linux-kernel - Re: Can a driver->probe be called for two devices at the same time (WAS: Re: [PATCH] crypto/ccp: don't disable interrupts while setting up debugfs)

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Date:   Tue, 27 Feb 2018 19:40:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Gary R Hook <gary.hook@....com>, "Hook, Gary" <ghook@....com>,
        linux-crypto@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-kernel@...r.kernel.org
Subject: Re: Can a driver->probe be called for two devices at the same time
 (WAS: Re: [PATCH] crypto/ccp: don't disable interrupts while setting up
 debugfs)

On Tue, Feb 27, 2018 at 06:33:14PM +0100, Sebastian Andrzej Siewior wrote:
> On 2018-02-27 11:08:56 [-0600], Gary R Hook wrote:
> > That issue remains unclear to me: Are probes of PCI devices guaranteed to be
> > serialized? Observations on my CCPs says that they occur in order, but I
> > don't know for certain that serialization is guaranteed.
> > 
> > Is there a definitive statement on this somewhere that I just don't know
> > about?

The bus enforces this.

> So the question if a driver can probe two devices simultaneously.

Depends on the bus type.

thanks,

greg k-h