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 <[email protected]>
---
diff -urNp linux-2.6.22-orig/drivers/mtd/ubi/kapi.c linux-2.6.22/drivers/mtd/ubi/kapi.c
--- linux-2.6.22-orig/drivers/mtd/ubi/kapi.c 2007-07-09 08:32:17.000000000 +0900
+++ linux-2.6.22/drivers/mtd/ubi/kapi.c 2007-07-11 16:34:10.000000000 +0900
@@ -37,12 +37,8 @@ int ubi_get_device_info(int ubi_num, str
{
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, str
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);
-
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