From 4d31a2588ae37a5d0f61f4d956454e9504846aeb Mon Sep 17 00:00:00 2001 From: Jan Viktorin Date: Tue, 17 May 2016 11:22:17 +0200 Subject: [PATCH] uio: fix dmem_region_start computation The variable i contains a total number of resources (including IORESOURCE_IRQ). However, we want the dmem_region_start to point after the last resource of type IORESOURCE_MEM. The original behaviour leads (very likely) to skipping several UIO mapping regions and makes them useless. Fix this by computing dmem_region_start from the uiomem which points to the last used UIO mapping. Fixes: 0a0c3b5a24bd ("Add new uio device for dynamic memory allocation") Signed-off-by: Jan Viktorin Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio_dmem_genirq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c index 915facbf552e..e1134a4d97f3 100644 --- a/drivers/uio/uio_dmem_genirq.c +++ b/drivers/uio/uio_dmem_genirq.c @@ -229,7 +229,7 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev) ++uiomem; } - priv->dmem_region_start = i; + priv->dmem_region_start = uiomem - &uioinfo->mem[0]; priv->num_dmem_regions = pdata->num_dynamic_regions; for (i = 0; i < pdata->num_dynamic_regions; ++i) { -- 2.20.1