From 2803ac7bf20129365ff7b774adf63e0fd35c4221 Mon Sep 17 00:00:00 2001 From: Mitchel Humpherys Date: Mon, 17 Feb 2014 13:58:37 -0800 Subject: [PATCH] staging: ion: Make sure all clients are exposed in debugfs Currently, if multiple Ion clients are created with the same name, only the first one shows up in debugfs. Rectify this by adding a monotonically-increasing serial number to the debug names of Ion clients. Cc: Colin Cross Cc: Android Kernel Team Signed-off-by: Mitchel Humpherys [jstultz: Minor commit subject tweaks] Signed-off-by: John Stultz Signed-off-by: Greg Kroah-Hartman --- drivers/staging/android/ion/ion.c | 38 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index eac4bce0894c..577669789de1 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -72,6 +72,8 @@ struct ion_device { * @idr: an idr space for allocating handle ids * @lock: lock protecting the tree of handles * @name: used for debugging + * @display_name: used for debugging (unique version of @name) + * @display_serial: used for debugging (to make display_name unique) * @task: used for debugging * * A client represents a list of buffers this client may access. @@ -85,6 +87,8 @@ struct ion_client { struct idr idr; struct mutex lock; const char *name; + char *display_name; + int display_serial; struct task_struct *task; pid_t pid; struct dentry *debug_root; @@ -711,6 +715,21 @@ static const struct file_operations debug_client_fops = { .release = single_release, }; +static int ion_get_client_serial(const struct rb_root *root, + const unsigned char *name) +{ + int serial = -1; + struct rb_node *node; + for (node = rb_first(root); node; node = rb_next(node)) { + struct ion_client *client = rb_entry(node, struct ion_client, + node); + if (strcmp(client->name, name)) + continue; + serial = max(serial, client->display_serial); + } + return serial + 1; +} + struct ion_client *ion_client_create(struct ion_device *dev, const char *name) { @@ -721,6 +740,11 @@ struct ion_client *ion_client_create(struct ion_device *dev, struct ion_client *entry; pid_t pid; + if (!name) { + pr_err("%s: Name cannot be null\n", __func__); + return ERR_PTR(-EINVAL); + } + get_task_struct(current->group_leader); task_lock(current->group_leader); pid = task_pid_nr(current->group_leader); @@ -749,6 +773,13 @@ struct ion_client *ion_client_create(struct ion_device *dev, goto err_free_client; down_write(&dev->lock); + client->display_serial = ion_get_client_serial(&dev->clients, name); + client->display_name = kasprintf( + GFP_KERNEL, "%s-%d", name, client->display_serial); + if (!client->display_name) { + up_write(&dev->lock); + goto err_free_client_name; + } p = &dev->clients.rb_node; while (*p) { parent = *p; @@ -762,20 +793,22 @@ struct ion_client *ion_client_create(struct ion_device *dev, rb_link_node(&client->node, parent, p); rb_insert_color(&client->node, &dev->clients); - client->debug_root = debugfs_create_file(name, 0664, + client->debug_root = debugfs_create_file(client->display_name, 0664, dev->clients_debug_root, client, &debug_client_fops); if (!client->debug_root) { char buf[256], *path; path = dentry_path(dev->clients_debug_root, buf, 256); pr_err("Failed to create client debugfs at %s/%s\n", - path, name); + path, client->display_name); } up_write(&dev->lock); return client; +err_free_client_name: + kfree(client->name); err_free_client: kfree(client); err_put_task_struct: @@ -806,6 +839,7 @@ void ion_client_destroy(struct ion_client *client) debugfs_remove_recursive(client->debug_root); up_write(&dev->lock); + kfree(client->display_name); kfree(client->name); kfree(client); } -- 2.11.0