linux-kernel - Re: [PATCH 2/4 net] qca_spi: Fix SPI IRQ handling

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Message-ID: <a24433f86e39cbb45a9606621e01446e7ad6fa53.camel@redhat.com>
Date:   Thu, 23 Nov 2023 12:37:21 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Stefan Wahren <wahrenst@....net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Lino Sanfilippo <LinoSanfilippo@....de>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4 net] qca_spi: Fix SPI IRQ handling

On Tue, 2023-11-21 at 17:30 +0100, Stefan Wahren wrote:
> The functions qcaspi_netdev_open/close are responsible of request &
> free of the SPI interrupt, which wasn't the best choice. Currently
> it's possible to trigger a double free of the interrupt by calling
> qcaspi_netdev_close() after qcaspi_netdev_open() has failed.
> So let us split IRQ allocation & enabling, so we can take advantage
> of a device managed IRQ and also fix the issue.
> 
> Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
> Signed-off-by: Stefan Wahren <wahrenst@....net>

The change makes sense, but the changelog is confusing. 

qcaspi_netdev_close() and qcaspi_netdev_open() are invoked only via
ndo_open and ndo_close(), right? So qcaspi_netdev_close() will never be
invoked qcaspi_netdev_open(), failure - that is when IFF_UP is not set.

Cheers,

Paolo