linux-kernel - Re: [PATCH v4 3/4] PCI: pciehp: Add macros for hotplug operation delays

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Message-ID: <aQjlOHJoj-Fkkk4b@wunner.de>
Date: Mon, 3 Nov 2025 18:24:08 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Hans Zhang <18255117159@....com>, bhelgaas@...gle.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/4] PCI: pciehp: Add macros for hotplug operation
 delays

On Mon, Nov 03, 2025 at 09:37:34AM -0600, Bjorn Helgaas wrote:
> On Sun, Nov 02, 2025 at 12:05:37AM +0800, Hans Zhang wrote:
> > Add WAIT_PDS_TIMEOUT_MS and POLL_CMD_TIMEOUT_MS macros for hotplug
> > operation delays to improve code readability.
[...]
> > +++ b/drivers/pci/hotplug/pciehp_hpc.c
> > @@ -28,6 +28,9 @@
> >  #include "../pci.h"
> >  #include "pciehp.h"
> >  
> > +#define WAIT_PDS_TIMEOUT_MS	10
> > +#define POLL_CMD_TIMEOUT_MS	10
> > +
> >  static const struct dmi_system_id inband_presence_disabled_dmi_table[] = {
> >  	/*
> >  	 * Match all Dell systems, as some Dell systems have inband
> > @@ -103,7 +106,7 @@ static int pcie_poll_cmd(struct controller *ctrl, int timeout)
> >  			smp_mb();
> >  			return 1;
> >  		}
> > -		msleep(10);
> > +		msleep(POLL_CMD_TIMEOUT_MS);
> 
> Lukas might have different opinions and I would defer to him here.
> 
> But IMO (a) these aren't timeouts, they are poll intervals, (b) the
> values are arbitrary with no connection to a spec, so less reason for
> a #define, and (c) the #defines don't improve readability because now
> I have to look at two places to understand the poll loops.

I agree on all counts.

Thanks,

Lukas