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authorMartin K. Petersen <martin.petersen@oracle.com>2009-06-03 09:33:18 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-06-03 09:33:18 +0200
commita05c0205ba031c01bba33a21bf0a35920eb64833 (patch)
tree517c7682fc415cdb122ee7fcfc75eff674cc7b78 /block/blk-settings.c
parentdbdc9dd342f0a7e32f40f0d4ade662bdfe057484 (diff)
downloadlinux-2.6.34-ux500-a05c0205ba031c01bba33a21bf0a35920eb64833.tar.gz
block: Fix bounce limit setting in DM
blk_queue_bounce_limit() is more than a wrapper about the request queue limits.bounce_pfn variable. Introduce blk_queue_bounce_pfn() which can be called by stacking drivers that wish to set the bounce limit explicitly. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-settings.c')
-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 8d339349289..9acd0b7e802 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