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From: Mauro Carvalho Chehab <mchehab@kernel.org>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"David Airlie" <airlied@linux.ie>,
	"Greg KH" <gregkh@linuxfoundation.org>,
	"Jaroslav Kysela" <perex@perex.cz>,
	"Kai Vehmanen" <kai.vehmanen@intel.com>,
	"Lucas De Marchi" <lucas.demarchi@intel.com>,
	"Pierre-Louis Bossart" <pierre-louis.bossart@intel.com>,
	"Takashi Iwai" <tiwai@suse.com>,
	alsa-devel@alsa-project.org, dri-devel@lists.freedesktop.org,
	intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	linux-modules@vger.kernel.org, mauro.chehab@linux.intel.com,
	Dan Williams <dan.j.williams@intel.com>
Subject: [PATCH v5 1/2] module: update dependencies at try_module_get()
Date: Sat, 30 Apr 2022 21:04:54 +0100	[thread overview]
Message-ID: <ad2a9fe66cf502e2e2e2325f1f04d0fae36aa82b.1651348913.git.mchehab@kernel.org> (raw)
In-Reply-To: <cover.1651348913.git.mchehab@kernel.org>

Sometimes, device drivers are bound into each other via try_module_get(),
making such references invisible when looking at /proc/modules or lsmod.

Add a function to allow setting up module references for such
cases, and call it when try_module_get() is used.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
---

See [PATCH v5 0/2] at: https://lore.kernel.org/all/cover.1651348913.git.mchehab@kernel.org/

 include/linux/module.h |  8 ++++--
 kernel/module/main.c   | 65 +++++++++++++++++++++++++++++++++---------
 2 files changed, 56 insertions(+), 17 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index 46d4d5f2516e..3d9d38c426b4 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -620,12 +620,12 @@ extern void __module_get(struct module *module);
 
 /* This is the Right Way to get a module: if it fails, it's being removed,
  * so pretend it's not there. */
-extern bool try_module_get(struct module *module);
+extern bool try_module_get_owner(struct module *module, struct module *this);
 
 extern void module_put(struct module *module);
 
 #else /*!CONFIG_MODULE_UNLOAD*/
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return !module || module_is_live(module);
 }
@@ -740,7 +740,7 @@ static inline void __module_get(struct module *module)
 {
 }
 
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return true;
 }
@@ -875,6 +875,8 @@ static inline bool module_sig_ok(struct module *module)
 }
 #endif	/* CONFIG_MODULE_SIG */
 
+#define try_module_get(mod) try_module_get_owner(mod, THIS_MODULE)
+
 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 					     struct module *, unsigned long),
 				   void *data);
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 05a42d8fcd7a..218c4308bb7a 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -150,6 +150,24 @@ int unregister_module_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
+static bool __try_module_get(struct module *module)
+{
+	bool ret = true;
+
+	if (module) {
+		preempt_disable();
+		/* Note: here, we can fail to get a reference */
+		if (likely(module_is_live(module) &&
+			   atomic_inc_not_zero(&module->refcnt) != 0))
+			trace_module_get(module, _RET_IP_);
+		else
+			ret = false;
+
+		preempt_enable();
+	}
+	return ret;
+}
+
 /*
  * We require a truly strong try_module_get(): 0 means success.
  * Otherwise an error is returned due to ongoing or failed
@@ -160,7 +178,7 @@ static inline int strong_try_module_get(struct module *mod)
 	BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
 	if (mod && mod->state == MODULE_STATE_COMING)
 		return -EBUSY;
-	if (try_module_get(mod))
+	if (__try_module_get(mod))
 		return 0;
 	else
 		return -ENOENT;
@@ -631,6 +649,33 @@ static int ref_module(struct module *a, struct module *b)
 	return 0;
 }
 
+static int ref_module_dependency(struct module *mod, struct module *this)
+{
+	int ret;
+
+	if (!this || !this->name)
+		return -EINVAL;
+
+	if (mod == this)
+		return 0;
+
+	mutex_lock(&module_mutex);
+
+	ret = ref_module(this, mod);
+
+#ifdef CONFIG_MODULE_UNLOAD
+	if (ret)
+		goto ret;
+
+	ret = sysfs_create_link(mod->holders_dir,
+				&this->mkobj.kobj, this->name);
+#endif
+
+ret:
+	mutex_unlock(&module_mutex);
+	return ret;
+}
+
 /* Clear the unload stuff of the module. */
 static void module_unload_free(struct module *mod)
 {
@@ -841,24 +886,16 @@ void __module_get(struct module *module)
 }
 EXPORT_SYMBOL(__module_get);
 
-bool try_module_get(struct module *module)
+bool try_module_get_owner(struct module *module, struct module *this)
 {
-	bool ret = true;
+	int ret = __try_module_get(module);
 
-	if (module) {
-		preempt_disable();
-		/* Note: here, we can fail to get a reference */
-		if (likely(module_is_live(module) &&
-			   atomic_inc_not_zero(&module->refcnt) != 0))
-			trace_module_get(module, _RET_IP_);
-		else
-			ret = false;
+	if (ret)
+		ref_module_dependency(module, this);
 
-		preempt_enable();
-	}
 	return ret;
 }
-EXPORT_SYMBOL(try_module_get);
+EXPORT_SYMBOL(try_module_get_owner);
 
 void module_put(struct module *module)
 {
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: Mauro Carvalho Chehab <mchehab@kernel.org>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: alsa-devel@alsa-project.org, mauro.chehab@linux.intel.com,
	David Airlie <airlied@linux.ie>,
	Greg KH <gregkh@linuxfoundation.org>,
	intel-gfx@lists.freedesktop.org,
	Lucas De Marchi <lucas.demarchi@intel.com>,
	Takashi Iwai <tiwai@suse.com>,
	dri-devel@lists.freedesktop.org, Jaroslav Kysela <perex@perex.cz>,
	Kai Vehmanen <kai.vehmanen@intel.com>,
	linux-modules@vger.kernel.org,
	Dan Williams <dan.j.williams@intel.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-kernel@vger.kernel.org,
	Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
Subject: [PATCH v5 1/2] module: update dependencies at try_module_get()
Date: Sat, 30 Apr 2022 21:04:54 +0100	[thread overview]
Message-ID: <ad2a9fe66cf502e2e2e2325f1f04d0fae36aa82b.1651348913.git.mchehab@kernel.org> (raw)
In-Reply-To: <cover.1651348913.git.mchehab@kernel.org>

Sometimes, device drivers are bound into each other via try_module_get(),
making such references invisible when looking at /proc/modules or lsmod.

Add a function to allow setting up module references for such
cases, and call it when try_module_get() is used.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
---

See [PATCH v5 0/2] at: https://lore.kernel.org/all/cover.1651348913.git.mchehab@kernel.org/

 include/linux/module.h |  8 ++++--
 kernel/module/main.c   | 65 +++++++++++++++++++++++++++++++++---------
 2 files changed, 56 insertions(+), 17 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index 46d4d5f2516e..3d9d38c426b4 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -620,12 +620,12 @@ extern void __module_get(struct module *module);
 
 /* This is the Right Way to get a module: if it fails, it's being removed,
  * so pretend it's not there. */
-extern bool try_module_get(struct module *module);
+extern bool try_module_get_owner(struct module *module, struct module *this);
 
 extern void module_put(struct module *module);
 
 #else /*!CONFIG_MODULE_UNLOAD*/
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return !module || module_is_live(module);
 }
@@ -740,7 +740,7 @@ static inline void __module_get(struct module *module)
 {
 }
 
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return true;
 }
@@ -875,6 +875,8 @@ static inline bool module_sig_ok(struct module *module)
 }
 #endif	/* CONFIG_MODULE_SIG */
 
+#define try_module_get(mod) try_module_get_owner(mod, THIS_MODULE)
+
 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 					     struct module *, unsigned long),
 				   void *data);
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 05a42d8fcd7a..218c4308bb7a 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -150,6 +150,24 @@ int unregister_module_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
+static bool __try_module_get(struct module *module)
+{
+	bool ret = true;
+
+	if (module) {
+		preempt_disable();
+		/* Note: here, we can fail to get a reference */
+		if (likely(module_is_live(module) &&
+			   atomic_inc_not_zero(&module->refcnt) != 0))
+			trace_module_get(module, _RET_IP_);
+		else
+			ret = false;
+
+		preempt_enable();
+	}
+	return ret;
+}
+
 /*
  * We require a truly strong try_module_get(): 0 means success.
  * Otherwise an error is returned due to ongoing or failed
@@ -160,7 +178,7 @@ static inline int strong_try_module_get(struct module *mod)
 	BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
 	if (mod && mod->state == MODULE_STATE_COMING)
 		return -EBUSY;
-	if (try_module_get(mod))
+	if (__try_module_get(mod))
 		return 0;
 	else
 		return -ENOENT;
@@ -631,6 +649,33 @@ static int ref_module(struct module *a, struct module *b)
 	return 0;
 }
 
+static int ref_module_dependency(struct module *mod, struct module *this)
+{
+	int ret;
+
+	if (!this || !this->name)
+		return -EINVAL;
+
+	if (mod == this)
+		return 0;
+
+	mutex_lock(&module_mutex);
+
+	ret = ref_module(this, mod);
+
+#ifdef CONFIG_MODULE_UNLOAD
+	if (ret)
+		goto ret;
+
+	ret = sysfs_create_link(mod->holders_dir,
+				&this->mkobj.kobj, this->name);
+#endif
+
+ret:
+	mutex_unlock(&module_mutex);
+	return ret;
+}
+
 /* Clear the unload stuff of the module. */
 static void module_unload_free(struct module *mod)
 {
@@ -841,24 +886,16 @@ void __module_get(struct module *module)
 }
 EXPORT_SYMBOL(__module_get);
 
-bool try_module_get(struct module *module)
+bool try_module_get_owner(struct module *module, struct module *this)
 {
-	bool ret = true;
+	int ret = __try_module_get(module);
 
-	if (module) {
-		preempt_disable();
-		/* Note: here, we can fail to get a reference */
-		if (likely(module_is_live(module) &&
-			   atomic_inc_not_zero(&module->refcnt) != 0))
-			trace_module_get(module, _RET_IP_);
-		else
-			ret = false;
+	if (ret)
+		ref_module_dependency(module, this);
 
-		preempt_enable();
-	}
 	return ret;
 }
-EXPORT_SYMBOL(try_module_get);
+EXPORT_SYMBOL(try_module_get_owner);
 
 void module_put(struct module *module)
 {
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: Mauro Carvalho Chehab <mchehab@kernel.org>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: alsa-devel@alsa-project.org, mauro.chehab@linux.intel.com,
	David Airlie <airlied@linux.ie>,
	Greg KH <gregkh@linuxfoundation.org>,
	intel-gfx@lists.freedesktop.org,
	Lucas De Marchi <lucas.demarchi@intel.com>,
	Takashi Iwai <tiwai@suse.com>,
	dri-devel@lists.freedesktop.org, Jaroslav Kysela <perex@perex.cz>,
	Kai Vehmanen <kai.vehmanen@intel.com>,
	linux-modules@vger.kernel.org,
	Dan Williams <dan.j.williams@intel.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-kernel@vger.kernel.org,
	Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
Subject: [Intel-gfx] [PATCH v5 1/2] module: update dependencies at try_module_get()
Date: Sat, 30 Apr 2022 21:04:54 +0100	[thread overview]
Message-ID: <ad2a9fe66cf502e2e2e2325f1f04d0fae36aa82b.1651348913.git.mchehab@kernel.org> (raw)
In-Reply-To: <cover.1651348913.git.mchehab@kernel.org>

Sometimes, device drivers are bound into each other via try_module_get(),
making such references invisible when looking at /proc/modules or lsmod.

Add a function to allow setting up module references for such
cases, and call it when try_module_get() is used.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
---

See [PATCH v5 0/2] at: https://lore.kernel.org/all/cover.1651348913.git.mchehab@kernel.org/

 include/linux/module.h |  8 ++++--
 kernel/module/main.c   | 65 +++++++++++++++++++++++++++++++++---------
 2 files changed, 56 insertions(+), 17 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index 46d4d5f2516e..3d9d38c426b4 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -620,12 +620,12 @@ extern void __module_get(struct module *module);
 
 /* This is the Right Way to get a module: if it fails, it's being removed,
  * so pretend it's not there. */
-extern bool try_module_get(struct module *module);
+extern bool try_module_get_owner(struct module *module, struct module *this);
 
 extern void module_put(struct module *module);
 
 #else /*!CONFIG_MODULE_UNLOAD*/
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return !module || module_is_live(module);
 }
@@ -740,7 +740,7 @@ static inline void __module_get(struct module *module)
 {
 }
 
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return true;
 }
@@ -875,6 +875,8 @@ static inline bool module_sig_ok(struct module *module)
 }
 #endif	/* CONFIG_MODULE_SIG */
 
+#define try_module_get(mod) try_module_get_owner(mod, THIS_MODULE)
+
 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 					     struct module *, unsigned long),
 				   void *data);
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 05a42d8fcd7a..218c4308bb7a 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -150,6 +150,24 @@ int unregister_module_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
+static bool __try_module_get(struct module *module)
+{
+	bool ret = true;
+
+	if (module) {
+		preempt_disable();
+		/* Note: here, we can fail to get a reference */
+		if (likely(module_is_live(module) &&
+			   atomic_inc_not_zero(&module->refcnt) != 0))
+			trace_module_get(module, _RET_IP_);
+		else
+			ret = false;
+
+		preempt_enable();
+	}
+	return ret;
+}
+
 /*
  * We require a truly strong try_module_get(): 0 means success.
  * Otherwise an error is returned due to ongoing or failed
@@ -160,7 +178,7 @@ static inline int strong_try_module_get(struct module *mod)
 	BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
 	if (mod && mod->state == MODULE_STATE_COMING)
 		return -EBUSY;
-	if (try_module_get(mod))
+	if (__try_module_get(mod))
 		return 0;
 	else
 		return -ENOENT;
@@ -631,6 +649,33 @@ static int ref_module(struct module *a, struct module *b)
 	return 0;
 }
 
+static int ref_module_dependency(struct module *mod, struct module *this)
+{
+	int ret;
+
+	if (!this || !this->name)
+		return -EINVAL;
+
+	if (mod == this)
+		return 0;
+
+	mutex_lock(&module_mutex);
+
+	ret = ref_module(this, mod);
+
+#ifdef CONFIG_MODULE_UNLOAD
+	if (ret)
+		goto ret;
+
+	ret = sysfs_create_link(mod->holders_dir,
+				&this->mkobj.kobj, this->name);
+#endif
+
+ret:
+	mutex_unlock(&module_mutex);
+	return ret;
+}
+
 /* Clear the unload stuff of the module. */
 static void module_unload_free(struct module *mod)
 {
@@ -841,24 +886,16 @@ void __module_get(struct module *module)
 }
 EXPORT_SYMBOL(__module_get);
 
-bool try_module_get(struct module *module)
+bool try_module_get_owner(struct module *module, struct module *this)
 {
-	bool ret = true;
+	int ret = __try_module_get(module);
 
-	if (module) {
-		preempt_disable();
-		/* Note: here, we can fail to get a reference */
-		if (likely(module_is_live(module) &&
-			   atomic_inc_not_zero(&module->refcnt) != 0))
-			trace_module_get(module, _RET_IP_);
-		else
-			ret = false;
+	if (ret)
+		ref_module_dependency(module, this);
 
-		preempt_enable();
-	}
 	return ret;
 }
-EXPORT_SYMBOL(try_module_get);
+EXPORT_SYMBOL(try_module_get_owner);
 
 void module_put(struct module *module)
 {
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: Mauro Carvalho Chehab <mchehab@kernel.org>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: alsa-devel@alsa-project.org, mauro.chehab@linux.intel.com,
	David Airlie <airlied@linux.ie>,
	Greg KH <gregkh@linuxfoundation.org>,
	intel-gfx@lists.freedesktop.org,
	Lucas De Marchi <lucas.demarchi@intel.com>,
	Takashi Iwai <tiwai@suse.com>,
	dri-devel@lists.freedesktop.org,
	Kai Vehmanen <kai.vehmanen@intel.com>,
	linux-modules@vger.kernel.org, Daniel Vetter <daniel@ffwll.ch>,
	Dan Williams <dan.j.williams@intel.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-kernel@vger.kernel.org,
	Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
Subject: [PATCH v5 1/2] module: update dependencies at try_module_get()
Date: Sat, 30 Apr 2022 21:04:54 +0100	[thread overview]
Message-ID: <ad2a9fe66cf502e2e2e2325f1f04d0fae36aa82b.1651348913.git.mchehab@kernel.org> (raw)
In-Reply-To: <cover.1651348913.git.mchehab@kernel.org>

Sometimes, device drivers are bound into each other via try_module_get(),
making such references invisible when looking at /proc/modules or lsmod.

Add a function to allow setting up module references for such
cases, and call it when try_module_get() is used.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
---

See [PATCH v5 0/2] at: https://lore.kernel.org/all/cover.1651348913.git.mchehab@kernel.org/

 include/linux/module.h |  8 ++++--
 kernel/module/main.c   | 65 +++++++++++++++++++++++++++++++++---------
 2 files changed, 56 insertions(+), 17 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index 46d4d5f2516e..3d9d38c426b4 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -620,12 +620,12 @@ extern void __module_get(struct module *module);
 
 /* This is the Right Way to get a module: if it fails, it's being removed,
  * so pretend it's not there. */
-extern bool try_module_get(struct module *module);
+extern bool try_module_get_owner(struct module *module, struct module *this);
 
 extern void module_put(struct module *module);
 
 #else /*!CONFIG_MODULE_UNLOAD*/
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return !module || module_is_live(module);
 }
@@ -740,7 +740,7 @@ static inline void __module_get(struct module *module)
 {
 }
 
-static inline bool try_module_get(struct module *module)
+static inline bool try_module_get_owner(struct module *module, struct module *this)
 {
 	return true;
 }
@@ -875,6 +875,8 @@ static inline bool module_sig_ok(struct module *module)
 }
 #endif	/* CONFIG_MODULE_SIG */
 
+#define try_module_get(mod) try_module_get_owner(mod, THIS_MODULE)
+
 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 					     struct module *, unsigned long),
 				   void *data);
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 05a42d8fcd7a..218c4308bb7a 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -150,6 +150,24 @@ int unregister_module_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
+static bool __try_module_get(struct module *module)
+{
+	bool ret = true;
+
+	if (module) {
+		preempt_disable();
+		/* Note: here, we can fail to get a reference */
+		if (likely(module_is_live(module) &&
+			   atomic_inc_not_zero(&module->refcnt) != 0))
+			trace_module_get(module, _RET_IP_);
+		else
+			ret = false;
+
+		preempt_enable();
+	}
+	return ret;
+}
+
 /*
  * We require a truly strong try_module_get(): 0 means success.
  * Otherwise an error is returned due to ongoing or failed
@@ -160,7 +178,7 @@ static inline int strong_try_module_get(struct module *mod)
 	BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
 	if (mod && mod->state == MODULE_STATE_COMING)
 		return -EBUSY;
-	if (try_module_get(mod))
+	if (__try_module_get(mod))
 		return 0;
 	else
 		return -ENOENT;
@@ -631,6 +649,33 @@ static int ref_module(struct module *a, struct module *b)
 	return 0;
 }
 
+static int ref_module_dependency(struct module *mod, struct module *this)
+{
+	int ret;
+
+	if (!this || !this->name)
+		return -EINVAL;
+
+	if (mod == this)
+		return 0;
+
+	mutex_lock(&module_mutex);
+
+	ret = ref_module(this, mod);
+
+#ifdef CONFIG_MODULE_UNLOAD
+	if (ret)
+		goto ret;
+
+	ret = sysfs_create_link(mod->holders_dir,
+				&this->mkobj.kobj, this->name);
+#endif
+
+ret:
+	mutex_unlock(&module_mutex);
+	return ret;
+}
+
 /* Clear the unload stuff of the module. */
 static void module_unload_free(struct module *mod)
 {
@@ -841,24 +886,16 @@ void __module_get(struct module *module)
 }
 EXPORT_SYMBOL(__module_get);
 
-bool try_module_get(struct module *module)
+bool try_module_get_owner(struct module *module, struct module *this)
 {
-	bool ret = true;
+	int ret = __try_module_get(module);
 
-	if (module) {
-		preempt_disable();
-		/* Note: here, we can fail to get a reference */
-		if (likely(module_is_live(module) &&
-			   atomic_inc_not_zero(&module->refcnt) != 0))
-			trace_module_get(module, _RET_IP_);
-		else
-			ret = false;
+	if (ret)
+		ref_module_dependency(module, this);
 
-		preempt_enable();
-	}
 	return ret;
 }
-EXPORT_SYMBOL(try_module_get);
+EXPORT_SYMBOL(try_module_get_owner);
 
 void module_put(struct module *module)
 {
-- 
2.35.1


  reply	other threads:[~2022-04-30 20:05 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-30 20:04 [PATCH v5 0/2] Let userspace know when snd-hda-intel needs i915 Mauro Carvalho Chehab
2022-04-30 20:04 ` Mauro Carvalho Chehab
2022-04-30 20:04 ` [Intel-gfx] " Mauro Carvalho Chehab
2022-04-30 20:04 ` Mauro Carvalho Chehab
2022-04-30 20:04 ` Mauro Carvalho Chehab [this message]
2022-04-30 20:04   ` [PATCH v5 1/2] module: update dependencies at try_module_get() Mauro Carvalho Chehab
2022-04-30 20:04   ` [Intel-gfx] " Mauro Carvalho Chehab
2022-04-30 20:04   ` Mauro Carvalho Chehab
2022-05-02  6:08   ` Christophe Leroy
2022-05-02  6:08     ` [Intel-gfx] " Christophe Leroy
2022-05-02  6:08     ` Christophe Leroy
2022-05-02  6:08     ` Christophe Leroy
2022-05-05 21:35   ` [Intel-gfx] " Andi Shyti
2022-05-05 21:35     ` Andi Shyti
2022-05-09 16:56     ` Mauro Carvalho Chehab
2022-05-09 16:56       ` Mauro Carvalho Chehab
2022-05-09 16:56       ` Mauro Carvalho Chehab
2022-04-30 20:04 ` [PATCH v5 2/2] ALSA: hda - identify when audio is provided by a video driver Mauro Carvalho Chehab
2022-04-30 20:04   ` Mauro Carvalho Chehab
2022-04-30 20:04   ` [Intel-gfx] " Mauro Carvalho Chehab
2022-04-30 20:04   ` Mauro Carvalho Chehab
2022-05-09  8:48   ` Takashi Iwai
2022-05-09  8:48     ` Takashi Iwai
2022-05-09  8:48     ` Takashi Iwai
2022-05-09  8:48     ` [Intel-gfx] " Takashi Iwai
2022-04-30 20:21 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for Let userspace know when snd-hda-intel needs i915 Patchwork
2022-04-30 20:51 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2022-04-30 22:42 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork

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