linux-kernel - [PATCH 08/12] block/swim: Don't log an error message for an invalid ioctl

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Date:   Sat, 31 Mar 2018 21:41:05 -0400 (EDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Laurent Vivier <lvivier@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: [PATCH 08/12] block/swim: Don't log an error message for an invalid
 ioctl

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>
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 drivers/block/swim.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index 19d7d27468c7..8be0d92bc431 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -739,14 +739,9 @@ static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 		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)
-- 
2.16.1