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RDMA: Check for NULL mode in .devnode methods 

Commits 71c29bd5c2 ("IB/uverbs: Add devnode method to set path/mode")
and c3af0980ce ("IB: Add devnode methods to cm_class and umad_class")
added devnode methods that set the mode.

However, these methods don't check for a NULL mode, and so we get a
crash when unloading modules because devtmpfs_delete_node() calls
device_get_devnode() with mode == NULL.

Add the missing checks.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.de>
[ Also fix cm.c.  - Roland ]
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Goldwyn Rodrigues 2011-07-04 09:26:57 -07:00 committed by Linus Torvalds
parent ba466c74d9
commit b2bc478219
2 changed files with 4 additions and 2 deletions
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3
drivers/infiniband/core/cm.c
View File

@ -3641,7 +3641,8 @@ static struct kobj_type cm_port_obj_type = {
static char *cm_devnode(struct device *dev, mode_t *mode)
{
*mode = 0666;
if (mode)
*mode = 0666;
return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
}

3
drivers/infiniband/core/uverbs_main.c
View File

@ -826,7 +826,8 @@ static void ib_uverbs_remove_one(struct ib_device *device)
static char *uverbs_devnode(struct device *dev, mode_t *mode)
{
*mode = 0666;
if (mode)
*mode = 0666;
return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
}