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

[Simon Horman]

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>

...

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be sure to wait until 24h after the original patch was posted.

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