linux-kernel - Re: [PATCH v1 7/7] s390/block/dasd: remove obsolete while -EBUSY loop

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Date:	Wed, 8 Apr 2015 14:00:56 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	Sebastian Ott <sebott@...ux.vnet.ibm.com>
Cc:	Ming Lei <ming.lei@...onical.com>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	David Herrmann <dh.herrmann@...il.com>,
	Markus Pargmann <mpa@...gutronix.de>,
	nbd-general@...ts.sourceforge.net,
	Stefan Haberland <stefan.haberland@...ibm.com>,
	Fabian Frederick <fabf@...net.be>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-s390@...r.kernel.org, Stefan Weinhuber <wein@...ibm.com>
Subject: Re: [PATCH v1 7/7] s390/block/dasd: remove obsolete while -EBUSY loop

On Wed, Apr 08, 2015 at 07:32:24PM +0200, Sebastian Ott wrote:
> On Wed, 8 Apr 2015, Ming Lei wrote:
> > From: Jarod Wilson <jarod@...hat.com>
> > 
> > With the mutex_trylock bit gone from blkdev_reread_part(), the retry logic
> > in dasd_scan_partitions() shouldn't be necessary.
> > 
> > CC: Christoph Hellwig <hch@...radead.org>
> > CC: Jens Axboe <axboe@...nel.dk>
> > CC: Tejun Heo <tj@...nel.org>
> > CC: Alexander Viro <viro@...iv.linux.org.uk>
> > CC: Markus Pargmann <mpa@...gutronix.de>
> > CC: Stefan Weinhuber <wein@...ibm.com>
> > CC: Stefan Haberland <stefan.haberland@...ibm.com>
> > CC: Sebastian Ott <sebott@...ux.vnet.ibm.com>
> > CC: Fabian Frederick <fabf@...net.be>
> > CC: Ming Lei <ming.lei@...onical.com>
> > CC: David Herrmann <dh.herrmann@...il.com>
> > CC: Andrew Morton <akpm@...ux-foundation.org>
> > CC: Peter Zijlstra <peterz@...radead.org>
> > CC: nbd-general@...ts.sourceforge.net
> > CC: linux-s390@...r.kernel.org
> > Signed-off-by: Jarod Wilson <jarod@...hat.com>
> > ---
> >  drivers/s390/block/dasd_genhd.c |   13 +++----------
> >  1 file changed, 3 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
> > index 2af4619..189ea2f 100644
> > --- a/drivers/s390/block/dasd_genhd.c
> > +++ b/drivers/s390/block/dasd_genhd.c
> > @@ -99,9 +99,8 @@ void dasd_gendisk_free(struct dasd_block *block)
> >  int dasd_scan_partitions(struct dasd_block *block)
> >  {
> >  	struct block_device *bdev;
> > -	int retry, rc;
> > +	int rc;
> > 
> > -	retry = 5;
> >  	bdev = bdget_disk(block->gdp, 0);
> >  	if (!bdev) {
> >  		DBF_DEV_EVENT(DBF_ERR, block->base, "%s",
> > @@ -118,14 +117,8 @@ int dasd_scan_partitions(struct dasd_block *block)
> >  	}
> > 
> >  	rc = blkdev_reread_part(bdev);
> > -	while (rc == -EBUSY && retry > 0) {
> > -		schedule();
> > -		rc = blkdev_reread_part(bdev);
> > -		retry--;
> > -		DBF_DEV_EVENT(DBF_ERR, block->base,
> > -			      "scan partitions error, retry %d rc %d",
> > -			      retry, rc);
> > -	}
> > +	DBF_DEV_EVENT(DBF_ERR, block->base,
> > +		      "scan partitions error, rc %d", rc);
> 
> Could you please change that to only write the debug message in the error
> case. Other than that, both dasd patches look good.

D'oh, absolutely. Ming, do you want me to send an updated patch 7 along in
reply here, or do you want to handle it and/or repost the entire set?

-- 
Jarod Wilson
jarod@...hat.com

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