Re: [PATCH net v2] net: usb: lan78xx: fix error handling in lan78xx_open()

[Andrew Lunn]

On Tue, Oct 20, 2026 at 10:26:14PM +0200, Stefano Munari wrote:
> A failed interrupt URB submission leaves NAPI enabled and EVENT_DEV_OPEN
> set. A subsequent open enables NAPI again, triggering BUG_ON() in
> napi_enable().
> 
> Clear EVENT_DEV_OPEN and disable NAPI on the submission error path.
> 
> Reproduced using failslab on a Raspberry Pi 3 Model B+ (LAN7515).
> With the fix, the injected allocation failure returns -ENOMEM and a
> subsequent open succeeds. Verified connectivity with ping and SSH.

Memory allocations for small blocks generally don't fail, so this is
theoretical, and very unlikely to happen. Please target net-next, and
drop the Fixes tag.

    Andrew

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