qom/cpu: move cpu_model null check to cpu_class_by_name()

and clean every implementation.

Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20170917232842.14544-1-f4bug@amsat.org>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Artyom Tarasenko <atar4qemu@gmail.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

qom/cpu.c

@@ -316,7 +316,12 @@ static bool cpu_common_has_work(CPUState *cs)
 
 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 {
-    CPUClass *cc = CPU_CLASS(object_class_by_name(typename));
+    CPUClass *cc;
+
+    if (!cpu_model) {
+        return NULL;
+    }
+    cc = CPU_CLASS(object_class_by_name(typename));
 
     return cc->class_by_name(cpu_model);
 }

target/alpha/cpu.c

@@ -127,14 +127,10 @@ static const AlphaCPUAlias alpha_cpu_aliases[] = {
 
 static ObjectClass *alpha_cpu_class_by_name(const char *cpu_model)
 {
-    ObjectClass *oc = NULL;
+    ObjectClass *oc;
     char *typename;
     int i;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     oc = object_class_by_name(cpu_model);
     if (oc != NULL && object_class_dynamic_cast(oc, TYPE_ALPHA_CPU) != NULL &&
         !object_class_is_abstract(oc)) {

target/arm/cpu.c

@@ -939,10 +939,6 @@ static ObjectClass *arm_cpu_class_by_name(const char *cpu_model)
     char *typename;
     char **cpuname;
 
-    if (!cpu_model) {
-        return NULL;
-    }
-
     cpuname = g_strsplit(cpu_model, ",", 1);
     typename = g_strdup_printf(ARM_CPU_TYPE_NAME("%s"), cpuname[0]);
     oc = object_class_by_name(typename);

target/cris/cpu.c

@@ -69,10 +69,6 @@ static ObjectClass *cris_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
 #if defined(CONFIG_USER_ONLY)
     if (strcasecmp(cpu_model, "any") == 0) {
         return object_class_by_name("crisv32-" TYPE_CRIS_CPU);

target/lm32/cpu.c

@@ -246,10 +246,6 @@ static ObjectClass *lm32_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     typename = g_strdup_printf("%s-" TYPE_LM32_CPU, cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

target/m68k/cpu.c

@@ -87,10 +87,6 @@ static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     typename = g_strdup_printf("%s-" TYPE_M68K_CPU, cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

target/mips/cpu.c

@@ -166,10 +166,6 @@ static ObjectClass *mips_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     typename = mips_cpu_type_name(cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

target/moxie/cpu.c

@@ -89,13 +89,7 @@ static void moxie_cpu_initfn(Object *obj)
 
 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
 {
-    ObjectClass *oc;
-
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
-    oc = object_class_by_name(cpu_model);
+    ObjectClass *oc = object_class_by_name(cpu_model);
     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_MOXIE_CPU) ||
                        object_class_is_abstract(oc))) {
         return NULL;

target/openrisc/cpu.c

@@ -108,10 +108,6 @@ static ObjectClass *openrisc_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     typename = g_strdup_printf("%s-" TYPE_OPENRISC_CPU, cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

target/sh4/cpu.c

@@ -133,9 +133,6 @@ static ObjectClass *superh_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     GSList *list, *item;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
     if (strcasecmp(cpu_model, "any") == 0) {
         return object_class_by_name(TYPE_SH7750R_CPU);
     }

target/sparc/cpu.c

@@ -730,10 +730,6 @@ static ObjectClass *sparc_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     typename = sparc_cpu_type_name(cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

target/tricore/cpu.c

@@ -120,10 +120,6 @@ static ObjectClass *tricore_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (!cpu_model) {
-        return NULL;
-    }
-
     typename = g_strdup_printf("%s-" TYPE_TRICORE_CPU, cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

target/unicore32/cpu.c

@@ -44,10 +44,6 @@ static ObjectClass *uc32_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     typename = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

target/xtensa/cpu.c

@@ -83,10 +83,6 @@ static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
     ObjectClass *oc;
     char *typename;
 
-    if (cpu_model == NULL) {
-        return NULL;
-    }
-
     typename = g_strdup_printf("%s-" TYPE_XTENSA_CPU, cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);