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drivers: uio_dmem_genirq: Don't use DMA_ERROR_CODE to indicate unmapped regions

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DMA_ERROR_CODE is not defined on all architectures and is architecture
specific.  Instead, use the constant, ~0 to indicate unmapped regions.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Cc: "Hans J. Koch" <hjk@hansjkoch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Damian Hobson-Garcia 2012-11-16 14:46:10 +09:00 committed by Greg Kroah-Hartman
parent 24fce61b0b
commit 87c4d1a7dc
2 changed files with 5 additions and 3 deletions
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2
Documentation/DocBook/uio-howto.tmpl
View file

@ -771,7 +771,7 @@ framework to set up sysfs files for this region. Simply leave it alone.
<varname>/sys/class/uio/uioX/maps/mapY/*</varname>.
The dynmaic memory regions will be freed when the UIO device file is
closed. When no processes are holding the device file open, the address
returned to userspace is DMA_ERROR_CODE.
returned to userspace is ~0.
</para>
</sect1>

6
drivers/uio/uio_dmem_genirq.c
View file

@ -29,6 +29,7 @@
#include <linux/of_address.h>
#define DRIVER_NAME "uio_dmem_genirq"
#define DMEM_MAP_ERROR (~0)
struct uio_dmem_genirq_platdata {
struct uio_info *uioinfo;
@ -60,6 +61,7 @@ static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode)
addr = dma_alloc_coherent(&priv->pdev->dev, uiomem->size,
(dma_addr_t *)&uiomem->addr, GFP_KERNEL);
if (!addr) {
uiomem->addr = DMEM_MAP_ERROR;
ret = -ENOMEM;
break;
}
@ -95,7 +97,7 @@ static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
dma_free_coherent(&priv->pdev->dev, uiomem->size,
priv->dmem_region_vaddr[dmem_region++],
uiomem->addr);
uiomem->addr = DMA_ERROR_CODE;
uiomem->addr = DMEM_MAP_ERROR;
++uiomem;
}
@ -238,7 +240,7 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
break;
}
uiomem->memtype = UIO_MEM_PHYS;
uiomem->addr = DMA_ERROR_CODE;
uiomem->addr = DMEM_MAP_ERROR;
uiomem->size = pdata->dynamic_region_sizes[i];
++uiomem;
}