netdev - Re: [PATCH 2/3] net: stmmac: Always use the number of configured TX queues

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Date:   Tue, 28 Mar 2017 16:10:43 +0200
From:   Niklas Cassel <niklas.cassel@...s.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     Joao Pinto <Joao.Pinto@...opsys.com>,
        David Miller <davem@...emloft.net>,
        <clabbe.montjoie@...il.com>, <peppe.cavallaro@...com>,
        <alexandre.torgue@...com>, <sergei.shtylyov@...entembedded.com>,
        <f.fainelli@...il.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/3] net: stmmac: Always use the number of configured TX
 queues



On 03/28/2017 03:57 PM, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> Even if hardware supports multiple queues, software can choose to only
> use a subset of them. Make sure we never try to access uninitialized
> queues.
> 
> Signed-off-by: Thierry Reding <treding@...dia.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 106ace3781b3..ec5bba85c529 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -3423,7 +3423,7 @@ static int stmmac_poll(struct napi_struct *napi, int budget)
>  	struct stmmac_rx_queue *rx_q =
>  		container_of(napi, struct stmmac_rx_queue, napi);
>  	struct stmmac_priv *priv = rx_q->priv_data;
> -	u32 tx_count = priv->dma_cap.number_tx_queues;
> +	u32 tx_count = priv->plat->tx_queues_to_use;
>  	u32 chan = rx_q->queue_index;
>  	u32 work_done = 0;
>  	u32 queue = 0;
> 

Thanks Thierry,
but this look like an equivalent patch to Joao's
"net: stmmac: fix number of tx queues in stmmac_poll"
which I already used during bisecting to avoid random
crashes in stmmac_tx_clean.

Have you noticed random RX brokenness after boot in
recent linux-next tags?

It feels like it might trigger more often after a
cold boot, but that could just be my brain seeing
patterns that aren't really there :)