fpga: zynq_fpga: Fix the wrong usage of dma_map_sgtable()

dma_map_sgtable() returns only 0 or the error code. Read sgt->nents to
get the number of mapped segments.

Fixes: 37e0070 ("zynq_fpga: use sgtable-based scatterlist wrappers")
Reported-by: Pavel Pisa <[email protected]>
Closes: https://lore.kernel.org/linux-fpga/[email protected]/
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Marek Szyprowski <[email protected]>
Signed-off-by: Xu Yilun <[email protected]>
Tested-by: Pavel Pisa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Xu Yilun

drivers/fpga/zynq-fpga.c

@@ -405,12 +405,12 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt)
 		}
 	}
 
-	priv->dma_nelms =
-	    dma_map_sgtable(mgr->dev.parent, sgt, DMA_TO_DEVICE, 0);
-	if (priv->dma_nelms == 0) {
+	err = dma_map_sgtable(mgr->dev.parent, sgt, DMA_TO_DEVICE, 0);
+	if (err) {
 		dev_err(&mgr->dev, "Unable to DMA map (TO_DEVICE)\n");
-		return -ENOMEM;
+		return err;
 	}
+	priv->dma_nelms = sgt->nents;
 
 	/* enable clock */
 	err = clk_enable(priv->clk);