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Revert "dmaengine: imx-sdma: alloclate bd memory from dma pool" 

This reverts commit fe5b85c656. The SDMA engine needs the descriptors to
be contiguous in memory. As the dma pool API is only able to provide a
single descriptor per alloc invocation there is no guarantee that multiple
descriptors satisfy this requirement. Also the code in question is broken
as it only allocates memory for a single descriptor, without looking at the
number of descriptors required for the transfer, leading to out-of-bounds
accesses when the descriptors are written.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Lucas Stach 2018-11-06 03:40:28 +00:00 committed by Vinod Koul
parent c06abca692
commit ebb853b1bd
1 changed files with 6 additions and 12 deletions
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18
drivers/dma/imx-sdma.c
View File

@ -24,7 +24,6 @@
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
@ -376,7 +375,6 @@ struct sdma_channel {
u32 shp_addr, per_addr;
enum dma_status status;
struct imx_dma_data data;
struct dma_pool *bd_pool;
};
#define IMX_DMA_SG_LOOP BIT(0)
@ -1192,10 +1190,11 @@ out:
static int sdma_alloc_bd(struct sdma_desc *desc)
{
u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
int ret = 0;
desc->bd = dma_pool_alloc(desc->sdmac->bd_pool, GFP_ATOMIC,
&desc->bd_phys);
desc->bd = dma_zalloc_coherent(NULL, bd_size, &desc->bd_phys,
GFP_ATOMIC);
if (!desc->bd) {
ret = -ENOMEM;
goto out;
@ -1206,7 +1205,9 @@ out:
static void sdma_free_bd(struct sdma_desc *desc)
{
dma_pool_free(desc->sdmac->bd_pool, desc->bd, desc->bd_phys);
u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
dma_free_coherent(NULL, bd_size, desc->bd, desc->bd_phys);
}
static void sdma_desc_free(struct virt_dma_desc *vd)
@ -1272,10 +1273,6 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
if (ret)
goto disable_clk_ahb;
sdmac->bd_pool = dma_pool_create("bd_pool", chan->device->dev,
sizeof(struct sdma_buffer_descriptor),
32, 0);
return 0;
disable_clk_ahb:
@ -1304,9 +1301,6 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
clk_disable(sdma->clk_ipg);
clk_disable(sdma->clk_ahb);
dma_pool_destroy(sdmac->bd_pool);
sdmac->bd_pool = NULL;
}
static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,