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-rw-r--r--block/blk-settings.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 8d3393492891..9acd0b7e802a 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -194,6 +194,23 @@ 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
* @max_sectors: max sectors in the usual 512b unit