From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>,
andrianov <andrianov@ispras.ru>,
mchehab@kernel.org, tony.luck@intel.com, james.morse@arm.com,
rrichter@marvell.com, linux-edac@vger.kernel.org
Subject: Re: Regarding bug in drivers/edac/x38_edac.c
Date: Sun, 16 Aug 2020 14:12:13 +0530 [thread overview]
Message-ID: <20200816084213.GA15146@madhuparna-HP-Notebook> (raw)
In-Reply-To: <20200816070621.GB21914@zn.tnic>
On Sun, Aug 16, 2020 at 09:06:21AM +0200, Borislav Petkov wrote:
> On Sun, Aug 16, 2020 at 12:05:57PM +0530, Madhuparna Bhowmik wrote:
> > 2. Even if we ignore the 1st point above and probe is called after init
> > finishes,
>
> AFAIR and if you don't have any async probing (which I don't believe for
> this driver or for any other EDAC driver), the ->probe() function gets
> called during pci_register_driver(). From the docs:
>
> Documentation/PCI/pci.rst:
>
> "pci_register_driver() call
> ==========================
>
> ...
>
> Once added, the driver probe routine will be invoked for any unclaimed
> PCI devices listed in its (newly updated) pci_ids list."
>
> You could verify that by adding some debugging printks to a driver's
> probe function.
>
> I believe it ends up somewhere in the driver core, looks like in
>
> really_probe():
>
> if (dev->bus->probe) {
> ret = dev->bus->probe(dev);
>
> in drivers/base/dd.c but I could be mistaken.
>
> > In general, calling the probe function from init itself is a bit strange.
>
> Yes, that is ugly - the init function tries what the probe function has
> already tried, again.
>
> But I don't think either 1. or 2. of yours happens - it is actually
> clumsy but the mci_pdev is simply a check to verify whether the
> ->probe() succeeded and try it again.
>
Thanks a lot for clarifying this.
> Now, if you have that hardware, you could verify all that but I think
> the reality is, I don't think anyone uses that hardware anymore and we
> will remove them at some point in the future so you might wanna look at
> some other drivers which *actually* are still in use.
>
Alright, makes sense.
Regards,
Madhuparna
> :-)
>
> HTH.
>
> --
> Regards/Gruss,
> Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette
prev parent reply other threads:[~2020-08-16 8:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAD=jOEZ9t4ztYtPKL9B1KA9=f4mniu6-bF_1-JWoPKJTE0kiaw@mail.gmail.com>
2020-08-16 7:06 ` Regarding bug in drivers/edac/x38_edac.c Borislav Petkov
2020-08-16 8:42 ` Madhuparna Bhowmik [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200816084213.GA15146@madhuparna-HP-Notebook \
--to=madhuparnabhowmik10@gmail.com \
--cc=andrianov@ispras.ru \
--cc=bp@alien8.de \
--cc=james.morse@arm.com \
--cc=linux-edac@vger.kernel.org \
--cc=mchehab@kernel.org \
--cc=rrichter@marvell.com \
--cc=tony.luck@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).