On Sun, Apr 29 2018, Christian Lütke-Stetzkamp wrote: > Current code initialises the variable sg at the beginning of the > msdc_dma_config function. This is not necessary, because the variable > is assigned by the for_each_sg macro later on.
But it isn't only used by the for_each_sg macro.
switch (dma->mode) {
case MSDC_MODE_DMA_BASIC:
BUG_ON(host->xfer_size > 65535);
BUG_ON(dma->sglen != 1);
sdr_write32(MSDC_DMA_SA, PHYSADDR(sg_dma_address(sg)));
This now references an uninitialized variable, as do several other
places.
Maybe you could move the initialization into the MSDC_MODE_DMA_BASIC
case.
Thanks,
NeilBrown
>
> Signed-off-by: Christian Lütke-Stetzkamp <christ...@lkamp.de>
> ---
> drivers/staging/mt7621-mmc/sd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/mt7621-mmc/sd.c b/drivers/staging/mt7621-mmc/sd.c
> index a2dce54e386c..c9f0180f3220 100644
> --- a/drivers/staging/mt7621-mmc/sd.c
> +++ b/drivers/staging/mt7621-mmc/sd.c
> @@ -1091,7 +1091,7 @@ static int msdc_dma_config(struct msdc_host *host,
> struct msdc_dma *dma)
> void __iomem *base = host->base;
> //u32 i, j, num, bdlen, arg, xfersz;
> u32 j, num;
> - struct scatterlist *sg = dma->sg;
> + struct scatterlist *sg;
> struct gpd *gpd;
> struct bd *bd;
>
> --
> 2.16.1
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