mmc_block: be prepared for oversized requests (548d2de9) · Commits · 戴 / test

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>

drivers/mmc/card/block.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -253,6 +253,14 @@ static int mmc_blk_issue_rq(struct mmc_queue mq, struct request req)
		brq.stop.flags = MMC_RSP_SPI_R1B \| MMC_RSP_R1B \| MMC_CMD_AC;
		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

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