[PATCH 4.14 70/80] block/swim: Dont log an error message for an invalid ioctl

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>

commit 8e2ab5a4efaac77fb93e5b5b109d0b3976fdd3a0 upstream.

The 'eject' shell command may send various different ioctl commands.
This leads to error messages on the console even though the FDEJECT
ioctl succeeds.

~# eject floppy
SWIM floppy_ioctl: unknown cmd 21257
SWIM floppy_ioctl: unknown cmd 1

Don't log an error message for an invalid ioctl, just do as the
swim3 driver does and return -ENOTTY.

Cc: Laurent Vivier <lvivier@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.14+
Tested-by: Stan Johnson <userm57@xxxxxxxxx>
Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
Acked-by: Laurent Vivier <lvivier@xxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/block/swim.c |    9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -727,14 +727,9 @@ static int floppy_ioctl(struct block_dev
 		if (copy_to_user((void __user *) param, (void *) &floppy_type,
 				 sizeof(struct floppy_struct)))
 			return -EFAULT;
-		break;
-
-	default:
-		printk(KERN_DEBUG "SWIM floppy_ioctl: unknown cmd %d\n",
-		       cmd);
-		return -ENOSYS;
+		return 0;
 	}
-	return 0;
+	return -ENOTTY;
 }
 
 static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)