| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.8 044/125] uio: fix dmem_region_start computation | Date | Sat, 29 Oct 2016 09:49:22 -0400 |
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4.8-stable review patch. If anyone has any objections, please let me know.
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From: Jan Viktorin <viktorin@rehivetech.com>
commit 4d31a2588ae37a5d0f61f4d956454e9504846aeb upstream.
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 <viktorin@rehivetech.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/uio/uio_dmem_genirq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- 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 ++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) {
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