Re: [PATCH] media/siano: kill pointless kmutex definitions

From: Davidlohr Bueso
Date: Wed Nov 25 2020 - 23:19:10 EST

ping

On Sun, 01 Nov 2020, Davidlohr Bueso wrote:

Use the mutex api instead of renaming the calls for this
driver.

Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
This was found while auditing mutex semantics in drivers.

drivers/media/common/siano/smscoreapi.c | 42 ++++++++++++------------
drivers/media/common/siano/smscoreapi.h | 5 ---
drivers/media/common/siano/smsdvb-main.c | 14 ++++----
3 files changed, 28 insertions(+), 33 deletions(-)

diff --git a/drivers/media/common/siano/smscoreapi.c b/drivers/media/common/siano/smscoreapi.c
index c1511094fdc7..410cc3ac6f94 100644
--- a/drivers/media/common/siano/smscoreapi.c
+++ b/drivers/media/common/siano/smscoreapi.c
@@ -429,13 +429,13 @@ static struct smscore_registry_entry_t *smscore_find_registry(char *devpath)
struct smscore_registry_entry_t *entry;
struct list_head *next;

- kmutex_lock(&g_smscore_registrylock);
+ mutex_lock(&g_smscore_registrylock);
for (next = g_smscore_registry.next;
next != &g_smscore_registry;
next = next->next) {
entry = (struct smscore_registry_entry_t *) next;
if (!strncmp(entry->devpath, devpath, sizeof(entry->devpath))) {
- kmutex_unlock(&g_smscore_registrylock);
+ mutex_unlock(&g_smscore_registrylock);
return entry;
}
}
@@ -446,7 +446,7 @@ static struct smscore_registry_entry_t *smscore_find_registry(char *devpath)
list_add(&entry->entry, &g_smscore_registry);
} else
pr_err("failed to create smscore_registry.\n");
- kmutex_unlock(&g_smscore_registrylock);
+ mutex_unlock(&g_smscore_registrylock);
return entry;
}

@@ -527,7 +527,7 @@ int smscore_register_hotplug(hotplug_t hotplug)
struct list_head *next, *first;
int rc = 0;

- kmutex_lock(&g_smscore_deviceslock);
+ mutex_lock(&g_smscore_deviceslock);
notifyee = kmalloc(sizeof(*notifyee), GFP_KERNEL);
if (notifyee) {
/* now notify callback about existing devices */
@@ -548,7 +548,7 @@ int smscore_register_hotplug(hotplug_t hotplug)
} else
rc = -ENOMEM;

- kmutex_unlock(&g_smscore_deviceslock);
+ mutex_unlock(&g_smscore_deviceslock);

return rc;
}
@@ -564,7 +564,7 @@ void smscore_unregister_hotplug(hotplug_t hotplug)
{
struct list_head *next, *first;

- kmutex_lock(&g_smscore_deviceslock);
+ mutex_lock(&g_smscore_deviceslock);

first = &g_smscore_notifyees;

@@ -579,7 +579,7 @@ void smscore_unregister_hotplug(hotplug_t hotplug)
}
}

- kmutex_unlock(&g_smscore_deviceslock);
+ mutex_unlock(&g_smscore_deviceslock);
}
EXPORT_SYMBOL_GPL(smscore_unregister_hotplug);

@@ -732,9 +732,9 @@ int smscore_register_device(struct smsdevice_params_t *params,
smscore_registry_settype(dev->devpath, params->device_type);

/* add device to devices list */
- kmutex_lock(&g_smscore_deviceslock);
+ mutex_lock(&g_smscore_deviceslock);
list_add(&dev->entry, &g_smscore_devices);
- kmutex_unlock(&g_smscore_deviceslock);
+ mutex_unlock(&g_smscore_deviceslock);

*coredev = dev;

@@ -890,14 +890,14 @@ int smscore_start_device(struct smscore_device_t *coredev)
return rc;
}

- kmutex_lock(&g_smscore_deviceslock);
+ mutex_lock(&g_smscore_deviceslock);

rc = smscore_notify_callbacks(coredev, coredev->device, 1);
smscore_init_ir(coredev);

pr_debug("device %p started, rc %d\n", coredev, rc);

- kmutex_unlock(&g_smscore_deviceslock);
+ mutex_unlock(&g_smscore_deviceslock);

return rc;
}
@@ -1197,7 +1197,7 @@ void smscore_unregister_device(struct smscore_device_t *coredev)
int num_buffers = 0;
int retry = 0;

- kmutex_lock(&g_smscore_deviceslock);
+ mutex_lock(&g_smscore_deviceslock);

/* Release input device (IR) resources */
sms_ir_exit(coredev);
@@ -1224,9 +1224,9 @@ void smscore_unregister_device(struct smscore_device_t *coredev)

pr_debug("waiting for %d buffer(s)\n",
coredev->num_buffers - num_buffers);
- kmutex_unlock(&g_smscore_deviceslock);
+ mutex_unlock(&g_smscore_deviceslock);
msleep(100);
- kmutex_lock(&g_smscore_deviceslock);
+ mutex_lock(&g_smscore_deviceslock);
}

pr_debug("freed %d buffers\n", num_buffers);
@@ -1245,7 +1245,7 @@ void smscore_unregister_device(struct smscore_device_t *coredev)
list_del(&coredev->entry);
kfree(coredev);

- kmutex_unlock(&g_smscore_deviceslock);
+ mutex_unlock(&g_smscore_deviceslock);

pr_debug("device %p destroyed\n", coredev);
}
@@ -2123,17 +2123,17 @@ static int __init smscore_module_init(void)
{
INIT_LIST_HEAD(&g_smscore_notifyees);
INIT_LIST_HEAD(&g_smscore_devices);
- kmutex_init(&g_smscore_deviceslock);
+ mutex_init(&g_smscore_deviceslock);

INIT_LIST_HEAD(&g_smscore_registry);
- kmutex_init(&g_smscore_registrylock);
+ mutex_init(&g_smscore_registrylock);

return 0;
}

static void __exit smscore_module_exit(void)
{
- kmutex_lock(&g_smscore_deviceslock);
+ mutex_lock(&g_smscore_deviceslock);
while (!list_empty(&g_smscore_notifyees)) {
struct smscore_device_notifyee_t *notifyee =
(struct smscore_device_notifyee_t *)
@@ -2142,9 +2142,9 @@ static void __exit smscore_module_exit(void)
list_del(&notifyee->entry);
kfree(notifyee);
}
- kmutex_unlock(&g_smscore_deviceslock);
+ mutex_unlock(&g_smscore_deviceslock);

- kmutex_lock(&g_smscore_registrylock);
+ mutex_lock(&g_smscore_registrylock);
while (!list_empty(&g_smscore_registry)) {
struct smscore_registry_entry_t *entry =
(struct smscore_registry_entry_t *)
@@ -2153,7 +2153,7 @@ static void __exit smscore_module_exit(void)
list_del(&entry->entry);
kfree(entry);
}
- kmutex_unlock(&g_smscore_registrylock);
+ mutex_unlock(&g_smscore_registrylock);

pr_debug("\n");
}
diff --git a/drivers/media/common/siano/smscoreapi.h b/drivers/media/common/siano/smscoreapi.h
index b3b793b5caf3..4a6b9f4c44ac 100644
--- a/drivers/media/common/siano/smscoreapi.h
+++ b/drivers/media/common/siano/smscoreapi.h
@@ -28,11 +28,6 @@ Copyright (C) 2006-2008, Uri Shkolnik, Anatoly Greenblat

#include "smsir.h"

-#define kmutex_init(_p_) mutex_init(_p_)
-#define kmutex_lock(_p_) mutex_lock(_p_)
-#define kmutex_trylock(_p_) mutex_trylock(_p_)
-#define kmutex_unlock(_p_) mutex_unlock(_p_)
-
/*
* Define the firmware names used by the driver.
* Those should match what's used at smscoreapi.c and sms-cards.c
diff --git a/drivers/media/common/siano/smsdvb-main.c b/drivers/media/common/siano/smsdvb-main.c
index 88f90dfd368b..633902036e30 100644
--- a/drivers/media/common/siano/smsdvb-main.c
+++ b/drivers/media/common/siano/smsdvb-main.c
@@ -630,11 +630,11 @@ static void smsdvb_unregister_client(struct smsdvb_client_t *client)

static void smsdvb_onremove(void *context)
{
- kmutex_lock(&g_smsdvb_clientslock);
+ mutex_lock(&g_smsdvb_clientslock);

smsdvb_unregister_client((struct smsdvb_client_t *) context);

- kmutex_unlock(&g_smsdvb_clientslock);
+ mutex_unlock(&g_smsdvb_clientslock);
}

static int smsdvb_start_feed(struct dvb_demux_feed *feed)
@@ -1151,11 +1151,11 @@ static int smsdvb_hotplug(struct smscore_device_t *coredev,
init_completion(&client->tune_done);
init_completion(&client->stats_done);

- kmutex_lock(&g_smsdvb_clientslock);
+ mutex_lock(&g_smsdvb_clientslock);

list_add(&client->entry, &g_smsdvb_clients);

- kmutex_unlock(&g_smsdvb_clientslock);
+ mutex_unlock(&g_smsdvb_clientslock);

client->event_fe_state = -1;
client->event_unc_state = -1;
@@ -1198,7 +1198,7 @@ static int __init smsdvb_module_init(void)
int rc;

INIT_LIST_HEAD(&g_smsdvb_clients);
- kmutex_init(&g_smsdvb_clientslock);
+ mutex_init(&g_smsdvb_clientslock);

smsdvb_debugfs_register();

@@ -1213,14 +1213,14 @@ static void __exit smsdvb_module_exit(void)
{
smscore_unregister_hotplug(smsdvb_hotplug);

- kmutex_lock(&g_smsdvb_clientslock);
+ mutex_lock(&g_smsdvb_clientslock);

while (!list_empty(&g_smsdvb_clients))
smsdvb_unregister_client((struct smsdvb_client_t *)g_smsdvb_clients.next);

smsdvb_debugfs_unregister();

- kmutex_unlock(&g_smsdvb_clientslock);
+ mutex_unlock(&g_smsdvb_clientslock);
}

module_init(smsdvb_module_init);
--
2.26.2