5.15-stable review patch. If anyone has any objections, please let me know.
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From: KhaiWenTan khai.wen.tan@linux.intel.com
commit 675faf5a14c14a2be0b870db30a70764df81e2df upstream.
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 Reviewed-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/20240918061422.1589662-1-khai.wen.tan@linux.intel.c... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c @@ -394,6 +394,7 @@ static int tc_setup_cbs(struct stmmac_pr return ret;
priv->plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB; + return 0; }
/* Final adjustments for HW */