From: Micky Ching <micky_ching@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
---
drivers/mmc/host/rtsx_pci_sdmmc.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
index b435806..1d3d6c4 100644
--- a/drivers/mmc/host/rtsx_pci_sdmmc.c
+++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
@@ -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);
--
1.9.1
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