linux-kernel - Re: [RFC 13/19] staging: qlge: rewrite do while loop as for loop in qlge_sem

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Date:   Wed, 30 Jun 2021 21:35:31 -0700
From:   Joe Perches <joe@...ches.com>
To:     Coiby Xu <coiby.xu@...il.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        linux-staging@...ts.linux.dev, netdev@...r.kernel.org,
        Benjamin Poirier <benjamin.poirier@...il.com>,
        Shung-Hsi Yu <shung-hsi.yu@...e.com>,
        Manish Chopra <manishc@...vell.com>,
        "supporter:QLOGIC QLGE 10Gb ETHERNET DRIVER" 
        <GR-Linux-NIC-Dev@...vell.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 13/19] staging: qlge: rewrite do while loop as for loop in
 qlge_sem_spinlock

On Thu, 2021-07-01 at 07:33 +0800, Coiby Xu wrote:
> On Wed, Jun 30, 2021 at 03:58:06AM -0700, Joe Perches wrote:
> > On Thu, 2021-06-24 at 19:22 +0800, Coiby Xu wrote:
> > > On Tue, Jun 22, 2021 at 10:20:36AM +0300, Dan Carpenter wrote:
> > > > On Mon, Jun 21, 2021 at 09:48:56PM +0800, Coiby Xu wrote:
> > > > > Since wait_count=30 > 0, the for loop is equivalent to do while
> > > > > loop. This commit also replaces 100 with UDELAY_DELAY.
> > []
> > > > > diff --git a/drivers/staging/qlge/qlge_main.c b/drivers/staging/qlge/qlge_main.c
> > []
> > I also think using UDELAY_DELAY is silly and essentially misleading
> > as it's also used as an argument value for mdelay
> > 
> > $ git grep -w UDELAY_DELAY
> > drivers/staging/qlge/qlge.h:#define UDELAY_DELAY 100
> > drivers/staging/qlge/qlge_main.c:               udelay(UDELAY_DELAY);
> > drivers/staging/qlge/qlge_main.c:               udelay(UDELAY_DELAY);
> > drivers/staging/qlge/qlge_mpi.c:                mdelay(UDELAY_DELAY);
> > drivers/staging/qlge/qlge_mpi.c:                mdelay(UDELAY_DELAY);
> > drivers/staging/qlge/qlge_mpi.c:                mdelay(UDELAY_DELAY); /* 100ms */
> 
> Thanks for spotting this issue! How about "#define MDELAY_DELAY 100" for
> mdelay?

I think the define is pointless and it'd be more readable
to just use 100 in all the cases.

IMO: There really aren't enough cases to justify using defines.