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Commit 4d31a258 authored by Jan Viktorin's avatar Jan Viktorin Committed by Greg Kroah-Hartman
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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: 0a0c3b5a ("Add new uio device for dynamic memory allocation")

Signed-off-by: default avatarJan Viktorin <viktorin@rehivetech.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e97b1c6a

drivers/uio/uio_dmem_genirq.c

+1 −1
Original line number Diff line number Diff line
@@ -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) {