msm: scm: Check for interruption immediately

When we're interrupted on the secure side, we should just issue
another smc instruction again instead of replaying the arguments
to smc. Fix it.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>

diff --git a/arch/arm/mach-msm/scm.c b/arch/arm/mach-msm/scm.c
index 5eddf54..cfa808d 100644 (file)
--- a/arch/arm/mach-msm/scm.c
+++ b/arch/arm/mach-msm/scm.c
@@ -174,15 +174,18 @@ static u32 smc(u32 cmd_addr)
        register u32 r0 asm("r0") = 1;
        register u32 r1 asm("r1") = (u32)&context_id;
        register u32 r2 asm("r2") = cmd_addr;
-       asm volatile(
-               __asmeq("%0", "r0")
-               __asmeq("%1", "r0")
-               __asmeq("%2", "r1")
-               __asmeq("%3", "r2")
-               "smc    #0      @ switch to secure world\n"
-               : "=r" (r0)
-               : "r" (r0), "r" (r1), "r" (r2)
-               : "r3");
+       do {
+               asm volatile(
+                       __asmeq("%0", "r0")
+                       __asmeq("%1", "r0")
+                       __asmeq("%2", "r1")
+                       __asmeq("%3", "r2")
+                       "smc    #0      @ switch to secure world\n"
+                       : "=r" (r0)
+                       : "r" (r0), "r" (r1), "r" (r2)
+                       : "r3");
+       } while (r0 == SCM_INTERRUPTED);
+
        return r0;
 }
 
@@ -197,13 +200,9 @@ static int __scm_call(const struct scm_command *cmd)
         * side in the buffer.
         */
        flush_cache_all();
-       do {
-               ret = smc(cmd_addr);
-               if (ret < 0) {
-                       ret = scm_remap_error(ret);
-                       break;
-               }
-       } while (ret == SCM_INTERRUPTED);
+       ret = smc(cmd_addr);
+       if (ret < 0)
+               ret = scm_remap_error(ret);
 
        return ret;
 }
@@ -274,14 +273,18 @@ u32 scm_get_version(void)
 
        r0 = 0x1 << 8;
        r1 = (u32)&context_id;
-       asm volatile(
-               __asmeq("%0", "r1")
-               __asmeq("%1", "r0")
-               __asmeq("%2", "r1")
-               "smc    #0      @ switch to secure world\n"
-               : "=r" (r1)
-               : "r" (r0), "r" (r1)
-               : "r2", "r3");
+       do {
+               asm volatile(
+                       __asmeq("%0", "r0")
+                       __asmeq("%1", "r1")
+                       __asmeq("%2", "r0")
+                       __asmeq("%3", "r1")
+                       "smc    #0      @ switch to secure world\n"
+                       : "=r" (r0), "=r" (r1)
+                       : "r" (r0), "r" (r1)
+                       : "r2", "r3");
+       } while (r0 == SCM_INTERRUPTED);
+
        version = r1;
        mutex_unlock(&scm_lock);