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Commit 1d676e02 authored by Pierre Ossman's avatar Pierre Ossman Committed by Russell King
Browse files

[MMC] sdhci: Test for invalid block size 



The controller has an upper limit on the block size. Make sure we do not
cross it.

Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent bab76961

drivers/mmc/sdhci.c

+11 −0
Original line number Diff line number Diff line
@@ -328,6 +328,8 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data) 


	/* Sanity checks */

	BUG_ON(data->blksz * data->blocks > 524288);

	BUG_ON(data->blksz > host->max_block);

	BUG_ON(data->blocks > 65535);



	/* timeout in us */

	target_timeout = data->timeout_ns / 1000 +
@@ -1158,6 +1160,15 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot) 
	if (caps & SDHCI_TIMEOUT_CLK_UNIT)

		host->timeout_clk *= 1000;



	host->max_block = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;

	if (host->max_block >= 3) {

		printk(KERN_ERR "%s: Invalid maximum block size.\n",

			host->slot_descr);

		ret = -ENODEV;

		goto unmap;

	}

	host->max_block = 512 << host->max_block;



	/*

	 * Set host parameters.

	 */

drivers/mmc/sdhci.h

+3 −0
Original line number Diff line number Diff line
@@ -131,6 +131,8 @@ 
#define  SDHCI_TIMEOUT_CLK_UNIT	0x00000080

#define  SDHCI_CLOCK_BASE_MASK	0x00003F00

#define  SDHCI_CLOCK_BASE_SHIFT	8

#define  SDHCI_MAX_BLOCK_MASK	0x00030000

#define  SDHCI_MAX_BLOCK_SHIFT  16

#define  SDHCI_CAN_DO_DMA	0x00400000

#define  SDHCI_CAN_VDD_330	0x01000000

#define  SDHCI_CAN_VDD_300	0x02000000
@@ -161,6 +163,7 @@ struct sdhci_host { 


	unsigned int		max_clk;	/* Max possible freq (MHz) */

	unsigned int		timeout_clk;	/* Timeout freq (KHz) */

	unsigned int		max_block;	/* Max block size (bytes) */



	unsigned int		clock;		/* Current clock (MHz) */

	unsigned short		power;		/* Current voltage */