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Date:   Sat, 18 Apr 2020 11:44:09 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        linux-fsdevel@vger.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        linux-input@vger.kernel.org, Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org,
        "J. Bruce Fields" <bfields@fieldses.org>,
        Chuck Lever <chuck.lever@oracle.com>,
        linux-nfs@vger.kernel.org,
        Johannes Berg <johannes@sipsolutions.net>,
        Dan Williams <dan.j.williams@intel.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Dave Jiang <dave.jiang@intel.com>, linux-nvdimm@lists.01.org,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        linux-scsi@vger.kernel.org, target-devel@vger.kernel.org,
        Zzy Wysm <zzy@zzywysm.com>
Subject: Re: [PATCH 5/9] usb: fix empty-body warning in sysfs.c
Message-ID: <20200418184409.GP5820@bombadil.infradead.org>
References: <20200418184111.13401-1-rdunlap@infradead.org>
 <20200418184111.13401-6-rdunlap@infradead.org>
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On Sat, Apr 18, 2020 at 11:41:07AM -0700, Randy Dunlap wrote:
> +++ linux-next-20200327/drivers/usb/core/sysfs.c
> @@ -1263,7 +1263,7 @@ void usb_create_sysfs_intf_files(struct
>  	if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
>  		alt->string = usb_cache_string(udev, alt->desc.iInterface);
>  	if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
> -		;	/* We don't actually care if the function fails. */
> +		do_empty(); /* We don't actually care if the function fails. */
>  	intf->sysfs_files_created = 1;
>  }

Why not just?

+	if (alt->string)
+		device_create_file(&intf->dev, &dev_attr_interface);