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mmc: rtsx: check sg_count before long data xfer

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Check sg_count before sending long data xfer.
Because dma_map_sg() return int, and sg_count may be negative,
so using int instead of unsigned.

Signed-off-by: Micky Ching <micky_ching@realsil.com.cn>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Micky Ching 2015-01-14 11:09:12 +08:00 committed by Ulf Hansson
parent b22217f966
commit be186ad582
1 changed files with 9 additions and 2 deletions
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11
drivers/mmc/host/rtsx_pci_sdmmc.c
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@ -54,9 +54,9 @@ struct realtek_pci_sdmmc {
#define SDMMC_POWER_ON 1
#define SDMMC_POWER_OFF 0
unsigned int sg_count;
int sg_count;
s32 cookie;
unsigned int cookie_sg_count;
int cookie_sg_count;
bool using_cookie;
};
@ -557,6 +557,13 @@ static int sd_rw_multi(struct realtek_pci_sdmmc *host, struct mmc_request *mrq)
{
struct mmc_data *data = mrq->data;
if (host->sg_count < 0) {
data->error = host->sg_count;
dev_dbg(sdmmc_dev(host), "%s: sg_count = %d is invalid\n",
__func__, host->sg_count);
return data->error;
}
if (data->flags & MMC_DATA_READ)
return sd_read_long_data(host, mrq);