1 files changed, 97 insertions, 45 deletions

diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index 423e450efe07..76caa4a45ccd 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -418,84 +418,136 @@ void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog,
 	}
 }
 
-static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
-			   const char *buf, size_t count)
+static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
 {
-	struct pseries_hp_errorlog *hp_elog;
-	struct completion hotplug_done;
-	const char *arg;
-	int rc;
+	char *arg;
 
-	hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL);
-	if (!hp_elog) {
-		rc = -ENOMEM;
-		goto dlpar_store_out;
-	}
+	arg = strsep(cmd, " ");
+	if (!arg)
+		return -EINVAL;
 
-	/* Parse out the request from the user, this will be in the form
-	 * <resource> <action> <id_type> <id>
-	 */
-	arg = buf;
-	if (!strncmp(arg, "memory", 6)) {
+	if (sysfs_streq(arg, "memory")) {
 		hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
-		arg += strlen("memory ");
-	} else if (!strncmp(arg, "cpu", 3)) {
+	} else if (sysfs_streq(arg, "cpu")) {
 		hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
-		arg += strlen("cpu ");
 	} else {
-		pr_err("Invalid resource specified: \"%s\"\n", buf);
-		rc = -EINVAL;
-		goto dlpar_store_out;
+		pr_err("Invalid resource specified.\n");
+		return -EINVAL;
 	}
 
-	if (!strncmp(arg, "add", 3)) {
+	return 0;
+}
+
+static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
+{
+	char *arg;
+
+	arg = strsep(cmd, " ");
+	if (!arg)
+		return -EINVAL;
+
+	if (sysfs_streq(arg, "add")) {
 		hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
-		arg += strlen("add ");
-	} else if (!strncmp(arg, "remove", 6)) {
+	} else if (sysfs_streq(arg, "remove")) {
 		hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
-		arg += strlen("remove ");
 	} else {
-		pr_err("Invalid action specified: \"%s\"\n", buf);
-		rc = -EINVAL;
-		goto dlpar_store_out;
+		pr_err("Invalid action specified.\n");
+		return -EINVAL;
 	}
 
-	if (!strncmp(arg, "index", 5)) {
-		u32 index;
+	return 0;
+}
 
+static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
+{
+	char *arg;
+	u32 count, index;
+
+	arg = strsep(cmd, " ");
+	if (!arg)
+		return -EINVAL;
+
+	if (sysfs_streq(arg, "index")) {
 		hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
-		arg += strlen("index ");
+		arg = strsep(cmd, " ");
+		if (!arg) {
+			pr_err("No DRC Index specified.\n");
+			return -EINVAL;
+		}
+
 		if (kstrtou32(arg, 0, &index)) {
-			rc = -EINVAL;
-			pr_err("Invalid drc_index specified: \"%s\"\n", buf);
-			goto dlpar_store_out;
+			pr_err("Invalid DRC Index specified.\n");
+			return -EINVAL;
 		}
 
 		hp_elog->_drc_u.drc_index = cpu_to_be32(index);
-	} else if (!strncmp(arg, "count", 5)) {
-		u32 count;
-
+	} else if (sysfs_streq(arg, "count")) {
 		hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
-		arg += strlen("count ");
+		arg = strsep(cmd, " ");
+		if (!arg) {
+			pr_err("No DRC count specified.\n");
+			return -EINVAL;
+		}
+
 		if (kstrtou32(arg, 0, &count)) {
-			rc = -EINVAL;
-			pr_err("Invalid count specified: \"%s\"\n", buf);
-			goto dlpar_store_out;
+			pr_err("Invalid DRC count specified.\n");
+			return -EINVAL;
 		}
 
 		hp_elog->_drc_u.drc_count = cpu_to_be32(count);
 	} else {
-		pr_err("Invalid id_type specified: \"%s\"\n", buf);
-		rc = -EINVAL;
-		goto dlpar_store_out;
+		pr_err("Invalid id_type specified.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct pseries_hp_errorlog *hp_elog;
+	struct completion hotplug_done;
+	char *argbuf;
+	char *args;
+	int rc;
+
+	args = argbuf = kstrdup(buf, GFP_KERNEL);
+	hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL);
+	if (!hp_elog || !argbuf) {
+		pr_info("Could not allocate resources for DLPAR operation\n");
+		kfree(argbuf);
+		kfree(hp_elog);
+		return -ENOMEM;
 	}
 
+	/*
+	 * Parse out the request from the user, this will be in the form:
+	 * <resource> <action> <id_type> <id>
+	 */
+	rc = dlpar_parse_resource(&args, hp_elog);
+	if (rc)
+		goto dlpar_store_out;
+
+	rc = dlpar_parse_action(&args, hp_elog);
+	if (rc)
+		goto dlpar_store_out;
+
+	rc = dlpar_parse_id_type(&args, hp_elog);
+	if (rc)
+		goto dlpar_store_out;
+
 	init_completion(&hotplug_done);
 	queue_hotplug_event(hp_elog, &hotplug_done, &rc);
 	wait_for_completion(&hotplug_done);
 
 dlpar_store_out:
+	kfree(argbuf);
 	kfree(hp_elog);
+
+	if (rc)
+		pr_err("Could not handle DLPAR request \"%s\"\n", buf);
+
 	return rc ? rc : count;
 }