diff options
| author | Thomas Pugliese <thomas.pugliese@gmail.com> | 2014-08-07 15:45:35 -0500 |
|---|---|---|
| committer | Zefan Li <lizefan@huawei.com> | 2014-12-01 18:02:28 +0800 |
| commit | 96eb53749fbfd77b92031cc6b97458fe5c4244ae (patch) | |
| tree | 7b8072a73eb00703e9877f5f20a27169a3d85145 /drivers | |
| parent | 0d69cbb4a932a244ed2d5344b6ef0ccdf99fc8a3 (diff) | |
uwb: init beacon cache entry before registering uwb device
commit 675f0ab2fe5a0f7325208e60b617a5f32b86d72c upstream.
Make sure the uwb_dev->bce entry is set before calling uwb_dev_add in
uwbd_dev_onair so that usermode will only see the device after it is
properly initialized. This fixes a kernel panic that can occur if
usermode tries to access the IEs sysfs attribute of a UWB device before
the driver has had a chance to set the beacon cache entry.
Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/uwb/lc-dev.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/uwb/lc-dev.c b/drivers/uwb/lc-dev.c index 5241f1d0ef7a..3c9e9295f73c 100644 --- a/drivers/uwb/lc-dev.c +++ b/drivers/uwb/lc-dev.c @@ -441,16 +441,19 @@ void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce) uwb_dev->mac_addr = *bce->mac_addr; uwb_dev->dev_addr = bce->dev_addr; dev_set_name(&uwb_dev->dev, macbuf); + + /* plug the beacon cache */ + bce->uwb_dev = uwb_dev; + uwb_dev->bce = bce; + uwb_bce_get(bce); /* released in uwb_dev_sys_release() */ + result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc); if (result < 0) { dev_err(dev, "new device %s: cannot instantiate device\n", macbuf); goto error_dev_add; } - /* plug the beacon cache */ - bce->uwb_dev = uwb_dev; - uwb_dev->bce = bce; - uwb_bce_get(bce); /* released in uwb_dev_sys_release() */ + dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n", macbuf, devbuf, rc->uwb_dev.dev.parent->bus->name, dev_name(rc->uwb_dev.dev.parent)); @@ -458,6 +461,8 @@ void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce) return; error_dev_add: + bce->uwb_dev = NULL; + uwb_bce_put(bce); kfree(uwb_dev); return; } |