linux-kernel - [PATCH 4.16 67/81] block/swim: Dont log an error message for an invalid ioctl

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Date:   Fri, 27 Apr 2018 15:59:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Laurent Vivier <lvivier@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, Stan Johnson <userm57@...oo.com>,
        Finn Thain <fthain@...egraphics.com.au>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 4.16 67/81] block/swim: Dont log an error message for an invalid ioctl

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

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

From: Finn Thain <fthain@...egraphics.com.au>

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@...hat.com>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: stable@...r.kernel.org # v4.14+
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
Acked-by: Laurent Vivier <lvivier@...hat.com>
Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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)