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

[Tan, Khai Wen]

On 12/9/2024 11:39 pm, Simon Horman wrote:
> On Thu, Sep 12, 2024 at 04:37:30PM +0100, Simon Horman wrote:
>> On Thu, Sep 12, 2024 at 09:55:41AM +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 at vger.kernel.org>
>>> Co-developed-by: Choong Yong Liang <yong.liang.choong at linux.intel.com>
>>> Signed-off-by: Choong Yong Liang <yong.liang.choong at linux.intel.com>
>>> Signed-off-by: KhaiWenTan <khai.wen.tan at linux.intel.com>
> ...
>
> One more thing, if you do post an updated patch, please
> be sure to wait until 24h after the original patch was posted.
>
> https://docs.kernel.org/process/maintainer-netdev.html

Hi Simon,

Thanks for the clarification. Will be updating a version 2 for this patch.