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-rw-r--r--include/linux/kmod.h11
-rw-r--r--kernel/kmod.c10
2 files changed, 14 insertions, 7 deletions
diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index 92213a9..d5fa565 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -29,10 +29,15 @@
#ifdef CONFIG_MODULES
/* modprobe exit status on success, -ve on error. Return value
* usually useless though. */
-extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
-#define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))
+extern int __request_module(bool wait, const char *name, ...) \
+ __attribute__((format(printf, 2, 3)));
+#define request_module(mod...) __request_module(true, mod)
+#define request_module_nowait(mod...) __request_module(false, mod)
+#define try_then_request_module(x, mod...) \
+ ((x) ?: (__request_module(false, mod), (x)))
#else
-static inline int request_module(const char * name, ...) { return -ENOSYS; }
+static inline int request_module(const char *name, ...) { return -ENOSYS; }
+static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; }
#define try_then_request_module(x, mod...) (x)
#endif
diff --git a/kernel/kmod.c b/kernel/kmod.c
index f0c8f54..b750675 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -50,7 +50,8 @@ static struct workqueue_struct *khelper_wq;
char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
/**
- * request_module - try to load a kernel module
+ * __request_module - try to load a kernel module
+ * @wait: wait (or not) for the operation to complete
* @fmt: printf style format string for the name of the module
* @...: arguments as specified in the format string
*
@@ -63,7 +64,7 @@ char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
* If module auto-loading support is disabled then this function
* becomes a no-operation.
*/
-int request_module(const char *fmt, ...)
+int __request_module(bool wait, const char *fmt, ...)
{
va_list args;
char module_name[MODULE_NAME_LEN];
@@ -108,11 +109,12 @@ int request_module(const char *fmt, ...)
return -ENOMEM;
}
- ret = call_usermodehelper(modprobe_path, argv, envp, 1);
+ ret = call_usermodehelper(modprobe_path, argv, envp,
+ wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC);
atomic_dec(&kmod_concurrent);
return ret;
}
-EXPORT_SYMBOL(request_module);
+EXPORT_SYMBOL(__request_module);
#endif /* CONFIG_MODULES */
struct subprocess_info {
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