linux-kernel - RE: [PATCH V1 7/7] Drivers: scsi: storvsc: Increase the value of STORVSC_MAX_IO

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Message-ID: <fe60584bb8f2485abebffab2d0e8722d@SN2PR03MB061.namprd03.prod.outlook.com>
Date:	Thu, 16 May 2013 14:01:12 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH V1 7/7] Drivers: scsi: storvsc: Increase the value of
 STORVSC_MAX_IO_REQUESTS



> -----Original Message-----
> From: Dan Carpenter [mailto:dan.carpenter@...cle.com]
> Sent: Thursday, May 16, 2013 9:55 AM
> To: KY Srinivasan
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; ohering@...e.com; jbottomley@...allels.com;
> hch@...radead.org; linux-scsi@...r.kernel.org; apw@...onical.com;
> jasowang@...hat.com
> Subject: Re: [PATCH V1 7/7] Drivers: scsi: storvsc: Increase the value of
> STORVSC_MAX_IO_REQUESTS
> 
> On Thu, May 16, 2013 at 01:37:41PM +0000, KY Srinivasan wrote:
> >
> >
> > > -----Original Message-----
> > > From: Dan Carpenter [mailto:dan.carpenter@...cle.com]
> > > Sent: Thursday, May 16, 2013 8:02 AM
> > > To: KY Srinivasan
> > > Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> > > devel@...uxdriverproject.org; ohering@...e.com;
> jbottomley@...allels.com;
> > > hch@...radead.org; linux-scsi@...r.kernel.org; apw@...onical.com;
> > > jasowang@...hat.com
> > > Subject: Re: [PATCH V1 7/7] Drivers: scsi: storvsc: Increase the value of
> > > STORVSC_MAX_IO_REQUESTS
> > >
> > > On Thu, May 16, 2013 at 05:21:19AM -0700, K. Y. Srinivasan wrote:
> > > > Increase the value of STORVSC_MAX_IO_REQUESTS to 200 requests. The
> > > current
> > > > ringbuffer size can support this higher value.
> > > >
> > >
> > > The ringbuffer size is a module parameter so it's odd to talk about
> > > the "current" size.
> >
> > While the ringbuffer size is a module parameter; there is a default value. The
> current size refers to the default.
> > Your comment applies to the current value (of 128) as well in that it is possible
> for somebody to load this
> > driver  with a ringbuffer size that could not support  the value of 128. If this  is
> the case, we fail the load.
> > This safety check continues to exist.
> 
> The issue is there in the original code, true.
> 
> Would the right fix be to add some sanity checks in module_init()?

The check is already there (as I noted above). Look at the function:
storvsc_drv_init(). If the ring size is picked incorrectly, the load is failed.

Regards,

K. Y
> 
> regards,
> dan carpenter
> 
> 


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