From: Ben Dooks Date: Mon, 30 Jun 2008 21:40:39 +0000 (+0100) Subject: MMC: S3C24XX: Refuse incorrectly aligned transfers X-Git-Tag: v2.6.27-rc1~1047^2~11 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e9c7b64022b7faff6022df64baec8ab467d0bfd;p=linux-2.6 MMC: S3C24XX: Refuse incorrectly aligned transfers The hardware does not support any multi-block transfers with an block-size that is not 32bit aligned. Also the driver itself does not support single block non-32bit transfers either. Ensure that the s3cmci_setup_data() returns the appropriate error if we encounter this. Signed-off-by: Ben Dooks Signed-off-by: Pierre Ossman --- diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c index 2b48395369..6a1e4994b7 100644 --- a/drivers/mmc/host/s3cmci.c +++ b/drivers/mmc/host/s3cmci.c @@ -807,6 +807,17 @@ static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data) return 0; } + if ((data->blksz & 3) != 0) { + /* We cannot deal with unaligned blocks with more than + * one block being transfered. */ + + if (data->blocks > 1) + return -EINVAL; + + /* No support yet for non-word block transfers. */ + return -EINVAL; + } + while (readl(host->base + S3C2410_SDIDSTA) & (S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {