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authorPierre Ossman <pierre@ossman.eu>2009-04-10 17:52:57 +0200
committerPierre Ossman <pierre@ossman.eu>2009-05-03 22:11:00 +0200
commit548d2de9bd978a4d4e941477500f1ab97aade137 (patch)
tree28c3464c82296de10737f9174c775ae92a9c2727 /drivers
parent0c8454f56623505a99463405fd7d5664adfbb094 (diff)
downloadlinux-548d2de9bd978a4d4e941477500f1ab97aade137.tar.bz2
mmc_block: be prepared for oversized requests
The block layer does not support very low sector count restrictions so we need to be prepared to handle bigger requests than we can send directly to the controller. Problem found by Manuel Lauss. Signed-off-by: Pierre Ossman <pierre@ossman.eu>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mmc/card/block.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index fe8041e619ea..b25e9b6516ae 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -254,6 +254,14 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
brq.data.blocks = req->nr_sectors;
/*
+ * The block layer doesn't support all sector count
+ * restrictions, so we need to be prepared for too big
+ * requests.
+ */
+ if (brq.data.blocks > card->host->max_blk_count)
+ brq.data.blocks = card->host->max_blk_count;
+
+ /*
* After a read error, we redo the request one sector at a time
* in order to accurately determine which sectors can be read
* successfully.