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x86/pci: Return pci_mmconfig_add() failure early

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If pci_mmconfig_alloc() fails, return the failure early so it's obvious
that the failure is the exception, and the success is the normal case.  No
functional change intended.

Link: https://lore.kernel.org/r/20231121183643.249006-9-helgaas@kernel.org
Tested-by: Tomasz Pala <gotar@polanet.pl>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2023-11-21 12:36:42 -06:00
parent f284dff47b
commit f126598326
1 changed files with 8 additions and 7 deletions
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15
arch/x86/pci/mmconfig-shared.c
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@ -102,14 +102,15 @@ struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
struct pci_mmcfg_region *new;
new = pci_mmconfig_alloc(segment, start, end, addr);
if (new) {
mutex_lock(&pci_mmcfg_lock);
list_add_sorted(new);
mutex_unlock(&pci_mmcfg_lock);
if (!new)
return NULL;
pr_info("ECAM %pR (base %#lx) for domain %04x [bus %02x-%02x]\n",
&new->res, (unsigned long)addr, segment, start, end);
}
mutex_lock(&pci_mmcfg_lock);
list_add_sorted(new);
mutex_unlock(&pci_mmcfg_lock);
pr_info("ECAM %pR (base %#lx) for domain %04x [bus %02x-%02x]\n",
&new->res, (unsigned long)addr, segment, start, end);
return new;
}