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Subject[PATCH 15/16] staging: vchiq_arm: fix open/release cdev functions
Date
Both functions checked the minor number of the cdev prior running the
code. This was useless since the number of devices is already limited by
alloc_chrdev_region.

This removes the check and reindents the code where relevant.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
.../interface/vchiq_arm/vchiq_arm.c | 247 +++++++-----------
1 file changed, 100 insertions(+), 147 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index a7dcced79980..153a396d21bd 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -63,8 +63,6 @@
#undef MODULE_PARAM_PREFIX
#define MODULE_PARAM_PREFIX DEVICE_NAME "."

-#define VCHIQ_MINOR 0
-
/* Some per-instance constants */
#define MAX_COMPLETIONS 128
#define MAX_SERVICES 64
@@ -1950,195 +1948,150 @@ vchiq_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

#endif

-/****************************************************************************
-*
-* vchiq_open
-*
-***************************************************************************/
-
-static int
-vchiq_open(struct inode *inode, struct file *file)
+static int vchiq_open(struct inode *inode, struct file *file)
{
- int dev = iminor(inode) & 0x0f;
+ VCHIQ_STATE_T *state = vchiq_get_state();
+ VCHIQ_INSTANCE_T instance;

vchiq_log_info(vchiq_arm_log_level, "vchiq_open");
- switch (dev) {
- case VCHIQ_MINOR: {
- VCHIQ_STATE_T *state = vchiq_get_state();
- VCHIQ_INSTANCE_T instance;

- if (!state) {
- vchiq_log_error(vchiq_arm_log_level,
+ if (!state) {
+ vchiq_log_error(vchiq_arm_log_level,
"vchiq has no connection to VideoCore");
- return -ENOTCONN;
- }
-
- instance = kzalloc(sizeof(*instance), GFP_KERNEL);
- if (!instance)
- return -ENOMEM;
+ return -ENOTCONN;
+ }

- instance->state = state;
- instance->pid = current->tgid;
+ instance = kzalloc(sizeof(*instance), GFP_KERNEL);
+ if (!instance)
+ return -ENOMEM;

- vchiq_debugfs_add_instance(instance);
+ instance->state = state;
+ instance->pid = current->tgid;

- init_completion(&instance->insert_event);
- init_completion(&instance->remove_event);
- mutex_init(&instance->completion_mutex);
- mutex_init(&instance->bulk_waiter_list_mutex);
- INIT_LIST_HEAD(&instance->bulk_waiter_list);
+ vchiq_debugfs_add_instance(instance);

- file->private_data = instance;
- } break;
+ init_completion(&instance->insert_event);
+ init_completion(&instance->remove_event);
+ mutex_init(&instance->completion_mutex);
+ mutex_init(&instance->bulk_waiter_list_mutex);
+ INIT_LIST_HEAD(&instance->bulk_waiter_list);

- default:
- vchiq_log_error(vchiq_arm_log_level,
- "Unknown minor device: %d", dev);
- return -ENXIO;
- }
+ file->private_data = instance;

return 0;
}

-/****************************************************************************
-*
-* vchiq_release
-*
-***************************************************************************/
-
-static int
-vchiq_release(struct inode *inode, struct file *file)
+static int vchiq_release(struct inode *inode, struct file *file)
{
- int dev = iminor(inode) & 0x0f;
+ VCHIQ_INSTANCE_T instance = file->private_data;
+ VCHIQ_STATE_T *state = vchiq_get_state();
+ VCHIQ_SERVICE_T *service;
int ret = 0;
+ int i;

- switch (dev) {
- case VCHIQ_MINOR: {
- VCHIQ_INSTANCE_T instance = file->private_data;
- VCHIQ_STATE_T *state = vchiq_get_state();
- VCHIQ_SERVICE_T *service;
- int i;
+ vchiq_log_info(vchiq_arm_log_level, "%s: instance=%lx", __func__,
+ (unsigned long)instance);

- vchiq_log_info(vchiq_arm_log_level,
- "%s: instance=%lx",
- __func__, (unsigned long)instance);
+ if (!state) {
+ ret = -EPERM;
+ goto out;
+ }

- if (!state) {
- ret = -EPERM;
- goto out;
- }
+ /* Ensure videocore is awake to allow termination. */
+ vchiq_use_internal(instance->state, NULL, USE_TYPE_VCHIQ);

- /* Ensure videocore is awake to allow termination. */
- vchiq_use_internal(instance->state, NULL,
- USE_TYPE_VCHIQ);
+ mutex_lock(&instance->completion_mutex);

- mutex_lock(&instance->completion_mutex);
+ /* Wake the completion thread and ask it to exit */
+ instance->closing = 1;
+ complete(&instance->insert_event);

- /* Wake the completion thread and ask it to exit */
- instance->closing = 1;
- complete(&instance->insert_event);
+ mutex_unlock(&instance->completion_mutex);

- mutex_unlock(&instance->completion_mutex);
+ /* Wake the slot handler if the completion queue is full. */
+ complete(&instance->remove_event);

- /* Wake the slot handler if the completion queue is full. */
- complete(&instance->remove_event);
+ /* Mark all services for termination... */
+ i = 0;
+ while ((service = next_service_by_instance(state, instance, &i))) {
+ USER_SERVICE_T *user_service = service->base.userdata;

- /* Mark all services for termination... */
- i = 0;
- while ((service = next_service_by_instance(state, instance,
- &i)) != NULL) {
- USER_SERVICE_T *user_service = service->base.userdata;
+ /* Wake the slot handler if the msg queue is full. */
+ complete(&user_service->remove_event);

- /* Wake the slot handler if the msg queue is full. */
- complete(&user_service->remove_event);
+ vchiq_terminate_service_internal(service);
+ unlock_service(service);
+ }

- vchiq_terminate_service_internal(service);
- unlock_service(service);
- }
+ /* ...and wait for them to die */
+ i = 0;
+ while ((service = next_service_by_instance(state, instance, &i))) {
+ USER_SERVICE_T *user_service = service->base.userdata;

- /* ...and wait for them to die */
- i = 0;
- while ((service = next_service_by_instance(state, instance, &i))
- != NULL) {
- USER_SERVICE_T *user_service = service->base.userdata;
+ wait_for_completion(&service->remove_event);
+
+ BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE);

- wait_for_completion(&service->remove_event);
+ spin_lock(&msg_queue_spinlock);
+
+ while (user_service->msg_remove != user_service->msg_insert) {
+ VCHIQ_HEADER_T *header;
+ int m = user_service->msg_remove & (MSG_QUEUE_SIZE - 1);

- BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE);
+ header = user_service->msg_queue[m];
+ user_service->msg_remove++;
+ spin_unlock(&msg_queue_spinlock);

+ if (header)
+ vchiq_release_message(service->handle, header);
spin_lock(&msg_queue_spinlock);
+ }

- while (user_service->msg_remove !=
- user_service->msg_insert) {
- VCHIQ_HEADER_T *header;
- int m = user_service->msg_remove &
- (MSG_QUEUE_SIZE - 1);
+ spin_unlock(&msg_queue_spinlock);

- header = user_service->msg_queue[m];
- user_service->msg_remove++;
- spin_unlock(&msg_queue_spinlock);
+ unlock_service(service);
+ }

- if (header)
- vchiq_release_message(
- service->handle,
- header);
- spin_lock(&msg_queue_spinlock);
- }
+ /* Release any closed services */
+ while (instance->completion_remove !=
+ instance->completion_insert) {
+ VCHIQ_COMPLETION_DATA_T *completion;
+ VCHIQ_SERVICE_T *service;

- spin_unlock(&msg_queue_spinlock);
+ completion = &instance->completions[
+ instance->completion_remove & (MAX_COMPLETIONS - 1)];
+ service = completion->service_userdata;
+ if (completion->reason == VCHIQ_SERVICE_CLOSED) {
+ USER_SERVICE_T *user_service = service->base.userdata;

+ /* Wake any blocked user-thread */
+ if (instance->use_close_delivered)
+ complete(&user_service->close_event);
unlock_service(service);
}
+ instance->completion_remove++;
+ }

- /* Release any closed services */
- while (instance->completion_remove !=
- instance->completion_insert) {
- VCHIQ_COMPLETION_DATA_T *completion;
- VCHIQ_SERVICE_T *service;
-
- completion = &instance->completions[
- instance->completion_remove &
- (MAX_COMPLETIONS - 1)];
- service = completion->service_userdata;
- if (completion->reason == VCHIQ_SERVICE_CLOSED) {
- USER_SERVICE_T *user_service =
- service->base.userdata;
-
- /* Wake any blocked user-thread */
- if (instance->use_close_delivered)
- complete(&user_service->close_event);
- unlock_service(service);
- }
- instance->completion_remove++;
- }
-
- /* Release the PEER service count. */
- vchiq_release_internal(instance->state, NULL);
+ /* Release the PEER service count. */
+ vchiq_release_internal(instance->state, NULL);

- {
- struct bulk_waiter_node *waiter, *next;
+ {
+ struct bulk_waiter_node *waiter, *next;

- list_for_each_entry_safe(waiter, next,
- &instance->bulk_waiter_list, list) {
- list_del(&waiter->list);
- vchiq_log_info(vchiq_arm_log_level,
- "bulk_waiter - cleaned up %pK for pid %d",
- waiter, waiter->pid);
- kfree(waiter);
- }
+ list_for_each_entry_safe(waiter, next,
+ &instance->bulk_waiter_list, list) {
+ list_del(&waiter->list);
+ vchiq_log_info(vchiq_arm_log_level,
+ "bulk_waiter - cleaned up %pK for pid %d",
+ waiter, waiter->pid);
+ kfree(waiter);
}
+ }

- vchiq_debugfs_remove_instance(instance);
+ vchiq_debugfs_remove_instance(instance);

- kfree(instance);
- file->private_data = NULL;
- } break;
-
- default:
- vchiq_log_error(vchiq_arm_log_level,
- "Unknown minor device: %d", dev);
- ret = -ENXIO;
- }
+ kfree(instance);
+ file->private_data = NULL;

out:
return ret;
@@ -3613,7 +3566,7 @@ static int __init vchiq_driver_init(void)
return PTR_ERR(vchiq_class);
}

- ret = alloc_chrdev_region(&vchiq_devid, VCHIQ_MINOR, 1, DEVICE_NAME);
+ ret = alloc_chrdev_region(&vchiq_devid, 0, 1, DEVICE_NAME);
if (ret) {
pr_err("Failed to allocate vchiq's chrdev region\n");
goto class_destroy;
--
2.19.1
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