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PCI: keystone: Add link up check to ks_pcie_other_map_bus()

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commit 9e9ec8d8692a6f64d81ef67d4fb6255af6be684b upstream.

K2G forwards the error triggered by a link-down state (e.g., no connected
endpoint device) on the system bus for PCI configuration transactions;
these errors are reported as an SError at system level, which is fatal and
hangs the system.

So, apply fix similar to how it was done in the DesignWare Core driver
commit 15b23906347c ("PCI: dwc: Add link up check in dw_child_pcie_ops.map_bus()").

Fixes: 10a797c6e54a ("PCI: dwc: keystone: Use pci_ops for config space accessors")
Link: https://lore.kernel.org/r/20240524105714.191642-3-s-vadapalli@ti.com
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
[kwilczynski: commit log, added tag for stable releases]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kishon Vijay Abraham I 2024-05-24 16:27:14 +05:30 • committed by Ksawlii
parent 8f1ddcbdf6
commit 6044c0ed64
1 changed files with 11 additions and 0 deletions
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11
drivers/pci/controller/dwc/pci-keystone.c
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@ -439,6 +439,17 @@ static void __iomem *ks_pcie_other_map_bus(struct pci_bus *bus,
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
u32 reg;
/*
* Checking whether the link is up here is a last line of defense
* against platforms that forward errors on the system bus as
* SError upon PCI configuration transactions issued when the link
* is down. This check is racy by definition and does not stop
* the system from triggering an SError if the link goes down
* after this check is performed.
*/
if (!dw_pcie_link_up(pci))
return NULL;
reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
CFG_FUNC(PCI_FUNC(devfn));
if (!pci_is_root_bus(bus->parent))