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| author |   Nicholas Piggin <npiggin@gmail.com> | 2019-06-10 13:08:16 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-06-19 20:05:09 +1000 |
| commit | a72808a7ec5d340417a91a81e5cabdaa50650f2e (patch) | |
| tree | bf4f3481124482cb42d3ea184d1e93b2b50d76c8 | |
| parent | powerpc/perf: Use cpumask_last() to determine the designated cpu for nest/core units. (diff) | |
| download | linux-dev-a72808a7ec5d340417a91a81e5cabdaa50650f2e.tar.xz linux-dev-a72808a7ec5d340417a91a81e5cabdaa50650f2e.zip | |
powerpc/64: __ioremap_at clean up in the error case
__ioremap_at error handling is wonky, it requires caller to clean up
after it. Implement a helper that does the map and error cleanup and
remove the requirement from the caller.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index d2d976ff8a0e..6bd3660388aa 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -108,14 +108,30 @@ unsigned long ioremap_bot; unsigned long ioremap_bot = IOREMAP_BASE; #endif +static int ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot, int nid) +{ + unsigned long i; + + for (i = 0; i < size; i += PAGE_SIZE) { + int err = map_kernel_page(ea + i, pa + i, prot); + if (err) { + if (slab_is_available()) + unmap_kernel_range(ea, size); + else + WARN_ON_ONCE(1); /* Should clean up */ + return err; + } + } + + return 0; +} + /** * __ioremap_at - Low level function to establish the page tables * for an IO mapping */ void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot) { - unsigned long i; - /* We don't support the 4K PFN hack with ioremap */ if (pgprot_val(prot) & H_PAGE_4K_PFN) return NULL; @@ -129,9 +145,8 @@ void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_ WARN_ON(((unsigned long)ea) & ~PAGE_MASK); WARN_ON(size & ~PAGE_MASK); - for (i = 0; i < size; i += PAGE_SIZE) - if (map_kernel_page((unsigned long)ea + i, pa + i, prot)) - return NULL; + if (ioremap_range((unsigned long)ea, pa, size, prot, NUMA_NO_NODE)) + return NULL; return (void __iomem *)ea; } @@ -182,8 +197,6 @@ void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size, area->phys_addr = paligned; ret = __ioremap_at(paligned, area->addr, size, prot); - if (!ret) - vunmap(area->addr); } else { ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot); if (ret) |