block: Fix bounce limit setting in DM

[mirror_ubuntu-zesty-kernel.git] / block / blk-settings.c

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 8d339349289182e84523117802893c4cc848b7d4..9acd0b7e802a7e1f3182024d4f6761a514c03c04 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -193,6 +193,23 @@ void blk_queue_bounce_limit(struct request_queue *q, u64 dma_mask)
 }
 EXPORT_SYMBOL(blk_queue_bounce_limit);
 
+/**
+ * blk_queue_bounce_pfn - set the bounce buffer limit for queue
+ * @q: the request queue for the device
+ * @pfn: max address
+ *
+ * Description:
+ *    This function is similar to blk_queue_bounce_limit except it
+ *    neither changes allocation flags, nor does it set up the ISA DMA
+ *    pool. This function should only be used by stacking drivers.
+ *    Hardware drivers should use blk_queue_bounce_limit instead.
+ */
+void blk_queue_bounce_pfn(struct request_queue *q, u64 pfn)
+{
+       q->limits.bounce_pfn = pfn;
+}
+EXPORT_SYMBOL(blk_queue_bounce_pfn);
+
 /**
  * blk_queue_max_sectors - set max sectors for a request for this queue
  * @q:  the request queue for the device