netdev - Re: [PATCH net v2 1/1] net: stmmac: Fix zero-division error when disabling tc cbs

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Message-ID: <20240918070649.GR167971@kernel.org>
Date: Wed, 18 Sep 2024 08:06:49 +0100
From: Simon Horman <horms@...nel.org>
To: KhaiWenTan <khai.wen.tan@...ux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Xiaolei Wang <xiaolei.wang@...driver.com>, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Tan Khai Wen <khai.wen.tan@...el.com>
Subject: Re: [PATCH net v2 1/1] net: stmmac: Fix zero-division error when
 disabling tc cbs

On Wed, Sep 18, 2024 at 02:14:22PM +0800, KhaiWenTan wrote:
> The commit b8c43360f6e4 ("net: stmmac: No need to calculate speed divider
> when offload is disabled") allows the "port_transmit_rate_kbps" to be
> set to a value of 0, which is then passed to the "div_s64" function when
> tc-cbs is disabled. This leads to a zero-division error.
> 
> When tc-cbs is disabled, the idleslope, sendslope, and credit values the
> credit values are not required to be configured. Therefore, adding a return
> statement after setting the txQ mode to DCB when tc-cbs is disabled would
> prevent a zero-division error.
> 
> Fixes: b8c43360f6e4 ("net: stmmac: No need to calculate speed divider when offload is disabled")
> Cc: <stable@...r.kernel.org>
> Co-developed-by: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
> Signed-off-by: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
> Signed-off-by: KhaiWenTan <khai.wen.tan@...ux.intel.com>
> ---
> v2:
>   - reflected code for better understanding
> v1: https://patchwork.kernel.org/project/netdevbpf/patch/20240912015541.363600-1-khai.wen.tan@linux.intel.com/

Thanks for the update.

Reviewed-by: Simon Horman <horms@...nel.org>