[PATCH 2/7] iommu/omap: omap_iommu_attach() should return ENODEV, not NULL

[Florian Vaussard <florian.vaussard@epfl.ch>]

omap_iommu_attach() returns NULL or ERR_PTR in case of error, but
omap_iommu_attach_dev() only checks for IS_ERR. Thus a NULL return value (in
case driver_find_device fails) will cause the kernel to panic when
omap_iommu_attach_dev() dereferences the pointer.

In such case, omap_iommu_attach() should return ENODEV, not NULL.

Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
---
 drivers/iommu/omap-iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index ee83bcc..385bf5e 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -863,7 +863,7 @@ static int device_match_by_alias(struct device *dev, void *data)
  **/
 static struct omap_iommu *omap_iommu_attach(const char *name, u32 *iopgd)
 {
-	int err = -ENOMEM;
+	int err = -ENODEV;
 	struct device *dev;
 	struct omap_iommu *obj;
 
@@ -871,7 +871,7 @@ static struct omap_iommu *omap_iommu_attach(const char *name, u32 *iopgd)
 				(void *)name,
 				device_match_by_alias);
 	if (!dev)
-		return NULL;
+		return ERR_PTR(err);
 
 	obj = to_iommu(dev);
 
-- 
1.8.1.2