The dma_map_sg function may merge several sglist entries into one, the return value has to be saved to consider that. The data->sg_count field is the position, where it should be saved, like it is done in other mmc host drivers. Also the count of mapped entries is needed for the dma setup. Signed-off-by: Christian Lütke-Stetzkamp <christian@xxxxxxxx> --- drivers/staging/mt7621-mmc/sd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/staging/mt7621-mmc/sd.c b/drivers/staging/mt7621-mmc/sd.c index bff270dfbe58..3adb37895d03 100644 --- a/drivers/staging/mt7621-mmc/sd.c +++ b/drivers/staging/mt7621-mmc/sd.c @@ -1423,8 +1423,10 @@ static int msdc_do_request(struct mmc_host *mmc, struct mmc_request *mrq) goto done; dir = read ? DMA_FROM_DEVICE : DMA_TO_DEVICE; - (void)dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, dir); - msdc_dma_setup(host, &host->dma, data->sg, data->sg_len); + data->sg_count = dma_map_sg(mmc_dev(mmc), data->sg, + data->sg_len, dir); + msdc_dma_setup(host, &host->dma, data->sg, + data->sg_count); /* then wait command done */ if (msdc_command_resp(host, cmd, 1, CMD_TIMEOUT) != 0) -- 2.16.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
