+static int mmc_gpio_alloc(struct mmc_host *host)
+{
+ size_t len = strlen(dev_name(host->parent)) + 4;
+ struct mmc_gpio *ctx;
+
+ mutex_lock(&host->slot.lock);
+
+ ctx = host->slot.handler_priv;
+ if (!ctx) {
+ /*
+ * devm_kzalloc() can be called after device_initialize(), even
+ * before device_add(), i.e., between mmc_alloc_host() and
+ * mmc_add_host()
+ */
+ ctx = devm_kzalloc(&host->class_dev, sizeof(*ctx) + len,
+ GFP_KERNEL);
+ if (ctx) {
+ snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
+ ctx->cd_gpio = -EINVAL;
+ host->slot.handler_priv = ctx;
+ }
+ }
+
+ mutex_unlock(&host->slot.lock);
+
+ return ctx ? 0 : -ENOMEM;
+}
+