]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/commitdiff
wimax: no need to check return value of debugfs_create functions
authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 10 Aug 2019 10:17:16 +0000 (12:17 +0200)
committerDavid S. Miller <davem@davemloft.net>
Sat, 10 Aug 2019 22:25:47 +0000 (15:25 -0700)
When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

This cleans up a lot of unneeded code and logic around the debugfs wimax
files, making all of this much simpler and easier to understand.

Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
Cc: linux-wimax@intel.com
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/wimax/i2400m/debugfs.c
drivers/net/wimax/i2400m/driver.c
drivers/net/wimax/i2400m/i2400m.h
drivers/net/wimax/i2400m/usb.c
include/linux/wimax/debug.h
net/wimax/debugfs.c
net/wimax/stack.c
net/wimax/wimax-internal.h

index 6544ac9df0478fe6bb05f7aa1c95edaa180dfef4..73f5892ce6c1fab640ae3c2a9c8c2141f2136f2f 100644 (file)
@@ -30,15 +30,6 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_netdev_queue_stopped,
                        debugfs_netdev_queue_stopped_get,
                        NULL, "%llu\n");
 
-
-static
-struct dentry *debugfs_create_netdev_queue_stopped(
-       const char *name, struct dentry *parent, struct i2400m *i2400m)
-{
-       return debugfs_create_file(name, 0400, parent, i2400m,
-                                  &fops_netdev_queue_stopped);
-}
-
 /*
  * We don't allow partial reads of this file, as then the reader would
  * get weirdly confused data as it is updated.
@@ -167,15 +158,6 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_suspend,
                        NULL, debugfs_i2400m_suspend_set,
                        "%llu\n");
 
-static
-struct dentry *debugfs_create_i2400m_suspend(
-       const char *name, struct dentry *parent, struct i2400m *i2400m)
-{
-       return debugfs_create_file(name, 0200, parent, i2400m,
-                                  &fops_i2400m_suspend);
-}
-
-
 /*
  * Reset the device
  *
@@ -205,73 +187,25 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_reset,
                        NULL, debugfs_i2400m_reset_set,
                        "%llu\n");
 
-static
-struct dentry *debugfs_create_i2400m_reset(
-       const char *name, struct dentry *parent, struct i2400m *i2400m)
+void i2400m_debugfs_add(struct i2400m *i2400m)
 {
-       return debugfs_create_file(name, 0200, parent, i2400m,
-                                  &fops_i2400m_reset);
-}
-
-
-#define __debugfs_register(prefix, name, parent)                       \
-do {                                                                   \
-       result = d_level_register_debugfs(prefix, name, parent);        \
-       if (result < 0)                                                 \
-               goto error;                                             \
-} while (0)
-
-
-int i2400m_debugfs_add(struct i2400m *i2400m)
-{
-       int result;
-       struct device *dev = i2400m_dev(i2400m);
        struct dentry *dentry = i2400m->wimax_dev.debugfs_dentry;
-       struct dentry *fd;
 
        dentry = debugfs_create_dir("i2400m", dentry);
-       result = PTR_ERR(dentry);
-       if (IS_ERR(dentry)) {
-               if (result == -ENODEV)
-                       result = 0;     /* No debugfs support */
-               goto error;
-       }
        i2400m->debugfs_dentry = dentry;
-       __debugfs_register("dl_", control, dentry);
-       __debugfs_register("dl_", driver, dentry);
-       __debugfs_register("dl_", debugfs, dentry);
-       __debugfs_register("dl_", fw, dentry);
-       __debugfs_register("dl_", netdev, dentry);
-       __debugfs_register("dl_", rfkill, dentry);
-       __debugfs_register("dl_", rx, dentry);
-       __debugfs_register("dl_", tx, dentry);
-
-       fd = debugfs_create_size_t("tx_in", 0400, dentry,
-                                  &i2400m->tx_in);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "tx_in: %d\n", result);
-               goto error;
-       }
 
-       fd = debugfs_create_size_t("tx_out", 0400, dentry,
-                                  &i2400m->tx_out);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "tx_out: %d\n", result);
-               goto error;
-       }
+       d_level_register_debugfs("dl_", control, dentry);
+       d_level_register_debugfs("dl_", driver, dentry);
+       d_level_register_debugfs("dl_", debugfs, dentry);
+       d_level_register_debugfs("dl_", fw, dentry);
+       d_level_register_debugfs("dl_", netdev, dentry);
+       d_level_register_debugfs("dl_", rfkill, dentry);
+       d_level_register_debugfs("dl_", rx, dentry);
+       d_level_register_debugfs("dl_", tx, dentry);
 
-       fd = debugfs_create_u32("state", 0600, dentry,
-                               &i2400m->state);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "state: %d\n", result);
-               goto error;
-       }
+       debugfs_create_size_t("tx_in", 0400, dentry, &i2400m->tx_in);
+       debugfs_create_size_t("tx_out", 0400, dentry, &i2400m->tx_out);
+       debugfs_create_u32("state", 0600, dentry, &i2400m->state);
 
        /*
         * Trace received messages from user space
@@ -295,60 +229,22 @@ int i2400m_debugfs_add(struct i2400m *i2400m)
         * It is not really very atomic, but it is also not too
         * critical.
         */
-       fd = debugfs_create_u8("trace_msg_from_user", 0600, dentry,
-                              &i2400m->trace_msg_from_user);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "trace_msg_from_user: %d\n", result);
-               goto error;
-       }
+       debugfs_create_u8("trace_msg_from_user", 0600, dentry,
+                         &i2400m->trace_msg_from_user);
 
-       fd = debugfs_create_netdev_queue_stopped("netdev_queue_stopped",
-                                                dentry, i2400m);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "netdev_queue_stopped: %d\n", result);
-               goto error;
-       }
+       debugfs_create_file("netdev_queue_stopped", 0400, dentry, i2400m,
+                           &fops_netdev_queue_stopped);
 
-       fd = debugfs_create_file("rx_stats", 0600, dentry, i2400m,
-                                &i2400m_rx_stats_fops);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "rx_stats: %d\n", result);
-               goto error;
-       }
+       debugfs_create_file("rx_stats", 0600, dentry, i2400m,
+                           &i2400m_rx_stats_fops);
 
-       fd = debugfs_create_file("tx_stats", 0600, dentry, i2400m,
-                                &i2400m_tx_stats_fops);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "tx_stats: %d\n", result);
-               goto error;
-       }
+       debugfs_create_file("tx_stats", 0600, dentry, i2400m,
+                           &i2400m_tx_stats_fops);
 
-       fd = debugfs_create_i2400m_suspend("suspend", dentry, i2400m);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry suspend: %d\n",
-                       result);
-               goto error;
-       }
+       debugfs_create_file("suspend", 0200, dentry, i2400m,
+                           &fops_i2400m_suspend);
 
-       fd = debugfs_create_i2400m_reset("reset", dentry, i2400m);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry reset: %d\n", result);
-               goto error;
-       }
-
-       result = 0;
-error:
-       return result;
+       debugfs_create_file("reset", 0200, dentry, i2400m, &fops_i2400m_reset);
 }
 
 void i2400m_debugfs_rm(struct i2400m *i2400m)
index 0a29222a1bf9dcbee35cab397be658f91e9debd0..f66c0f8f6f4a0849f61146d30625b807d45d2eab 100644 (file)
@@ -905,11 +905,7 @@ int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags)
                goto error_sysfs_setup;
        }
 
-       result = i2400m_debugfs_add(i2400m);
-       if (result < 0) {
-               dev_err(dev, "cannot setup i2400m's debugfs: %d\n", result);
-               goto error_debugfs_setup;
-       }
+       i2400m_debugfs_add(i2400m);
 
        result = i2400m_dev_start(i2400m, bm_flags);
        if (result < 0)
@@ -919,7 +915,6 @@ int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags)
 
 error_dev_start:
        i2400m_debugfs_rm(i2400m);
-error_debugfs_setup:
        sysfs_remove_group(&i2400m->wimax_dev.net_dev->dev.kobj,
                           &i2400m_dev_attr_group);
 error_sysfs_setup:
index 5a34e72bab9afb42d670f7ea72286c9e191a31e2..a3733a6d14f5eee8ee42ab72f41a9900aa6649ff 100644 (file)
@@ -812,13 +812,10 @@ enum i2400m_pt;
 int i2400m_tx(struct i2400m *, const void *, size_t, enum i2400m_pt);
 
 #ifdef CONFIG_DEBUG_FS
-int i2400m_debugfs_add(struct i2400m *);
+void i2400m_debugfs_add(struct i2400m *);
 void i2400m_debugfs_rm(struct i2400m *);
 #else
-static inline int i2400m_debugfs_add(struct i2400m *i2400m)
-{
-       return 0;
-}
+static inline void i2400m_debugfs_add(struct i2400m *i2400m) {}
 static inline void i2400m_debugfs_rm(struct i2400m *i2400m) {}
 #endif
 
index 2075e7b1fff67f2cf6c87754fe87fa63015c3d70..6953f904232f8d9b7877f11ebb5af1726de57dbc 100644 (file)
@@ -366,61 +366,25 @@ struct d_level D_LEVEL[] = {
 };
 size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
 
-
-#define __debugfs_register(prefix, name, parent)                       \
-do {                                                                   \
-       result = d_level_register_debugfs(prefix, name, parent);        \
-       if (result < 0)                                                 \
-               goto error;                                             \
-} while (0)
-
-
 static
-int i2400mu_debugfs_add(struct i2400mu *i2400mu)
+void i2400mu_debugfs_add(struct i2400mu *i2400mu)
 {
-       int result;
-       struct device *dev = &i2400mu->usb_iface->dev;
        struct dentry *dentry = i2400mu->i2400m.wimax_dev.debugfs_dentry;
-       struct dentry *fd;
 
        dentry = debugfs_create_dir("i2400m-usb", dentry);
-       result = PTR_ERR(dentry);
-       if (IS_ERR(dentry)) {
-               if (result == -ENODEV)
-                       result = 0;     /* No debugfs support */
-               goto error;
-       }
        i2400mu->debugfs_dentry = dentry;
-       __debugfs_register("dl_", usb, dentry);
-       __debugfs_register("dl_", fw, dentry);
-       __debugfs_register("dl_", notif, dentry);
-       __debugfs_register("dl_", rx, dentry);
-       __debugfs_register("dl_", tx, dentry);
 
-       /* Don't touch these if you don't know what you are doing */
-       fd = debugfs_create_u8("rx_size_auto_shrink", 0600, dentry,
-                              &i2400mu->rx_size_auto_shrink);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "rx_size_auto_shrink: %d\n", result);
-               goto error;
-       }
+       d_level_register_debugfs("dl_", usb, dentry);
+       d_level_register_debugfs("dl_", fw, dentry);
+       d_level_register_debugfs("dl_", notif, dentry);
+       d_level_register_debugfs("dl_", rx, dentry);
+       d_level_register_debugfs("dl_", tx, dentry);
 
-       fd = debugfs_create_size_t("rx_size", 0600, dentry,
-                                  &i2400mu->rx_size);
-       result = PTR_ERR(fd);
-       if (IS_ERR(fd) && result != -ENODEV) {
-               dev_err(dev, "Can't create debugfs entry "
-                       "rx_size: %d\n", result);
-               goto error;
-       }
-
-       return 0;
+       /* Don't touch these if you don't know what you are doing */
+       debugfs_create_u8("rx_size_auto_shrink", 0600, dentry,
+                         &i2400mu->rx_size_auto_shrink);
 
-error:
-       debugfs_remove_recursive(i2400mu->debugfs_dentry);
-       return result;
+       debugfs_create_size_t("rx_size", 0600, dentry, &i2400mu->rx_size);
 }
 
 
@@ -534,15 +498,9 @@ int i2400mu_probe(struct usb_interface *iface,
                dev_err(dev, "cannot setup device: %d\n", result);
                goto error_setup;
        }
-       result = i2400mu_debugfs_add(i2400mu);
-       if (result < 0) {
-               dev_err(dev, "Can't register i2400mu's debugfs: %d\n", result);
-               goto error_debugfs_add;
-       }
+       i2400mu_debugfs_add(i2400mu);
        return 0;
 
-error_debugfs_add:
-       i2400m_release(i2400m);
 error_setup:
        usb_set_intfdata(iface, NULL);
        usb_put_dev(i2400mu->usb_dev);
index 7cb63e4ec0ae813ef6c04b4f563bdb14c65a6433..4dd2c1cea6a93180c99abb941d6507d56c8c0314 100644 (file)
@@ -98,9 +98,7 @@
  * To manipulate from user space the levels, create a debugfs dentry
  * and then register each submodule with:
  *
- *     result = d_level_register_debugfs("PREFIX_", submodule_X, parent);
- *     if (result < 0)
- *            goto error;
+ *     d_level_register_debugfs("PREFIX_", submodule_X, parent);
  *
  * Where PREFIX_ is a name of your chosing. This will create debugfs
  * file with a single numeric value that can be use to tweak it. To
@@ -408,25 +406,13 @@ do {                                                      \
  * @submodule: name of submodule (not a string, just the name)
  * @dentry: debugfs parent dentry
  *
- * Returns: 0 if ok, < 0 errno on error.
- *
  * For removing, just use debugfs_remove_recursive() on the parent.
  */
 #define d_level_register_debugfs(prefix, name, parent)                 \
 ({                                                                     \
-       int rc;                                                         \
-       struct dentry *fd;                                              \
-       struct dentry *verify_parent_type = parent;                     \
-       fd = debugfs_create_u8(                                         \
-               prefix #name, 0600, verify_parent_type,                 \
+       debugfs_create_u8(                                              \
+               prefix #name, 0600, parent,                             \
                &(D_LEVEL[__D_SUBMODULE_ ## name].level));              \
-       rc = PTR_ERR(fd);                                               \
-       if (IS_ERR(fd) && rc != -ENODEV)                                \
-               printk(KERN_ERR "%s: Can't create debugfs entry %s: "   \
-                      "%d\n", __func__, prefix #name, rc);             \
-       else                                                            \
-               rc = 0;                                                 \
-       rc;                                                             \
 })
 
 
index 1af56df3027681168d21558914a17334e45d3a6d..3c54bb6b925a65098e27fe735623a1c6752da5f0 100644 (file)
 #define D_SUBMODULE debugfs
 #include "debug-levels.h"
 
-
-#define __debugfs_register(prefix, name, parent)                       \
-do {                                                                   \
-       result = d_level_register_debugfs(prefix, name, parent);        \
-       if (result < 0)                                                 \
-               goto error;                                             \
-} while (0)
-
-
-int wimax_debugfs_add(struct wimax_dev *wimax_dev)
+void wimax_debugfs_add(struct wimax_dev *wimax_dev)
 {
-       int result;
        struct net_device *net_dev = wimax_dev->net_dev;
-       struct device *dev = net_dev->dev.parent;
        struct dentry *dentry;
        char buf[128];
 
        snprintf(buf, sizeof(buf), "wimax:%s", net_dev->name);
        dentry = debugfs_create_dir(buf, NULL);
-       result = PTR_ERR(dentry);
-       if (IS_ERR(dentry)) {
-               if (result == -ENODEV)
-                       result = 0;     /* No debugfs support */
-               else
-                       dev_err(dev, "Can't create debugfs dentry: %d\n",
-                               result);
-               goto out;
-       }
        wimax_dev->debugfs_dentry = dentry;
-       __debugfs_register("wimax_dl_", debugfs, dentry);
-       __debugfs_register("wimax_dl_", id_table, dentry);
-       __debugfs_register("wimax_dl_", op_msg, dentry);
-       __debugfs_register("wimax_dl_", op_reset, dentry);
-       __debugfs_register("wimax_dl_", op_rfkill, dentry);
-       __debugfs_register("wimax_dl_", op_state_get, dentry);
-       __debugfs_register("wimax_dl_", stack, dentry);
-       result = 0;
-out:
-       return result;
 
-error:
-       debugfs_remove_recursive(wimax_dev->debugfs_dentry);
-       return result;
+       d_level_register_debugfs("wimax_dl_", debugfs, dentry);
+       d_level_register_debugfs("wimax_dl_", id_table, dentry);
+       d_level_register_debugfs("wimax_dl_", op_msg, dentry);
+       d_level_register_debugfs("wimax_dl_", op_reset, dentry);
+       d_level_register_debugfs("wimax_dl_", op_rfkill, dentry);
+       d_level_register_debugfs("wimax_dl_", op_state_get, dentry);
+       d_level_register_debugfs("wimax_dl_", stack, dentry);
 }
 
 void wimax_debugfs_rm(struct wimax_dev *wimax_dev)
index 1ba99d65fecac214c96130995389dd7f0adaabf0..4b9b1c5e8f3a7ce7d2b1272f4ae86babf4b8927c 100644 (file)
@@ -481,12 +481,7 @@ int wimax_dev_add(struct wimax_dev *wimax_dev, struct net_device *net_dev)
        /* Set up user-space interaction */
        mutex_lock(&wimax_dev->mutex);
        wimax_id_table_add(wimax_dev);
-       result = wimax_debugfs_add(wimax_dev);
-       if (result < 0) {
-               dev_err(dev, "cannot initialize debugfs: %d\n",
-                       result);
-               goto error_debugfs_add;
-       }
+       wimax_debugfs_add(wimax_dev);
 
        __wimax_state_set(wimax_dev, WIMAX_ST_DOWN);
        mutex_unlock(&wimax_dev->mutex);
@@ -498,10 +493,6 @@ int wimax_dev_add(struct wimax_dev *wimax_dev, struct net_device *net_dev)
        d_fnend(3, dev, "(wimax_dev %p net_dev %p) = 0\n", wimax_dev, net_dev);
        return 0;
 
-error_debugfs_add:
-       wimax_id_table_rm(wimax_dev);
-       mutex_unlock(&wimax_dev->mutex);
-       wimax_rfkill_rm(wimax_dev);
 error_rfkill_add:
        d_fnend(3, dev, "(wimax_dev %p net_dev %p) = %d\n",
                wimax_dev, net_dev, result);
index e819a09337ee3e489d42c8073d115139df65a7f2..40751207296cba357447b3248ccfdc34e9d65072 100644 (file)
@@ -57,13 +57,10 @@ void __wimax_state_set(struct wimax_dev *wimax_dev, enum wimax_st state)
 void __wimax_state_change(struct wimax_dev *, enum wimax_st);
 
 #ifdef CONFIG_DEBUG_FS
-int wimax_debugfs_add(struct wimax_dev *);
+void wimax_debugfs_add(struct wimax_dev *);
 void wimax_debugfs_rm(struct wimax_dev *);
 #else
-static inline int wimax_debugfs_add(struct wimax_dev *wimax_dev)
-{
-       return 0;
-}
+static inline void wimax_debugfs_add(struct wimax_dev *wimax_dev) {}
 static inline void wimax_debugfs_rm(struct wimax_dev *wimax_dev) {}
 #endif