Commit 2db61c95 authored Jul 11, 2007 by Fernando Luis Vázquez Cao Committed by Artem Bityutskiy Jul 18, 2007

UBI: cleanup usage of try_module_get



The use of try_module_get(THIS_MODULE) in ubi_get_device_info does not
offer real protection against unexpected driver unloads, since we could
be preempted before try_modules_get gets executed. It is the caller who
should manipulate the refcounts. Besides, ubi_get_device_info is an
exported symbol which guarantees protection when accessed through
symbol_get.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

parent d08c3b78

drivers/mtd/ubi/kapi.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -37,12 +37,8 @@ int ubi_get_device_info(int ubi_num, struct ubi_device_info *di)
		{
		const struct ubi_device *ubi;

		if (!try_module_get(THIS_MODULE))
		return -ENODEV;

		if (ubi_num < 0 \|\| ubi_num >= UBI_MAX_DEVICES \|\|
		!ubi_devices[ubi_num]) {
		module_put(THIS_MODULE);
		return -ENODEV;
		}

		@@ -52,7 +48,6 @@ int ubi_get_device_info(int ubi_num, struct ubi_device_info *di)
		di->min_io_size = ubi->min_io_size;
		di->ro_mode = ubi->ro_mode;
		di->cdev = MKDEV(ubi->major, 0);
		module_put(THIS_MODULE);
		return 0;
		}
		EXPORT_SYMBOL_GPL(ubi_get_device_info);