usb: gadget: f_mass_storage: remove unnecessary open check

The fsg_lun_is_open() test can be eliminated and the code merged with
the preceding conditional, because the LUN won't be open if
cfg->filename wasn't set. Similarly, the error_lun label will never be
reached with an open lun (non-null filp) so remove the unnecessary
fsg_lun_close() call.
Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Message-ID: <20230607215401.22563-1-ddiss@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/function/f_mass_storage.c

@@ -2857,7 +2857,7 @@ int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
 			  const char **name_pfx)
 {
 	struct fsg_lun *lun;
-	char *pathbuf, *p;
+	char *pathbuf = NULL, *p = "(no medium)";
 	int rc = -ENOMEM;
 
 	if (id >= ARRAY_SIZE(common->luns))
@@ -2907,12 +2907,9 @@ int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
 		rc = fsg_lun_open(lun, cfg->filename);
 		if (rc)
 			goto error_lun;
-	}
 
-	pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
-	p = "(no medium)";
-	if (fsg_lun_is_open(lun)) {
 		p = "(error)";
+		pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
 		if (pathbuf) {
 			p = file_path(lun->filp, pathbuf, PATH_MAX);
 			if (IS_ERR(p))
@@ -2931,7 +2928,6 @@ int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
 error_lun:
 	if (device_is_registered(&lun->dev))
 		device_unregister(&lun->dev);
-	fsg_lun_close(lun);
 	common->luns[id] = NULL;
 error_sysfs:
 	kfree(lun);