[PATCH] dax: avoid -Wempty-body warnings

[PATCH] dax: avoid -Wempty-body warnings

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

gcc warns about an empty body in an else statement:

drivers/dax/bus.c: In function 'do_id_store':
drivers/dax/bus.c:94:48: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
   94 |                         /* nothing to remove */;
      |                                                ^
drivers/dax/bus.c:99:43: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
   99 |                 /* dax_id already added */;
      |                                           ^

In both of these cases, the 'else' exists only to have a place to
add a comment, but that comment doesn't really explain that much
either, so the easiest way to shut up that warning is to just
remove the else.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/dax/bus.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 452e85ae87a8..5aee26e1bbd6 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -90,13 +90,11 @@ static ssize_t do_id_store(struct device_driver *drv, const char *buf,
 				list_add(&dax_id->list, &dax_drv->ids);
 			} else
 				rc = -ENOMEM;
-		} else
-			/* nothing to remove */;
+		}
 	} else if (action == ID_REMOVE) {
 		list_del(&dax_id->list);
 		kfree(dax_id);
-	} else
-		/* dax_id already added */;
+	}
 	mutex_unlock(&dax_bus_lock);
 
 	if (rc < 0)
-- 
2.29.2

Re: [PATCH] dax: avoid -Wempty-body warnings

[Dan Williams]

On Mon, Mar 22, 2021 at 4:45 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> gcc warns about an empty body in an else statement:
>
> drivers/dax/bus.c: In function 'do_id_store':
> drivers/dax/bus.c:94:48: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
>    94 |                         /* nothing to remove */;
>       |                                                ^
> drivers/dax/bus.c:99:43: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
>    99 |                 /* dax_id already added */;
>       |                                           ^
>
> In both of these cases, the 'else' exists only to have a place to
> add a comment, but that comment doesn't really explain that much
> either, so the easiest way to shut up that warning is to just
> remove the else.

Ok, applied, thanks.