5.4-stable review patch. If anyone has any objections, please let me know.
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From: Xu Yilun yilun.xu@linux.intel.com
commit 1ca61060de92a4320d73adfe5dc8d335653907ac upstream.
dma_map_sgtable() returns only 0 or the error code. Read sgt->nents to get the number of mapped segments.
Fixes: 37e00703228a ("zynq_fpga: use sgtable-based scatterlist wrappers") Reported-by: Pavel Pisa pisa@fel.cvut.cz Closes: https://lore.kernel.org/linux-fpga/202508041548.22955.pisa@fel.cvut.cz/ Reviewed-by: Jason Gunthorpe jgg@nvidia.com Reviewed-by: Marek Szyprowski m.szyprowski@samsung.com Signed-off-by: Xu Yilun yilun.xu@linux.intel.com Tested-by: Pavel Pisa pisa@fel.cvut.cz Link: https://lore.kernel.org/r/20250806070605.1920909-2-yilun.xu@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/fpga/zynq-fpga.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/fpga/zynq-fpga.c +++ b/drivers/fpga/zynq-fpga.c @@ -405,12 +405,12 @@ static int zynq_fpga_ops_write(struct fp } }
- 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);