mmc: block: avoid multiblock reads for the last sector in SPI mode (41591b38) · Commits · 戴 / test

On some SD cards over SPI, reading with the multiblock read command the last sector will leave the card in a bad state. Remove last sectors from the multiblock reading cmd. Signed-off-by:

Chris Boot <bootc@bootc.net> Signed-off-by:

Clément Péron <peron.clem@gmail.com> Cc: stable@vger.kernel.org # v4.10+ Signed-off-by:

Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/core/block.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -1370,6 +1370,16 @@ static void mmc_blk_data_prep(struct mmc_queue mq, struct mmc_queue_req mqrq,
		brq->data.blocks = card->host->max_blk_count;

		if (brq->data.blocks > 1) {
		/*
		* Some SD cards in SPI mode return a CRC error or even lock up
		* completely when trying to read the last block using a
		* multiblock read command.
		*/
		if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
		(blk_rq_pos(req) + blk_rq_sectors(req) ==
		get_capacity(md->disk)))
		brq->data.blocks--;

		/*
		* After a read error, we redo the request one sector
		* at a time in order to accurately determine which

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