linux-kernel - Re: [PATCH] staging: slicoss: remove unused variables

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Date:	Fri, 11 Sep 2015 19:51:38 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	devel@...verdev.osuosl.org,
	Christopher Harrer <charrer@...critech.com>,
	Lior Dotan <liodot@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: slicoss: remove unused variables

On Thu, Sep 10, 2015 at 06:52:22PM +0530, Sudip Mukherjee wrote:
> On Wed, Sep 09, 2015 at 11:31:37AM -0700, Greg Kroah-Hartman wrote:
> > On Fri, Sep 04, 2015 at 06:53:18PM +0530, Sudip Mukherjee wrote:
> > > These variables were only assigned some values but they were never used.
> > > 
> > > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> > > ---
> > >  drivers/staging/slicoss/slicoss.c | 27 ++++++---------------------
> > >  1 file changed, 6 insertions(+), 21 deletions(-)
> > > 
> > > diff --git a/drivers/staging/slicoss/slicoss.c b/drivers/staging/slicoss/slicoss.c
> > > index 8585970..1536ca0 100644
> > > --- a/drivers/staging/slicoss/slicoss.c
> > > +++ b/drivers/staging/slicoss/slicoss.c
> <snip>
> > > @@ -1730,15 +1727,13 @@ static void slic_link_event_handler(struct adapter *adapter)
> > >  	pshmem = (struct slic_shmem *)(unsigned long)adapter->phys_shmem;
> > >  
> > >  #if BITS_PER_LONG == 64
> > > -	status = slic_upr_request(adapter,
> > > -				  SLIC_UPR_RLSR,
> > > -				  SLIC_GET_ADDR_LOW(&pshmem->linkstatus),
> > > -				  SLIC_GET_ADDR_HIGH(&pshmem->linkstatus),
> > > -				  0, 0);
> > > +	slic_upr_request(adapter, SLIC_UPR_RLSR,
> > > +			 SLIC_GET_ADDR_LOW(&pshmem->linkstatus),
> > > +			 SLIC_GET_ADDR_HIGH(&pshmem->linkstatus), 0, 0);
> > >  #else
> > > -	status = slic_upr_request(adapter, SLIC_UPR_RLSR,
> > > -		(u32) &pshmem->linkstatus,	/* no 4GB wrap guaranteed */
> > > -				  0, 0, 0);
> > > +	slic_upr_request(adapter, SLIC_UPR_RLSR,
> > > +			 (u32)&pshmem->linkstatus, /* no 4GB wrap guaranteed */
> > > +			 0, 0, 0);
> > 
> > Shouldn't we do something with status instead of just ignoring it?
> I can think of 3 possibilities.
> 1) Ignore it as this is writing READ_LINK_STATUS command to the device
> asynchronously, and then writing UP configuration command. So if status
> is error here then the device will not be UP.
> 
> 2) loop here with a delay until the call succeeds. (will be a very bad
> design, but there are some codes doing that). But this functions is also
> called from an ISR so we should not be doing that.
> 
> 3) return the error code and do the error handling properly by clearing
> and releasing all resources acquired by the function which called it.
> 
> Which one will you suggest? I am sure you will say : 3.  :)

I don't know why you even had to ask, of course 3 is the correct thing
:)


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