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| author | Sergey Klyaus <Sergey.Klyaus@tune-it.ru> | 2014-10-08 11:31:54 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-07 11:14:57 -0800 |
| commit | 0cd75047de7f54d6fb4aba0ec5818f8194815a5a (patch) | |
| tree | 32fd93ff2934eef026907e747ee6fe6456785687 /drivers/base | |
| parent | 4ef67a8c95f32ed0c8c6ed5fe01d1dd16358350e (diff) | |
| download | linux-0cd75047de7f54d6fb4aba0ec5818f8194815a5a.tar.gz linux-0cd75047de7f54d6fb4aba0ec5818f8194815a5a.tar.bz2 linux-0cd75047de7f54d6fb4aba0ec5818f8194815a5a.zip | |
driver core: fix race with userland in device_add()
bus_add_device() should be called before devtmpfs_create_node(), so when
userland application opens device from devtmpfs, it wouldn't get ENODEV
from kernel, because device_add() wasn't completed.
Signed-off-by: Sergey Klyaus <Sergey.Klyaus@Tune-IT.Ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/core.c | 38 |
1 files changed, 18 insertions, 20 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 14d162952c3b..00ec7ce6f3e3 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1019,18 +1019,6 @@ int device_add(struct device *dev) if (error) goto attrError; - if (MAJOR(dev->devt)) { - error = device_create_file(dev, &dev_attr_dev); - if (error) - goto ueventattrError; - - error = device_create_sys_dev_entry(dev); - if (error) - goto devtattrError; - - devtmpfs_create_node(dev); - } - error = device_add_class_symlinks(dev); if (error) goto SymlinkError; @@ -1045,6 +1033,18 @@ int device_add(struct device *dev) goto DPMError; device_pm_add(dev); + if (MAJOR(dev->devt)) { + error = device_create_file(dev, &dev_attr_dev); + if (error) + goto DevAttrError; + + error = device_create_sys_dev_entry(dev); + if (error) + goto SysEntryError; + + devtmpfs_create_node(dev); + } + /* Notify clients of device addition. This call must come * after dpm_sysfs_add() and before kobject_uevent(). */ @@ -1074,6 +1074,12 @@ int device_add(struct device *dev) done: put_device(dev); return error; + SysEntryError: + if (MAJOR(dev->devt)) + device_remove_file(dev, &dev_attr_dev); + DevAttrError: + device_pm_remove(dev); + dpm_sysfs_remove(dev); DPMError: bus_remove_device(dev); BusError: @@ -1081,14 +1087,6 @@ done: AttrsError: device_remove_class_symlinks(dev); SymlinkError: - if (MAJOR(dev->devt)) - devtmpfs_delete_node(dev); - if (MAJOR(dev->devt)) - device_remove_sys_dev_entry(dev); - devtattrError: - if (MAJOR(dev->devt)) - device_remove_file(dev, &dev_attr_dev); - ueventattrError: device_remove_file(dev, &dev_attr_uevent); attrError: kobject_uevent(&dev->kobj, KOBJ_REMOVE); |