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Date: Mon, 25 Apr 2022 00:17:21 +0200 From: Andrew Lunn <andrew@...n.ch> To: "Maciej W. Rozycki" <macro@...am.me.uk> Cc: Wan Jiabing <wanjiabing@...o.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, kael_w@...h.net Subject: Re: [PATCH] FDDI: defxx: simplify if-if to if-else On Sun, Apr 24, 2022 at 11:39:50AM +0100, Maciej W. Rozycki wrote: > On Sun, 24 Apr 2022, Wan Jiabing wrote: > > > diff --git a/drivers/net/fddi/defxx.c b/drivers/net/fddi/defxx.c > > index b584ffe38ad6..3edb2e96f763 100644 > > --- a/drivers/net/fddi/defxx.c > > +++ b/drivers/net/fddi/defxx.c > > @@ -585,10 +585,10 @@ static int dfx_register(struct device *bdev) > > bp->mmio = false; > > dfx_get_bars(bp, bar_start, bar_len); > > } > > - } > > - if (!dfx_use_mmio) > > + } else { > > region = request_region(bar_start[0], bar_len[0], > > bdev->driver->name); > > + } > > NAK. The first conditional optionally sets `bp->mmio = false', which > changes the value of `dfx_use_mmio' in some configurations: > > #if defined(CONFIG_EISA) || defined(CONFIG_PCI) > #define dfx_use_mmio bp->mmio > #else > #define dfx_use_mmio true > #endif Which is just asking for trouble like this. Could i suggest dfx_use_mmio is changed to DFX_USE_MMIO to give a hint something horrible is going on. It probably won't stop the robots finding this if (x) if (!x), but there is a chance the robot drivers will wonder why it is upper case. Andrew
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