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staging: drm/omap: Add error handling 

This patch adds fail checks for kmalloc and kzalloc calls
and also adds a error path that frees allocated pages by
introducing a call to _drm_gem_put_pages.

Signed-off-by: Emil Goode <emilgoode@gmail.com>
Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Emil Goode 2012-08-17 18:53:26 +02:00 committed by Greg Kroah-Hartman
parent 79e3f02887
commit d4eb23a98f
1 changed files with 16 additions and 1 deletions
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17
drivers/staging/omapdrm/omap_gem.c
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@ -226,7 +226,8 @@ static int omap_gem_attach_pages(struct drm_gem_object *obj)
struct drm_device *dev = obj->dev;
struct omap_gem_object *omap_obj = to_omap_bo(obj);
struct page **pages;
int i, npages = obj->size >> PAGE_SHIFT;
int npages = obj->size >> PAGE_SHIFT;
int i, ret;
dma_addr_t *addrs;
WARN_ON(omap_obj->pages);
@ -246,18 +247,32 @@ static int omap_gem_attach_pages(struct drm_gem_object *obj)
*/
if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
addrs = kmalloc(npages * sizeof(addrs), GFP_KERNEL);
if (!addrs) {
ret = -ENOMEM;
goto free_pages;
}
for (i = 0; i < npages; i++) {
addrs[i] = dma_map_page(dev->dev, pages[i],
0, PAGE_SIZE, DMA_BIDIRECTIONAL);
}
} else {
addrs = kzalloc(npages * sizeof(addrs), GFP_KERNEL);
if (!addrs) {
ret = -ENOMEM;
goto free_pages;
}
}
omap_obj->addrs = addrs;
omap_obj->pages = pages;
return 0;
free_pages:
_drm_gem_put_pages(obj, pages, true, false);
return ret;
}
/** release backing pages */