev, true))
                 return (struct container){ NULL, 0 };
 
-        ret = find_proper_container(ucode, size, &eq_id);
+        eq_id = find_proper_container(ucode, size, &ret);
         if (!eq_id)
                 return (struct container){ NULL, 0 };
 
@@ -443,7 +445,7 @@ int __init save_microcode_in_initrd_amd(unsigned int fam)
                                 return -EINVAL;
                         }
 
-                        cont = find_proper_container(cp.data, cp.size, &eq_id);
+                        eq_id = find_proper_container(cp.data, cp.size, &cont);
                         if (!eq_id) {
                                 cont.size = -1;
                                 return -EINVAL;