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authorDamian Hobson-Garcia <dhobsong@igel.co.jp>2012-11-16 09:46:11 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-11-22 01:44:10 +0400
commit439926c81c01f31f9ffa7af7bf2d242b7f794f3c (patch)
tree1a89ba861796fd5e8b00733810b4c0987dd1b9ef /drivers/uio/uio_dmem_genirq.c
parent87c4d1a7dce956b86e34329ed1b11a751ba9a8ea (diff)
downloadlinux-439926c81c01f31f9ffa7af7bf2d242b7f794f3c.tar.xz
drivers: uio_dmem_genirq: Allow partial success when opening device
The uio device should not fail on open just because one memory allocation fails. The device might export several regions, the failure of some of which may or may not be a problem for the user space driver. Failing regions will remain unmapped, and successful regions will be mapped and exported to user space. Also deals with the case where failing to map a region after successfully allocating others would not unmap the successfully allocated regions before dying. 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>
Diffstat (limited to 'drivers/uio/uio_dmem_genirq.c')
-rw-r--r--drivers/uio/uio_dmem_genirq.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c
index 7be8d0421cae..bbdf92559e3f 100644
--- a/drivers/uio/uio_dmem_genirq.c
+++ b/drivers/uio/uio_dmem_genirq.c
@@ -62,8 +62,6 @@ static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode)
(dma_addr_t *)&uiomem->addr, GFP_KERNEL);
if (!addr) {
uiomem->addr = DMEM_MAP_ERROR;
- ret = -ENOMEM;
- break;
}
priv->dmem_region_vaddr[dmem_region++] = addr;
++uiomem;
@@ -93,11 +91,13 @@ static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
while (!priv->refcnt && uiomem < &priv->uioinfo->mem[MAX_UIO_MAPS]) {
if (!uiomem->size)
break;
-
- dma_free_coherent(&priv->pdev->dev, uiomem->size,
- priv->dmem_region_vaddr[dmem_region++],
- uiomem->addr);
+ if (priv->dmem_region_vaddr[dmem_region]) {
+ dma_free_coherent(&priv->pdev->dev, uiomem->size,
+ priv->dmem_region_vaddr[dmem_region],
+ uiomem->addr);
+ }
uiomem->addr = DMEM_MAP_ERROR;
+ ++dmem_region;
++uiomem;
}