diff options
| author | Damian Hobson-Garcia <dhobsong@igel.co.jp> | 2012-11-16 06:46:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-21 22:44:10 +0100 |
| commit | 87c4d1a7dce956b86e34329ed1b11a751ba9a8ea (patch) | |
| tree | c16d799b2c39dbe51045c30ee94e9a88ec609b89 | |
| parent | drivers: uio_dmem_genirq: Don't mix address spaces for dynamic region vaddr (diff) | |
| download | linux-87c4d1a7dce956b86e34329ed1b11a751ba9a8ea.tar.xz linux-87c4d1a7dce956b86e34329ed1b11a751ba9a8ea.zip | |
drivers: uio_dmem_genirq: Don't use DMA_ERROR_CODE to indicate unmapped regions
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>
| -rw-r--r-- | Documentation/DocBook/uio-howto.tmpl | 2 | ||||
| -rw-r--r-- | drivers/uio/uio_dmem_genirq.c | 6 |
2 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/DocBook/uio-howto.tmpl b/Documentation/DocBook/uio-howto.tmpl index fdbf86fcfccd..ddb05e98af0d 100644 --- a/Documentation/DocBook/uio-howto.tmpl +++ b/Documentation/DocBook/uio-howto.tmpl @@ -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> diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c index d8bbe0783cdc..7be8d0421cae 100644 --- a/drivers/uio/uio_dmem_genirq.c +++ b/drivers/uio/uio_dmem_genirq.c @@ -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; } |