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net: ethernet: ti: cpdma: remove used_desc counter 

The struct cpdma_desc_pool->used_desc field can be safely removed from
CPDMA driver (and hot patch) because used_descs counter is used just
for pool consistency check at CPDMA deinitialization and now this
check can be re-implemnted using gen_pool_size(pool->gen_pool) !=
gen_pool_avail(pool->gen_pool).
More over, this will allow to get rid of warnings in
cpdma_desc_pool_destro()-> WARN_ON(pool->used_desc) which may happen
because the used_descs is used unprotected, since CPDMA has been
switched to use genalloc, and may get wrong values on SMP.

Hence, remove used_desc from struct cpdma_desc_pool.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Grygorii Strashko 2016-08-04 18:20:51 +03:00 committed by David S. Miller
parent 37088f617d
commit aeec302104
1 changed files with 7 additions and 11 deletions
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18
drivers/net/ethernet/ti/davinci_cpdma.c
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@ -86,7 +86,7 @@ struct cpdma_desc_pool {
void __iomem *iomap; /* ioremap map */
void *cpumap; /* dma_alloc map */
int desc_size, mem_size;
int num_desc, used_desc;
int num_desc;
struct device *dev;
struct gen_pool *gen_pool;
};
@ -148,7 +148,10 @@ static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool)
if (!pool)
return;
WARN_ON(pool->used_desc);
WARN(gen_pool_size(pool->gen_pool) != gen_pool_avail(pool->gen_pool),
"cpdma_desc_pool size %d != avail %d",
gen_pool_size(pool->gen_pool),
gen_pool_avail(pool->gen_pool));
if (pool->cpumap)
dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap,
pool->phys);
@ -232,21 +235,14 @@ desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma)
static struct cpdma_desc __iomem *
cpdma_desc_alloc(struct cpdma_desc_pool *pool)
{
struct cpdma_desc __iomem *desc = NULL;
desc = (struct cpdma_desc __iomem *)gen_pool_alloc(pool->gen_pool,
pool->desc_size);
if (desc)
pool->used_desc++;
return desc;
return (struct cpdma_desc __iomem *)
gen_pool_alloc(pool->gen_pool, pool->desc_size);
}
static void cpdma_desc_free(struct cpdma_desc_pool *pool,
struct cpdma_desc __iomem *desc, int num_desc)
{
gen_pool_free(pool->gen_pool, (unsigned long)desc, pool->desc_size);
pool->used_desc--;
}
struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)