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net: stmmac: Fix zero-division error when disabling tc cbs

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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.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
KhaiWenTan 2024-09-18 14:14:22 +08:00 committed by Greg Kroah-Hartman
parent 68e579316c
commit e33fe25b1e
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
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@ -363,6 +363,7 @@ 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 */