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net: stmmac: dwc-qos: Disable split header for Tegra194

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There is a long-standing issue with the Synopsys DWC Ethernet driver
for Tegra194 where random system crashes have been observed [0]. The
problem occurs when the split header feature is enabled in the stmmac
driver. In the bad case, a larger than expected buffer length is
received and causes the calculation of the total buffer length to
overflow. This results in a very large buffer length that causes the
kernel to crash. Why this larger buffer length is received is not clear,
however, the feedback from the NVIDIA design team is that the split
header feature is not supported for Tegra194. Therefore, disable split
header support for Tegra194 to prevent these random crashes from
occurring.

[0] https://lore.kernel.org/linux-tegra/b0b17697-f23e-8fa5-3757-604a86f3a095@nvidia.com/

Fixes: 67afd6d1cf ("net: stmmac: Add Split Header support and enable it in XGMAC cores")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20220706083913.13750-1-jonathanh@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jon Hunter 2022-07-06 09:39:13 +01:00 committed by Jakub Kicinski
parent ef4ab3ba4e
commit 029c1c2059
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
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@ -361,6 +361,7 @@ static int tegra_eqos_probe(struct platform_device *pdev,
data->fix_mac_speed = tegra_eqos_fix_speed;
data->init = tegra_eqos_init;
data->bsp_priv = eqos;
data->sph_disable = 1;
err = tegra_eqos_init(pdev, eqos);
if (err < 0)