netdev - Re: [PATCH] net: usb: lan78xx: Use phy_mac_interrupt() for interrupt handling

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Date:   Fri, 18 Oct 2019 15:15:32 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Daniel Wagner <dwagner@...e.de>
Cc:     UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        Marc Zyngier <maz@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Stefan Wahren <wahrenst@....net>,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] net: usb: lan78xx: Use phy_mac_interrupt() for interrupt
 handling

On 2019-10-18 10:28:17 [+0200], Daniel Wagner wrote:
> handle_simple_irq() expect interrupts to be disabled. The USB
> framework is using threaded interrupts, which implies that interrupts
> are re-enabled as soon as it has run.

Without threading interrupts, this is invoked in pure softirq context
since commit ed194d1367698 ("usb: core: remove local_irq_save() around
->complete() handler") where the local_irq_disable() has been removed.

This is probably not a problem because the lock is never observed with
in IRQ context.

Wouldn't handle_nested_irq() work here instead of the simple thingy?

Sebastian