linux-kernel - Re: [PATCH net] fbnic: Set napi irq value after calling netif_napi

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Message-ID: <26a35c93-5a59-4ca1-ba62-01258767b214@linux.dev>
Date: Thu, 12 Sep 2024 23:16:55 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Brett Creeley <brett.creeley@....com>, alexanderduyck@...com,
 kuba@...nel.org, kernel-team@...a.com, davem@...emloft.net,
 pabeni@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: jdamato@...tly.com, stable@...r.kernel.org
Subject: Re: [PATCH net] fbnic: Set napi irq value after calling
 netif_napi_add

On 12/09/2024 18:49, Brett Creeley wrote:
> The driver calls netif_napi_set_irq() and then calls netif_napi_add(),
> which calls netif_napi_add_weight(). At the end of
> netif_napi_add_weight() is a call to netif_napi_set_irq(napi, -1), which
> clears the previously set napi->irq value. Fix this by calling
> netif_napi_set_irq() after calling netif_napi_add().
> 
> This was found when reviewing another patch and I have no way to test
> this, but the fix seemed relatively straight forward.
> Cc: stable@...r.kernel.org
> Fixes: bc6107771bb4 ("eth: fbnic: Allocate a netdevice and napi vectors with queues")
> Signed-off-by: Brett Creeley <brett.creeley@....com>

I agree that irq vector is lost without this patch.

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>