netdev - Re: [PATCH V3 2/6] net: stmmac: stop each tx channel independently

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 26 Jan 2021 18:09:33 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        linux-imx@....com, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH V3 2/6] net: stmmac: stop each tx channel independently

On Tue, Jan 26, 2021 at 7:03 AM Joakim Zhang <qiangqing.zhang@....com> wrote:
>
> If clear GMAC_CONFIG_TE bit, it would stop all tx channels, but users
> may only want to stop secific tx channel.

secific -> specific

>
> Fixes: 48863ce5940f ("stmmac: add DMA support for GMAC 4.xx")
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
> index 0b4ee2dbb691..71e50751ef2d 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
> @@ -53,10 +53,6 @@ void dwmac4_dma_stop_tx(void __iomem *ioaddr, u32 chan)
>
>         value &= ~DMA_CONTROL_ST;
>         writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));
> -
> -       value = readl(ioaddr + GMAC_CONFIG);
> -       value &= ~GMAC_CONFIG_TE;
> -       writel(value, ioaddr + GMAC_CONFIG);

Is it safe to partially unwind the actions of dwmac4_dma_start_tx

And would the same reasoning apply to dwmac4_(dma_start|stop)_rx?