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dmaengine: dmatest: Remove use of VLAs 

There's an ongoing effort to remove VLAs from the kernel
(https://lkml.org/lkml/2018/3/7/621) to eventually turn on -Wvla.
The test already pre-allocates some buffers with kmalloc so turn
the two VLAs in to pre-allocated kmalloc buffers.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Laura Abbott 2018-04-10 18:02:16 -07:00 committed by Vinod Koul
parent 60cc43fc88
commit 72ef08bf65
1 changed files with 13 additions and 3 deletions
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16
drivers/dma/dmatest.c
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@ -468,6 +468,8 @@ static int dmatest_func(void *data)
unsigned long long total_len = 0;
u8 align = 0;
bool is_memset = false;
dma_addr_t *srcs;
dma_addr_t *dma_pq;
set_freezable();
@ -551,6 +553,14 @@ static int dmatest_func(void *data)
set_user_nice(current, 10);
srcs = kcalloc(src_cnt, sizeof(dma_addr_t), GFP_KERNEL);
if (!srcs)
goto err_dstbuf;
dma_pq = kcalloc(dst_cnt, sizeof(dma_addr_t), GFP_KERNEL);
if (!dma_pq)
goto err_srcs_array;
/*
* src and dst buffers are freed by ourselves below
*/
@ -561,7 +571,6 @@ static int dmatest_func(void *data)
&& !(params->iterations && total_tests >= params->iterations)) {
struct dma_async_tx_descriptor *tx = NULL;
struct dmaengine_unmap_data *um;
dma_addr_t srcs[src_cnt];
dma_addr_t *dsts;
unsigned int src_off, dst_off, len;
@ -676,8 +685,6 @@ static int dmatest_func(void *data)
srcs, src_cnt,
len, flags);
else if (thread->type == DMA_PQ) {
dma_addr_t dma_pq[dst_cnt];
for (i = 0; i < dst_cnt; i++)
dma_pq[i] = dsts[i] + dst_off;
tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
@ -779,6 +786,9 @@ static int dmatest_func(void *data)
runtime = ktime_to_us(ktime);
ret = 0;
kfree(dma_pq);
err_srcs_array:
kfree(srcs);
err_dstbuf:
for (i = 0; thread->udsts[i]; i++)
kfree(thread->udsts[i]);