diff options
Diffstat (limited to 'kernel/dma')
| -rw-r--r-- | kernel/dma/swiotlb.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index adf80dec42d7..d7eac84f975b 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -730,7 +730,7 @@ static void swiotlb_dyn_alloc(struct work_struct *work) add_mem_pool(mem, pool); - /* Pairs with smp_rmb() in swiotlb_find_pool(). */ + /* Pairs with smp_rmb() in is_swiotlb_buffer(). */ smp_wmb(); } @@ -764,11 +764,6 @@ struct io_tlb_pool *swiotlb_find_pool(struct device *dev, phys_addr_t paddr) struct io_tlb_mem *mem = dev->dma_io_tlb_mem; struct io_tlb_pool *pool; - /* Pairs with smp_wmb() in swiotlb_find_slots() and - * swiotlb_dyn_alloc(), which modify the RCU lists. - */ - smp_rmb(); - rcu_read_lock(); list_for_each_entry_rcu(pool, &mem->pools, node) { if (paddr >= pool->start && paddr < pool->end) @@ -813,6 +808,7 @@ void swiotlb_dev_init(struct device *dev) #ifdef CONFIG_SWIOTLB_DYNAMIC INIT_LIST_HEAD(&dev->dma_io_tlb_pools); spin_lock_init(&dev->dma_io_tlb_lock); + dev->dma_uses_io_tlb = false; #endif } @@ -1157,9 +1153,11 @@ static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr, list_add_rcu(&pool->node, &dev->dma_io_tlb_pools); spin_unlock_irqrestore(&dev->dma_io_tlb_lock, flags); - /* Pairs with smp_rmb() in swiotlb_find_pool(). */ - smp_wmb(); found: + dev->dma_uses_io_tlb = true; + /* Pairs with smp_rmb() in is_swiotlb_buffer() */ + smp_wmb(); + *retpool = pool; return index; } |