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Date:   Fri, 27 Apr 2018 15:59:08 +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>
Subject: [PATCH 4.16 66/81] block/swim: Check drive type

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

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

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

commit 8a500df63d07d8aee44b7ee2c54e462e47ce93ec upstream.

The SWIM chip is compatible with GCR-mode Sony 400K/800K drives but
this driver only supports MFM mode. Therefore only Sony FDHD drives
are supported. Skip incompatible drives.

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>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/swim.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -834,10 +834,12 @@ static int swim_floppy_init(struct swim_
 	/* scan floppy drives */
 
 	swim_drive(base, INTERNAL_DRIVE);
-	if (swim_readbit(base, DRIVE_PRESENT))
+	if (swim_readbit(base, DRIVE_PRESENT) &&
+	    !swim_readbit(base, ONEMEG_DRIVE))
 		swim_add_floppy(swd, INTERNAL_DRIVE);
 	swim_drive(base, EXTERNAL_DRIVE);
-	if (swim_readbit(base, DRIVE_PRESENT))
+	if (swim_readbit(base, DRIVE_PRESENT) &&
+	    !swim_readbit(base, ONEMEG_DRIVE))
 		swim_add_floppy(swd, EXTERNAL_DRIVE);
 
 	/* register floppy drives */


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