From aeec3021043b66a1418df416e1ba83def070cef1 Mon Sep 17 00:00:00 2001 From: Grygorii Strashko Date: Thu, 4 Aug 2016 18:20:51 +0300 Subject: [PATCH] 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 Reviewed-by: Ivan Khoronzhuk Signed-off-by: David S. Miller --- drivers/net/ethernet/ti/davinci_cpdma.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c index 19e5f32a8a64..cf72b3390d85 100644 --- a/drivers/net/ethernet/ti/davinci_cpdma.c +++ b/drivers/net/ethernet/ti/davinci_cpdma.c @@ -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) -- 2.20.1