Hi Prathyush,
The same should be applied even for : "__iommu_alloc_buffer" in arch/arm/mm/dma-mappping.c
static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) { struct page **pages; int count = size >> PAGE_SHIFT; int array_size = count * sizeof(struct page *); int i = 0;
if (array_size <= PAGE_SIZE) pages = kzalloc(array_size, gfp); else pages = vzalloc(array_size); if (!pages) return NULL;
while (count) { int j, order = __fls(count);
pages[i] = alloc_pages(gfp | __GFP_NOWARN, order); while (!pages[i] && order) pages[i] = alloc_pages(gfp | __GFP_NOWARN, --order); if (!pages[i]) goto error;
if (order) split_page(pages[i], order); j = 1 << order; while (--j) pages[i + j] = pages[i] + j;
__dma_clear_buffer(pages[i], PAGE_SIZE << order); i += 1 << order; count -= 1 << order; }
return pages; error: while (--i) if (pages[i]) __free_pages(pages[i], 0); if (array_size < PAGE_SIZE) kfree(pages); else vfree(pages); return NULL; }
Regards, Abhinav
On Fri, Jul 6, 2012 at 6:54 AM, Prathyush K prathyush.k@samsung.com wrote:
WARNING: at mm/vmalloc.c:1471 __iommu_free_buffer+0xcc/0xd0() Trying to vfree() nonexistent vm area (ef095000) Modules linked in: [<c0015a18>] (unwind_backtrace+0x0/0xfc) from [<c0025a94>] (warn_slowpath_common+0x54/0x64) [<c0025a94>] (warn_slowpath_common+0x54/0x64) from [<c0025b38>] (warn_slowpath_fmt+0x30/0x40) [<c0025b38>] (warn_slowpath_fmt+0x30/0x40) from [<c0016de0>] (__iommu_free_buffer+0xcc/0xd0) [<c0016de0>] (__iommu_free_buffer+0xcc/0xd0) from [<c0229a5c>] (exynos_drm_free_buf+0xe4/0x138) [<c0229a5c>] (exynos_drm_free_buf+0xe4/0x138) from [<c022b358>] (exynos_drm_gem_destroy+0x80/0xfc) [<c022b358>] (exynos_drm_gem_destroy+0x80/0xfc) from [<c0211230>] (drm_gem_object_free+0x28/0x34) [<c0211230>] (drm_gem_object_free+0x28/0x34) from [<c0211bd0>] (drm_gem_object_release_handle+0xcc/0xd8) [<c0211bd0>] (drm_gem_object_release_handle+0xcc/0xd8) from [<c01abe10>] (idr_for_each+0x74/0xb8) [<c01abe10>] (idr_for_each+0x74/0xb8) from [<c02114e4>] (drm_gem_release+0x1c/0x30) [<c02114e4>] (drm_gem_release+0x1c/0x30) from [<c0210ae8>] (drm_release+0x608/0x694) [<c0210ae8>] (drm_release+0x608/0x694) from [<c00b75a0>] (fput+0xb8/0x228) [<c00b75a0>] (fput+0xb8/0x228) from [<c00b40c4>] (filp_close+0x64/0x84) [<c00b40c4>] (filp_close+0x64/0x84) from [<c0029d54>] (put_files_struct+0xe8/0x104) [<c0029d54>] (put_files_struct+0xe8/0x104) from [<c002b930>] (do_exit+0x608/0x774) [<c002b930>] (do_exit+0x608/0x774) from [<c002bae4>] (do_group_exit+0x48/0xb4) [<c002bae4>] (do_group_exit+0x48/0xb4) from [<c002bb60>] (sys_exit_group+0x10/0x18) [<c002bb60>] (sys_exit_group+0x10/0x18) from [<c000ee80>] (ret_fast_syscall+0x0/0x30)
This patch modifies the condition while freeing to match the condition used while allocation. This fixes the above warning which arises when array size is equal to PAGE_SIZE where allocation is done using kzalloc but free is done using vfree.
Signed-off-by: Prathyush K prathyush.k@samsung.com
arch/arm/mm/dma-mapping.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index dc560dc..62fefac 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1106,7 +1106,7 @@ static int __iommu_free_buffer(struct device *dev, struct page **pages, size_t s for (i = 0; i < count; i++) if (pages[i]) __free_pages(pages[i], 0);
if (array_size < PAGE_SIZE)
if (array_size <= PAGE_SIZE) kfree(pages); else vfree(pages);-- 1.7.0.4
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