These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / mm / dmapool.c

diff --git a/kernel/mm/dmapool.c b/kernel/mm/dmapool.c
index fd5fe43..57312b5 100644 (file)
--- a/kernel/mm/dmapool.c
+++ b/kernel/mm/dmapool.c
@@ -242,7 +242,7 @@ static struct dma_page *pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags)
        return page;
 }
 
-static inline int is_page_busy(struct dma_page *page)
+static inline bool is_page_busy(struct dma_page *page)
 {
        return page->in_use != 0;
 }
@@ -271,6 +271,9 @@ void dma_pool_destroy(struct dma_pool *pool)
 {
        bool empty = false;
 
+       if (unlikely(!pool))
+               return;
+
        mutex_lock(&pools_reg_lock);
        mutex_lock(&pools_lock);
        list_del(&pool->pools);
@@ -323,7 +326,7 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
        size_t offset;
        void *retval;
 
-       might_sleep_if(mem_flags & __GFP_WAIT);
+       might_sleep_if(gfpflags_allow_blocking(mem_flags));
 
        spin_lock_irqsave(&pool->lock, flags);
        list_for_each_entry(page, &pool->page_list, page_list) {
@@ -334,7 +337,7 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
        /* pool_alloc_page() might sleep, so temporarily drop &pool->lock */
        spin_unlock_irqrestore(&pool->lock, flags);
 
-       page = pool_alloc_page(pool, mem_flags);
+       page = pool_alloc_page(pool, mem_flags & (~__GFP_ZERO));
        if (!page)
                return NULL;
 
@@ -372,9 +375,14 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
                        break;
                }
        }
-       memset(retval, POOL_POISON_ALLOCATED, pool->size);
+       if (!(mem_flags & __GFP_ZERO))
+               memset(retval, POOL_POISON_ALLOCATED, pool->size);
 #endif
        spin_unlock_irqrestore(&pool->lock, flags);
+
+       if (mem_flags & __GFP_ZERO)
+               memset(retval, 0, pool->size);
+
        return retval;
 }
 EXPORT_SYMBOL(dma_pool_alloc);
@@ -386,7 +394,7 @@ static struct dma_page *pool_find_page(struct dma_pool *pool, dma_addr_t dma)
        list_for_each_entry(page, &pool->page_list, page_list) {
                if (dma < page->dma)
                        continue;
-               if (dma < (page->dma + pool->allocation))
+               if ((dma - page->dma) < pool->allocation)
                        return page;
        }
        return NULL;