Commit 9c284c41 authored by Chris Brandt's avatar Chris Brandt Committed by Ulf Hansson

mmc: tmio-mmc: fix bad pointer math

The existing code gives an incorrect pointer value.
The buffer pointer 'buf' was of type unsigned short *, and 'count' was a
number in bytes. A cast of buf should have been used.

However, instead of casting, just change the code to use u32 pointers.
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Fixes: 8185e51f: ("mmc: tmio-mmc: add support for 32bit data port")
Signed-off-by: default avatarChris Brandt <chris.brandt@renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent bbdc74dc
......@@ -409,30 +409,29 @@ static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
* Transfer the data
*/
if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) {
u8 data[4] = { };
u32 data = 0;
u32 *buf32 = (u32 *)buf;
if (is_read)
sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, (u32 *)buf,
sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32,
count >> 2);
else
sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, (u32 *)buf,
sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32,
count >> 2);
/* if count was multiple of 4 */
if (!(count & 0x3))
return;
buf8 = (u8 *)(buf + (count >> 2));
buf32 += count >> 2;
count %= 4;
if (is_read) {
sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT,
(u32 *)data, 1);
memcpy(buf8, data, count);
sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1);
memcpy(buf32, &data, count);
} else {
memcpy(data, buf8, count);
sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT,
(u32 *)data, 1);
memcpy(&data, buf32, count);
sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1);
}
return;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment