Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 2/5] iommu/amd: Do not loop forever when trying to increase address space | Date | Mon, 4 May 2020 14:54:10 +0200 |
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From: Joerg Roedel <jroedel@suse.de>
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.
Tested-by: Qian Cai <cai@lca.pw> Signed-off-by: Joerg Roedel <jroedel@suse.de> --- drivers/iommu/amd_iommu.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 28229a38af4d..68da484a69dd 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -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; } -- 2.17.1
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