target/linux/brcm2708/patches-4.14/950-0381-staging-vc04_services-no-need-to-check-debugfs-retur.patch

   1 From 5e4d56448e08a7f4bf39e1b3f4c43916ff74d337 Mon Sep 17 00:00:00 2001
   2 From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
   3 Date: Fri, 1 Jun 2018 13:09:59 +0200
   4 Subject: [PATCH 381/454] staging: vc04_services: no need to check debugfs
   5  return values
   6
   7 commit 0723103f8ba15a019bbcaf6f130d73d05337332f upstream
   8
   9 When calling debugfs functions, there is no need to ever check the
  10 return value.  The function can work or not, but the code logic should
  11 never do something different based on this.
  12
  13 Clean up the vchiq_arm code by not caring about the value of debugfs
  14 calls.  This ends up removing a number of lines of code that are not
  15 needed.
  16
  17 Cc: Stefan Wahren <stefan.wahren@i2se.com>
  18 Cc: Kees Cook <keescook@chromium.org>
  19 Cc: Dan Carpenter <dan.carpenter@oracle.com>
  20 Cc: Arnd Bergmann <arnd@arndb.de>
  21 Cc: Keerthi Reddy <keerthigd4990@gmail.com>
  22 Cc: linux-rpi-kernel@lists.infradead.org
  23 Cc: linux-arm-kernel@lists.infradead.org
  24 Reviewed-by: Eric Anholt <eric@anholt.net>
  25 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  26 ---
  27  .../interface/vchiq_arm/vchiq_arm.c           |  8 +-
  28  .../interface/vchiq_arm/vchiq_debugfs.c       | 73 +++----------------
  29  .../interface/vchiq_arm/vchiq_debugfs.h       |  4 +-
  30  3 files changed, 15 insertions(+), 70 deletions(-)
  31
  32 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
  33 +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
  34 @@ -1753,7 +1753,7 @@ vchiq_open(struct inode *inode, struct f
  35                 instance->state = state;
  36                 instance->pid = current->tgid;
  37
  38 -               (void)vchiq_debugfs_add_instance(instance);
  39 +               vchiq_debugfs_add_instance(instance);
  40
  41                 sema_init(&instance->insert_event, 0);
  42                 sema_init(&instance->remove_event, 0);
  43 @@ -3437,9 +3437,7 @@ static int vchiq_probe(struct platform_d
  44                 goto failed_device_create;
  45
  46         /* create debugfs entries */
  47 -       err = vchiq_debugfs_init();
  48 -       if (err != 0)
  49 -               goto failed_debugfs_init;
  50 +       vchiq_debugfs_init();
  51
  52         vchiq_log_info(vchiq_arm_log_level,
  53                 "vchiq: initialised - version %d (min %d), device %d.%d",
  54 @@ -3448,8 +3446,6 @@ static int vchiq_probe(struct platform_d
  55
  56         return 0;
  57
  58 -failed_debugfs_init:
  59 -       device_destroy(vchiq_class, vchiq_devid);
  60  failed_device_create:
  61         class_destroy(vchiq_class);
  62  failed_class_create:
  63 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.c
  64 +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.c
  65 @@ -160,15 +160,12 @@ static const struct file_operations debu
  66  };
  67
  68  /* create an entry under <debugfs>/vchiq/log for each log category */
  69 -static int vchiq_debugfs_create_log_entries(struct dentry *top)
  70 +static void vchiq_debugfs_create_log_entries(struct dentry *top)
  71  {
  72         struct dentry *dir;
  73         size_t i;
  74 -       int ret = 0;
  75
  76         dir = debugfs_create_dir("log", vchiq_debugfs_top());
  77 -       if (!dir)
  78 -               return -ENOMEM;
  79         debugfs_info.log_categories = dir;
  80
  81         for (i = 0; i < n_log_entries; i++) {
  82 @@ -179,14 +176,8 @@ static int vchiq_debugfs_create_log_entr
  83                                           debugfs_info.log_categories,
  84                                           levp,
  85                                           &debugfs_log_fops);
  86 -               if (!dir) {
  87 -                       ret = -ENOMEM;
  88 -                       break;
  89 -               }
  90 -
  91                 vchiq_debugfs_log_entries[i].dir = dir;
  92         }
  93 -       return ret;
  94  }
  95
  96  static int debugfs_usecount_show(struct seq_file *f, void *offset)
  97 @@ -270,43 +261,22 @@ static const struct file_operations debu
  98  };
  99
 100  /* add an instance (process) to the debugfs entries */
 101 -int vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
 102 +void vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
 103  {
 104         char pidstr[16];
 105 -       struct dentry *top, *use_count, *trace;
 106 +       struct dentry *top;
 107         struct dentry *clients = vchiq_clients_top();
 108
 109         snprintf(pidstr, sizeof(pidstr), "%d",
 110                  vchiq_instance_get_pid(instance));
 111
 112         top = debugfs_create_dir(pidstr, clients);
 113 -       if (!top)
 114 -               goto fail_top;
 115
 116 -       use_count = debugfs_create_file("use_count",
 117 -                                       0444, top,
 118 -                                       instance,
 119 -                                       &debugfs_usecount_fops);
 120 -       if (!use_count)
 121 -               goto fail_use_count;
 122 -
 123 -       trace = debugfs_create_file("trace",
 124 -                                   0644, top,
 125 -                                   instance,
 126 -                                   &debugfs_trace_fops);
 127 -       if (!trace)
 128 -               goto fail_trace;
 129 +       debugfs_create_file("use_count", 0444, top, instance,
 130 +                           &debugfs_usecount_fops);
 131 +       debugfs_create_file("trace", 0644, top, instance, &debugfs_trace_fops);
 132
 133         vchiq_instance_get_debugfs_node(instance)->dentry = top;
 134 -
 135 -       return 0;
 136 -
 137 -fail_trace:
 138 -       debugfs_remove(use_count);
 139 -fail_use_count:
 140 -       debugfs_remove(top);
 141 -fail_top:
 142 -       return -ENOMEM;
 143  }
 144
 145  void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance)
 146 @@ -316,32 +286,13 @@ void vchiq_debugfs_remove_instance(VCHIQ
 147         debugfs_remove_recursive(node->dentry);
 148  }
 149
 150 -
 151 -int vchiq_debugfs_init(void)
 152 +void vchiq_debugfs_init(void)
 153  {
 154 -       BUG_ON(debugfs_info.vchiq_cfg_dir != NULL);
 155 -
 156         debugfs_info.vchiq_cfg_dir = debugfs_create_dir("vchiq", NULL);
 157 -       if (debugfs_info.vchiq_cfg_dir == NULL)
 158 -               goto fail;
 159 -
 160         debugfs_info.clients = debugfs_create_dir("clients",
 161                                 vchiq_debugfs_top());
 162 -       if (!debugfs_info.clients)
 163 -               goto fail;
 164
 165 -       if (vchiq_debugfs_create_log_entries(vchiq_debugfs_top()) != 0)
 166 -               goto fail;
 167 -
 168 -       return 0;
 169 -
 170 -fail:
 171 -       vchiq_debugfs_deinit();
 172 -       vchiq_log_error(vchiq_arm_log_level,
 173 -               "%s: failed to create debugfs directory",
 174 -               __func__);
 175 -
 176 -       return -ENOMEM;
 177 +       vchiq_debugfs_create_log_entries(vchiq_debugfs_top());
 178  }
 179
 180  /* remove all the debugfs entries */
 181 @@ -363,18 +314,16 @@ static struct dentry *vchiq_debugfs_top(
 182
 183  #else /* CONFIG_DEBUG_FS */
 184
 185 -int vchiq_debugfs_init(void)
 186 +void vchiq_debugfs_init(void)
 187  {
 188 -       return 0;
 189  }
 190
 191  void vchiq_debugfs_deinit(void)
 192  {
 193  }
 194
 195 -int vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
 196 +void vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
 197  {
 198 -       return 0;
 199  }
 200
 201  void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance)
 202 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.h
 203 +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.h
 204 @@ -40,11 +40,11 @@ typedef struct vchiq_debugfs_node_struct
 205      struct dentry *dentry;
 206  } VCHIQ_DEBUGFS_NODE_T;
 207
 208 -int vchiq_debugfs_init(void);
 209 +void vchiq_debugfs_init(void);
 210
 211  void vchiq_debugfs_deinit(void);
 212
 213 -int vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance);
 214 +void vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance);
 215
 216  void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance);
 217