linux-kernel - Re: [PATCH] scsi: storvsc: use shost_for_each

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Message-ID: <87wpwzefir.fsf@vitty.brq.redhat.com>
Date:	Thu, 13 Aug 2015 10:53:00 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	"James E.J. Bottomley" <JBottomley@...n.com>
Cc:	KY Srinivasan <kys@...rosoft.com>,
	"linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"devel\@linuxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Long Li <longli@...rosoft.com>
Subject: Re: [PATCH] scsi: storvsc: use shost_for_each_device() instead of open coding

Long Li <longli@...rosoft.com> writes:

>> -----Original Message-----
>> From: KY Srinivasan
>> Sent: Friday, July 03, 2015 11:35 AM
>> To: Vitaly Kuznetsov; linux-scsi@...r.kernel.org
>> Cc: Long Li; Haiyang Zhang; James E.J. Bottomley; devel@...uxdriverproject.org;
>> linux-kernel@...r.kernel.org
>> Subject: RE: [PATCH] scsi: storvsc: use shost_for_each_device() instead of open
>> coding
>> 
>> 
>> 
>> > -----Original Message-----
>> > From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]
>> > Sent: Wednesday, July 1, 2015 2:31 AM
>> > To: linux-scsi@...r.kernel.org
>> > Cc: Long Li; KY Srinivasan; Haiyang Zhang; James E.J. Bottomley;
>> > devel@...uxdriverproject.org; linux-kernel@...r.kernel.org
>> > Subject: [PATCH] scsi: storvsc: use shost_for_each_device() instead of
>> > open coding
>> >
>> > Comment in struct Scsi_Host says that drivers are not supposed to
>> > access __devices directly. storvsc_host_scan() doesn't happen in irq
>> > context so we can just use shost_for_each_device().
>> >
>> > Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
>> 
>> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Reviewed-by: Long Li <longli@...rosoft.com>

Sorry for the ping but it seems the fix never made it to scsi tree...

>> > ---
>> >  drivers/scsi/storvsc_drv.c | 9 +--------
>> >  1 file changed, 1 insertion(+), 8 deletions(-)
>> >
>> > diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
>> > index 3c6584f..9ea912b 100644
>> > --- a/drivers/scsi/storvsc_drv.c
>> > +++ b/drivers/scsi/storvsc_drv.c
>> > @@ -426,7 +426,6 @@ static void storvsc_host_scan(struct work_struct
>> > *work)
>> >  	struct storvsc_scan_work *wrk;
>> >  	struct Scsi_Host *host;
>> >  	struct scsi_device *sdev;
>> > -	unsigned long flags;
>> >
>> >  	wrk = container_of(work, struct storvsc_scan_work, work);
>> >  	host = wrk->host;
>> > @@ -443,14 +442,8 @@ static void storvsc_host_scan(struct work_struct
>> > *work)
>> >  	 * may have been removed this way.
>> >  	 */
>> >  	mutex_lock(&host->scan_mutex);
>> > -	spin_lock_irqsave(host->host_lock, flags);
>> > -	list_for_each_entry(sdev, &host->__devices, siblings) {
>> > -		spin_unlock_irqrestore(host->host_lock, flags);
>> > +	shost_for_each_device(sdev, host)
>> >  		scsi_test_unit_ready(sdev, 1, 1, NULL);
>> > -		spin_lock_irqsave(host->host_lock, flags);
>> > -		continue;
>> > -	}
>> > -	spin_unlock_irqrestore(host->host_lock, flags);
>> >  	mutex_unlock(&host->scan_mutex);
>> >  	/*
>> >  	 * Now scan the host to discover LUNs that may have been added.
>> > --
>> > 2.4.3

-- 
  Vitaly
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