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iommu/amd: Do not loop forever when trying to increase address space

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When increase_address_space() fails to allocate memory, alloc_pte()
will call it again until it succeeds. Do not loop forever while trying
to increase the address space and just return an error instead.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-3-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-05-04 14:54:10 +02:00
parent eb791aa70b
commit 5b8a9a047b
1 changed files with 12 additions and 1 deletions
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13
drivers/iommu/amd_iommu.c
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@ -1489,8 +1489,19 @@ static u64 *alloc_pte(struct protection_domain *domain,
amd_iommu_domain_get_pgtable(domain, &pgtable);
while (address > PM_LEVEL_SIZE(pgtable.mode)) {
*updated = increase_address_space(domain, address, gfp) || *updated;
bool upd = increase_address_space(domain, address, gfp);
/* Read new values to check if update was successful */
amd_iommu_domain_get_pgtable(domain, &pgtable);
/*
* Return an error if there is no memory to update the
* page-table.
*/
if (!upd && (address > PM_LEVEL_SIZE(pgtable.mode)))
return NULL;
*updated = *updated || upd;
}