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[src/trunk]: src/sys/dev Use the localcount(9)-based module_hook mechanism to...
details: https://anonhg.NetBSD.org/src/rev/b7e3b4cc34d0
branches: trunk
changeset: 983831:b7e3b4cc34d0
user: pgoyette <pgoyette%NetBSD.org@localhost>
date: Wed Jun 09 23:22:51 2021 +0000
description:
Use the localcount(9)-based module_hook mechanism to prevent the verbose
modules' code and data being unloaded while in use. Should prevent some
crashes reported by Riastradh@ to occur during suspend/resume operation.
diffstat:
sys/dev/dev_verbose.h | 95 ++++++++++++++++++++++++++++----------------------
1 files changed, 53 insertions(+), 42 deletions(-)
diffs (161 lines):
diff -r bcbc98fbb2cf -r b7e3b4cc34d0 sys/dev/dev_verbose.h
--- a/sys/dev/dev_verbose.h Wed Jun 09 21:09:20 2021 +0000
+++ b/sys/dev/dev_verbose.h Wed Jun 09 23:22:51 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: dev_verbose.h,v 1.5 2021/06/01 22:58:03 riastradh Exp $ */
+/* $NetBSD: dev_verbose.h,v 1.6 2021/06/09 23:22:51 pgoyette Exp $ */
/*
* Redistribution and use in source and binary forms, with or without
@@ -25,6 +25,10 @@
#ifndef _DEV_DEV_VERBOSE_H_
#define _DEV_DEV_VERBOSE_H_
+#ifdef _KERNEL
+#include <sys/module_hook.h>
+#endif
+
const char *dev_findvendor(char *, size_t, const char *, size_t,
const uint16_t *, size_t, uint16_t);
const char *dev_findproduct(char *, size_t, const char *, size_t,
@@ -50,33 +54,34 @@
#ifdef _KERNEL
+#define DEV_VERBOSE_KERNEL_DECLARE(tag) \
+MODULE_HOOK(tag ## _findvendor_hook, const char *, \
+ (char *, size_t, uint16_t)); \
+MODULE_HOOK(tag ## _findproduct_hook, const char *, \
+ (char *, size_t, uint16_t, uint16_t)); \
+extern int tag ## verbose_loaded;
+
#define DEV_VERBOSE_MODULE_DEFINE(tag, deps) \
DEV_VERBOSE_COMMON_DEFINE(tag) \
-extern int tag ## verbose_loaded; \
+DEV_VERBOSE_KERNEL_DECLARE(tag) \
\
static int \
tag ## verbose_modcmd(modcmd_t cmd, void *arg) \
{ \
- static const char *(*saved_findvendor)(char *, size_t, \
- uint16_t); \
- static const char *(*saved_findproduct)(char *, size_t, \
- uint16_t, uint16_t); \
\
switch (cmd) { \
case MODULE_CMD_INIT: \
- saved_findvendor = tag ## _findvendor; \
- saved_findproduct = tag ## _findproduct; \
- tag ## _findvendor = tag ## _findvendor_real; \
- tag ## _findproduct = tag ## _findproduct_real; \
+ MODULE_HOOK_SET(tag ## _findvendor_hook, \
+ tag ## _findvendor_real); \
+ MODULE_HOOK_SET(tag ## _findproduct_hook, \
+ tag ## _findproduct_real); \
tag ## verbose_loaded = 1; \
return 0; \
case MODULE_CMD_FINI: \
- tag ## _findvendor = saved_findvendor; \
- tag ## _findproduct = saved_findproduct; \
tag ## verbose_loaded = 0; \
+ MODULE_HOOK_UNSET(tag ## _findproduct_hook); \
+ MODULE_HOOK_UNSET(tag ## _findvendor_hook); \
return 0; \
- case MODULE_CMD_AUTOUNLOAD: \
- return EBUSY; \
default: \
return ENOTTY; \
} \
@@ -86,11 +91,15 @@
#endif /* KERNEL */
#define DEV_VERBOSE_DECLARE(tag) \
-extern const char * (*tag ## _findvendor)(char *, size_t, uint16_t); \
-extern const char * (*tag ## _findproduct)(char *, size_t, uint16_t, uint16_t)
+extern const char * tag ## _findvendor(char *, size_t, uint16_t); \
+extern const char * tag ## _findproduct(char *, size_t, uint16_t, uint16_t)
#if defined(_KERNEL)
+
#define DEV_VERBOSE_DEFINE(tag) \
+DEV_VERBOSE_KERNEL_DECLARE(tag) \
+struct tag ## _findvendor_hook_t tag ## _findvendor_hook; \
+struct tag ## _findproduct_hook_t tag ## _findproduct_hook; \
int tag ## verbose_loaded = 0; \
\
static void \
@@ -101,46 +110,48 @@
module_autoload(# tag "verbose", MODULE_CLASS_DRIVER); \
} \
\
-static const char * \
-tag ## _findvendor_stub(char *buf, size_t len, uint16_t vendor) \
+const char * \
+tag ## _findvendor(char *buf, size_t len, uint16_t vendor) \
{ \
+ const char *retval = NULL; \
\
tag ## _load_verbose(); \
- if (tag ## verbose_loaded) \
- return tag ## _findvendor(buf, len, vendor); \
- else { \
- snprintf(buf, len, "vendor %4.4x", vendor); \
- return NULL; \
- } \
+ MODULE_HOOK_CALL(tag ## _findvendor_hook, (buf, len, vendor), \
+ {snprintf(buf, len, "vendor %4.4x", vendor); NULL; }, \
+ retval); \
+ return retval; \
} \
\
-static const char * \
-tag ## _findproduct_stub(char *buf, size_t len, uint16_t vendor, \
+const char * \
+tag ## _findproduct(char *buf, size_t len, uint16_t vendor, \
uint16_t product) \
{ \
+ const char *retval = NULL; \
\
tag ## _load_verbose(); \
- if (tag ## verbose_loaded) \
- return tag ## _findproduct(buf, len, vendor, product); \
- else { \
- snprintf(buf, len, "product %4.4x", product); \
- return NULL; \
- } \
+ MODULE_HOOK_CALL(tag ## _findproduct_hook, \
+ (buf, len, vendor, product), \
+ {snprintf(buf, len, "product %4.4x", product); NULL; }, \
+ retval); \
+ return retval; \
} \
- \
-const char *(*tag ## _findvendor)(char *, size_t, uint16_t) = \
- tag ## _findvendor_stub; \
-const char *(*tag ## _findproduct)(char *, size_t, uint16_t, uint16_t) =\
- tag ## _findproduct_stub \
-#else
+#else /* _KERNEL */
#define DEV_VERBOSE_DEFINE(tag) \
DEV_VERBOSE_COMMON_DEFINE(tag) \
-const char *(*tag ## _findvendor)(char *, size_t, uint16_t) = \
- tag ## _findvendor_real; \
-const char *(*tag ## _findproduct)(char *, size_t, uint16_t, uint16_t) =\
- tag ## _findproduct_real \
+const char *tag ## _findvendor(char *buf, size_t len, uint16_t vendor) \
+{ \
+ \
+ return tag ## _findvendor_real(buf, len, vendor); \
+} \
+ \
+const char *tag ## _findproduct(char *buf, size_t len, uint16_t vendor, \
+ uint16_t product) \
+{ \
+ \
+ return tag ## _findproduct_real(buf, len, vendor, product); \
+}
#endif /* _KERNEL */
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