| Message ID | 20240918061422.1589662-1-khai.wen.tan@linux.intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [net,v2,1/1] net: stmmac: Fix zero-division error when disabling tc cbs | expand |
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@vger.kernel.org> > Co-developed-by: Choong Yong Liang <yong.liang.choong@linux.intel.com> > Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com> > Signed-off-by: KhaiWenTan <khai.wen.tan@linux.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@kernel.org>
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c index 832998bc020b..75ad2da1a37f 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c @@ -386,6 +386,7 @@ static int tc_setup_cbs(struct stmmac_priv *priv, return ret; priv->plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB; + return 0; } /* Final adjustments for HW */
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@vger.kernel.org> Co-developed-by: Choong Yong Liang <yong.liang.choong@linux.intel.com> Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com> Signed-off-by: KhaiWenTan <khai.wen.tan@linux.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/ --- drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 1 + 1 file changed, 1 insertion(+)