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PCI DEN0115: Reliably check for a memory resource during probe.
rid was stack garbage, so the bus_alloc_resource_any() call could fail
and fall through to the SMCCC version check even if a bridge had a
memory resource.
Debugging help: jrtc27
Reviewed by: jrtc27
Fixes: c9a05c0722
Add a PCI driver that follows the Arm DEN0115 spec
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D41025
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@ -71,10 +71,11 @@ pci_host_acpi_smccc_probe(device_t dev)
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return (ENXIO);
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/*
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* Check we have memory resources. We may have a non-memory
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* Check if we have memory resources. We may have a non-memory
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* mapped device, e.g. using the Arm PCI Configuration Space
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* Access Firmware Interface (DEN0115).
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*/
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rid = 0;
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res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
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if (res != NULL) {
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bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
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