diff options
Diffstat (limited to 'arch/alpha')
| -rw-r--r-- | arch/alpha/kernel/pci_iommu.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c index bbf9990cd23..e54f829528c 100644 --- a/arch/alpha/kernel/pci_iommu.c +++ b/arch/alpha/kernel/pci_iommu.c @@ -132,12 +132,15 @@ iommu_arena_find_pages(struct pci_iommu_arena *arena, long n, long mask) { unsigned long *ptes; long i, p, nent; + int pass = 0; /* Search forward for the first mask-aligned sequence of N free ptes */ ptes = arena->ptes; nent = arena->size >> PAGE_SHIFT; p = ALIGN(arena->next_entry, mask + 1); i = 0; + +again: while (i < n && p+i < nent) { if (ptes[p+i]) p = ALIGN(p + i + 1, mask + 1), i = 0; @@ -146,19 +149,18 @@ iommu_arena_find_pages(struct pci_iommu_arena *arena, long n, long mask) } if (i < n) { - /* Reached the end. Flush the TLB and restart the - search from the beginning. */ - alpha_mv.mv_pci_tbi(arena->hose, 0, -1); - - p = 0, i = 0; - while (i < n && p+i < nent) { - if (ptes[p+i]) - p = ALIGN(p + i + 1, mask + 1), i = 0; - else - i = i + 1; - } - - if (i < n) + if (pass < 1) { + /* + * Reached the end. Flush the TLB and restart + * the search from the beginning. + */ + alpha_mv.mv_pci_tbi(arena->hose, 0, -1); + + pass++; + p = 0; + i = 0; + goto again; + } else return -1; } |