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drivers: uio_dmem_genirq: Don't mix address spaces for dynamic region vaddr 

Assigning the virtual address returned from dma_alloc_coherent to the the
internal_addr element of uioinfo produces the following sparse errors since
internal_addr is a void __iomem * and dma_alloc_coherent returns void *.

+ drivers/uio/uio_dmem_genirq.c:65:39: sparse: incorrect type in assignment (different address spaces)
  drivers/uio/uio_dmem_genirq.c:65:39:    expected void [noderef] <asn:2>*internal_addr
  drivers/uio/uio_dmem_genirq.c:65:39:    got void *[assigned] addr
+ drivers/uio/uio_dmem_genirq.c:93:17: sparse: incorrect type in argument 3 (different address spaces)
  drivers/uio/uio_dmem_genirq.c:93:17:    expected void *vaddr
  drivers/uio/uio_dmem_genirq.c:93:17:    got void [noderef] <asn:2>*internal_addr

Store the void * in the driver's private data instead.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
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 14:46:09 +09:00 committed by Greg Kroah-Hartman
parent 9b96c3124b
commit 24fce61b0b
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/uio/uio_dmem_genirq.c
View File

@ -37,6 +37,7 @@ struct uio_dmem_genirq_platdata {
struct platform_device *pdev;
unsigned int dmem_region_start;
unsigned int num_dmem_regions;
void *dmem_region_vaddr[MAX_UIO_MAPS];
struct mutex alloc_lock;
unsigned int refcnt;
};
@ -46,6 +47,7 @@ static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode)
struct uio_dmem_genirq_platdata *priv = info->priv;
struct uio_mem *uiomem;
int ret = 0;
int dmem_region = priv->dmem_region_start;
uiomem = &priv->uioinfo->mem[priv->dmem_region_start];
@ -61,8 +63,7 @@ static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode)
ret = -ENOMEM;
break;
}
uiomem->internal_addr = addr;
priv->dmem_region_vaddr[dmem_region++] = addr;
++uiomem;
}
priv->refcnt++;
@ -77,6 +78,7 @@ static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
{
struct uio_dmem_genirq_platdata *priv = info->priv;
struct uio_mem *uiomem;
int dmem_region = priv->dmem_region_start;
/* Tell the Runtime PM code that the device has become idle */
pm_runtime_put_sync(&priv->pdev->dev);
@ -91,7 +93,8 @@ static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
break;
dma_free_coherent(&priv->pdev->dev, uiomem->size,
uiomem->internal_addr, uiomem->addr);
priv->dmem_region_vaddr[dmem_region++],
uiomem->addr);
uiomem->addr = DMA_ERROR_CODE;
++uiomem;
}