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ion: carveout heap: zero buffers on free, fix memory leak

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The carveout heap wasn't zeroing its buffers after use.
Create the sg_table during allocate instead of map_dma, to allow
using the sg_table during free, and call ion_heap_buffer_zero
during free.  Also fixes a missing kfree when destroying the
table.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Cross 2013-12-13 19:26:29 -08:00 committed by Greg Kroah-Hartman
parent f63958d80c
commit ed5bf01aac
1 changed files with 48 additions and 21 deletions
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69
drivers/staging/android/ion/ion_carveout_heap.c
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@ -14,7 +14,7 @@
*
*/
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/genalloc.h>
#include <linux/io.h>
@ -60,7 +60,11 @@ static int ion_carveout_heap_phys(struct ion_heap *heap,
struct ion_buffer *buffer,
ion_phys_addr_t *addr, size_t *len)
{
*addr = buffer->priv_phys;
struct sg_table *table = buffer->priv_virt;
struct page *page = sg_page(table->sgl);
ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
*addr = paddr;
*len = buffer->size;
return 0;
}
@ -70,44 +74,66 @@ static int ion_carveout_heap_allocate(struct ion_heap *heap,
unsigned long size, unsigned long align,
unsigned long flags)
{
struct sg_table *table;
ion_phys_addr_t paddr;
int ret;
if (align > PAGE_SIZE)
return -EINVAL;
buffer->priv_phys = ion_carveout_allocate(heap, size, align);
return buffer->priv_phys == ION_CARVEOUT_ALLOCATE_FAIL ? -ENOMEM : 0;
table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
if (!table)
return -ENOMEM;
ret = sg_alloc_table(table, 1, GFP_KERNEL);
if (ret)
goto err_free;
paddr = ion_carveout_allocate(heap, size, align);
if (paddr == ION_CARVEOUT_ALLOCATE_FAIL) {
ret = -ENOMEM;
goto err_free_table;
}
sg_set_page(table->sgl, pfn_to_page(PFN_DOWN(paddr)), size, 0);
buffer->priv_virt = table;
return 0;
err_free_table:
sg_free_table(table);
err_free:
kfree(table);
return ret;
}
static void ion_carveout_heap_free(struct ion_buffer *buffer)
{
struct ion_heap *heap = buffer->heap;
struct sg_table *table = buffer->priv_virt;
struct page *page = sg_page(table->sgl);
ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
ion_carveout_free(heap, buffer->priv_phys, buffer->size);
buffer->priv_phys = ION_CARVEOUT_ALLOCATE_FAIL;
ion_heap_buffer_zero(buffer);
if (ion_buffer_cached(buffer))
dma_sync_sg_for_device(NULL, table->sgl, table->nents,
DMA_BIDIRECTIONAL);
ion_carveout_free(heap, paddr, buffer->size);
sg_free_table(table);
kfree(table);
}
static struct sg_table *ion_carveout_heap_map_dma(struct ion_heap *heap,
struct ion_buffer *buffer)
{
struct sg_table *table;
int ret;
table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
if (!table)
return ERR_PTR(-ENOMEM);
ret = sg_alloc_table(table, 1, GFP_KERNEL);
if (ret) {
kfree(table);
return ERR_PTR(ret);
}
sg_set_page(table->sgl, pfn_to_page(PFN_DOWN(buffer->priv_phys)),
buffer->size, 0);
return table;
return buffer->priv_virt;
}
static void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
struct ion_buffer *buffer)
{
sg_free_table(buffer->sg_table);
return;
}
static struct ion_heap_ops carveout_heap_ops = {
@ -139,6 +165,7 @@ struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
-1);
carveout_heap->heap.ops = &carveout_heap_ops;
carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
carveout_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
return &carveout_heap->heap;
}