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net: stmmac: enable all safety features by default

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[ Upstream commit fdfc76a116b5e9d3e98e6c96fe83b42d011d21d4 ]

In the original implementation of dwmac5
commit 8bf993a5877e ("net: stmmac: Add support for DWMAC5 and implement Safety Features")
all safety features were enabled by default.

Later it seems some implementations didn't have support for all the
features, so in
commit 5ac712dcdfef ("net: stmmac: enable platform specific safety features")
the safety_feat_cfg structure was added to the callback and defined for
some platforms to selectively enable these safety features.

The problem is that only certain platforms were given that software
support. If the automotive safety package bit is set in the hardware
features register the safety feature callback is called for the platform,
and for platforms that didn't get a safety_feat_cfg defined this results
in the following NULL pointer dereference:

[    7.933303] Call trace:
[    7.935812]  dwmac5_safety_feat_config+0x20/0x170 [stmmac]
[    7.941455]  __stmmac_open+0x16c/0x474 [stmmac]
[    7.946117]  stmmac_open+0x38/0x70 [stmmac]
[    7.950414]  __dev_open+0x100/0x1dc
[    7.954006]  __dev_change_flags+0x18c/0x204
[    7.958297]  dev_change_flags+0x24/0x6c
[    7.962237]  do_setlink+0x2b8/0xfa4
[    7.965827]  __rtnl_newlink+0x4ec/0x840
[    7.969766]  rtnl_newlink+0x50/0x80
[    7.973353]  rtnetlink_rcv_msg+0x12c/0x374
[    7.977557]  netlink_rcv_skb+0x5c/0x130
[    7.981500]  rtnetlink_rcv+0x18/0x2c
[    7.985172]  netlink_unicast+0x2e8/0x340
[    7.989197]  netlink_sendmsg+0x1a8/0x420
[    7.993222]  ____sys_sendmsg+0x218/0x280
[    7.997249]  ___sys_sendmsg+0xac/0x100
[    8.001103]  __sys_sendmsg+0x84/0xe0
[    8.004776]  __arm64_sys_sendmsg+0x24/0x30
[    8.008983]  invoke_syscall+0x48/0x114
[    8.012840]  el0_svc_common.constprop.0+0xcc/0xec
[    8.017665]  do_el0_svc+0x38/0xb0
[    8.021071]  el0_svc+0x2c/0x84
[    8.024212]  el0t_64_sync_handler+0xf4/0x120
[    8.028598]  el0t_64_sync+0x190/0x194

Go back to the original behavior, if the automotive safety package
is found to be supported in hardware enable all the features unless
safety_feat_cfg is passed in saying this particular platform only
supports a subset of the features.

Fixes: 5ac712dcdfef ("net: stmmac: enable platform specific safety features")
Reported-by: Ning Cai <ncai@quicinc.com>
Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrew Halaney 2023-01-18 10:56:38 -06:00 committed by Greg Kroah-Hartman
parent a7d736cc3c
commit 120b8e527e
1 changed files with 14 additions and 0 deletions
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14
drivers/net/ethernet/stmicro/stmmac/dwmac5.c
View File

@ -186,11 +186,25 @@ static void dwmac5_handle_dma_err(struct net_device *ndev,
int dwmac5_safety_feat_config(void __iomem *ioaddr, unsigned int asp,
struct stmmac_safety_feature_cfg *safety_feat_cfg)
{
struct stmmac_safety_feature_cfg all_safety_feats = {
.tsoee = 1,
.mrxpee = 1,
.mestee = 1,
.mrxee = 1,
.mtxee = 1,
.epsi = 1,
.edpp = 1,
.prtyen = 1,
.tmouten = 1,
};
u32 value;
if (!asp)
return -EINVAL;
if (!safety_feat_cfg)
safety_feat_cfg = &all_safety_feats;
/* 1. Enable Safety Features */
value = readl(ioaddr + MTL_ECC_CONTROL);
value |= MEEAO; /* MTL ECC Error Addr Status Override */