linux-kernel - Re: [PATCH 1/4] platform/x86: simatic-ipc: add main driver for Siemens devices

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Date:   Fri, 5 Mar 2021 18:47:05 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Henning Schild <henning.schild@...mens.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-watchdog@...r.kernel.org,
        Srikanth Krishnakar <skrishnakar@...il.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Gerd Haeussler <gerd.haeussler.ext@...mens.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 1/4] platform/x86: simatic-ipc: add main driver for
 Siemens devices

On Fri, Mar 5, 2021 at 6:41 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Fri, Mar 5, 2021 at 6:25 PM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Fri, Mar 5, 2021 at 6:14 PM Hans de Goede <hdegoede@...hat.com> wrote:
> > > On 3/5/21 4:42 PM, Andy Shevchenko wrote:
>
> ...
>
> > > So I took a quick look at the following 2 commits:
> >
> > (One of the latter commits moves the code to drivers/pci/pci-p2sb.c,
> > do you think it's better like that? The idea is to deduplicate
> > __pci_bus_read_base() call)
> >
> > > "platform/x86: p2sb: New Primary to Sideband bridge support library"
> > > "mfd: lpc_ich: Switch to generic p2sb_bar()"
> > >
> > > And this looks good to me, although compared to the code from this
> > > patch-set you are missing the pci_lock_rescan_remove(); and
> > > pci_unlock_rescan_remove(); calls.
> >
> > Oh, indeed.
>
> Correction here, I'm using pci_bus_sem in the latest version.

Okay, it seems that semaphore is not what I need and PCI rescan lock
is what is mandatory to take here.


-- 
With Best Regards,
Andy Shevchenko