staging: mt7621-mmc: Fix dma_map_sg may map to fewer entries
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@lkamp.de> Reviewed-by: NeilBrown <neil@brown.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1423,8 +1423,10 @@ static int msdc_do_request(struct mmc_host *mmc, struct mmc_request *mrq)
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goto done;
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dir = read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
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(void)dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, dir);
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msdc_dma_setup(host, &host->dma, data->sg, data->sg_len);
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data->sg_count = dma_map_sg(mmc_dev(mmc), data->sg,
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data->sg_len, dir);
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msdc_dma_setup(host, &host->dma, data->sg,
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data->sg_count);
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/* then wait command done */
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if (msdc_command_resp(host, cmd, 1, CMD_TIMEOUT) != 0)
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