linux-kernel - Re: [PATCH v2 2/2] module: Merge same-name module load requests

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Message-ID: <Y30N06kggeZKT8VD@bombadil.infradead.org>
Date:   Tue, 22 Nov 2022 09:58:43 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Petr Pavlu <petr.pavlu@...e.com>
Cc:     Prarit Bhargava <prarit@...hat.com>, pmladek@...e.com,
        linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v2 2/2] module: Merge same-name module load requests

On Tue, Nov 22, 2022 at 02:59:18PM +0100, Petr Pavlu wrote:
> On 11/21/22 20:03, Luis Chamberlain wrote:
> > To be clear I don't care about the patch mentioned in the above URL, I care
> > about this:
> > 
> > https://lkml.kernel.org/r/d0bc50e3-0e42-311b-20ed-7538bb918c5b@suse.com
> > [...]
> > 
> > Petr, you had mentioned in the commit log for your second patch in this
> > thread that your change fixes a regression. What I asked for was for a
> > patch that fixes that regression alone first so we can send to stable.
> > So what issue is that alternative patch fixing?
> 
> This alternative patch fixes the discussed regression with failing inserts of
> acpi_cpufreq and pcc_cpufreq delaying boot. As mentioned, the situation can in
> the worst case prevent udev from loading drivers for other devices and might
> cause timeouts of services waiting on them and subsequently a failed boot.
> 
> The patch attempts a different solution for the problem that 6e6de3dee51a was
> trying to solve. Rather than waiting for the unloading to complete, it returns
> a different error code (-EBUSY) for modules in the GOING state. This should
> avoid the error situation that was described in 6e6de3dee51a (user space
> attempting to load a dependent module because the -EEXIST error code would
> suggest to user space that the first module had been loaded successfully),
> while avoiding the delay issue too.

Great, can you send a proper patch now with a proper commit log and Cc
stable tag?

  Luis