PCI: endpoint: Simplify name allocation for EPF device

This commit replaces allocating and freeing the intermediate
'buf'/'func_name' with a combination of 'kstrndup()' and 'len'.

'len' is the required length of 'epf->name'.
'epf->name' should be either the first part of 'name' preceding the '.'
or the complete 'name', if there is no '.' in the name.

Signed-off-by: Rolf Evers-Fischer <rolf.evers.fischer@aptiv.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

drivers/pci/endpoint/pci-epf-core.c

@@ -200,8 +200,7 @@ struct pci_epf *pci_epf_create(const char *name)
 	int ret;
 	struct pci_epf *epf;
 	struct device *dev;
-	char *func_name;
-	char *buf;
+	int len;
 
 	epf = kzalloc(sizeof(*epf), GFP_KERNEL);
 	if (!epf) {
@@ -209,20 +208,11 @@ struct pci_epf *pci_epf_create(const char *name)
 		goto err_ret;
 	}
 
-	buf = kstrdup(name, GFP_KERNEL);
-	if (!buf) {
-		ret = -ENOMEM;
-		goto free_epf;
-	}
-
-	func_name = buf;
-	buf = strchrnul(buf, '.');
-	*buf = '\0';
-
-	epf->name = kstrdup(func_name, GFP_KERNEL);
+	len = strchrnul(name, '.') - name;
+	epf->name = kstrndup(name, len, GFP_KERNEL);
 	if (!epf->name) {
 		ret = -ENOMEM;
-		goto free_func_name;
+		goto free_epf;
 	}
 
 	dev = &epf->dev;
@@ -238,16 +228,12 @@ struct pci_epf *pci_epf_create(const char *name)
 	if (ret)
 		goto put_dev;
 
-	kfree(func_name);
 	return epf;
 
 put_dev:
 	put_device(dev);
 	kfree(epf->name);
 
-free_func_name:
-	kfree(func_name);
-
 free_epf:
 	kfree(epf);