powerpc/powernv: no need to check return value of debugfs_create functions

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.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200209105901.1620958-6-gregkh@linuxfoundation.org

diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
index eb2e75d..d6d64f8 100644 (file)
--- a/arch/powerpc/platforms/powernv/memtrace.c
+++ b/arch/powerpc/platforms/powernv/memtrace.c
@@ -187,11 +187,6 @@ static int memtrace_init_debugfs(void)
 
                snprintf(ent->name, 16, "%08x", ent->nid);
                dir = debugfs_create_dir(ent->name, memtrace_debugfs_dir);
-               if (!dir) {
-                       pr_err("Failed to create debugfs directory for node %d\n",
-                               ent->nid);
-                       return -1;
-               }
 
                ent->dir = dir;
                debugfs_create_file("trace", 0400, dir, ent, &memtrace_fops);
@@ -314,8 +309,6 @@ static int memtrace_init(void)
 {
        memtrace_debugfs_dir = debugfs_create_dir("memtrace",
                                                  powerpc_debugfs_root);
-       if (!memtrace_debugfs_dir)
-               return -1;
 
        debugfs_create_file("enable", 0600, memtrace_debugfs_dir,
                            NULL, &memtrace_init_fops);

diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c
index 000b350..968b9a4 100644 (file)
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -35,11 +35,10 @@ static int imc_mem_set(void *data, u64 val)
 }
 DEFINE_DEBUGFS_ATTRIBUTE(fops_imc_x64, imc_mem_get, imc_mem_set, "0x%016llx\n");
 
-static struct dentry *imc_debugfs_create_x64(const char *name, umode_t mode,
-                                            struct dentry *parent, u64  *value)
+static void imc_debugfs_create_x64(const char *name, umode_t mode,
+                                  struct dentry *parent, u64  *value)
 {
-       return debugfs_create_file_unsafe(name, mode, parent,
-                                         value, &fops_imc_x64);
+       debugfs_create_file_unsafe(name, mode, parent, value, &fops_imc_x64);
 }
 
 /*
@@ -59,9 +58,6 @@ static void export_imc_mode_and_cmd(struct device_node *node,
 
        imc_debugfs_parent = debugfs_create_dir("imc", powerpc_debugfs_root);
 
-       if (!imc_debugfs_parent)
-               return;
-
        if (of_property_read_u32(node, "cb_offset", &cb_offset))
                cb_offset = IMC_CNTL_BLK_OFFSET;
 
@@ -69,21 +65,15 @@ static void export_imc_mode_and_cmd(struct device_node *node,
                loc = (u64)(ptr->vbase) + cb_offset;
                imc_mode_addr = (u64 *)(loc + IMC_CNTL_BLK_MODE_OFFSET);
                sprintf(mode, "imc_mode_%d", (u32)(ptr->id));
-               if (!imc_debugfs_create_x64(mode, 0600, imc_debugfs_parent,
-                                           imc_mode_addr))
-                       goto err;
+               imc_debugfs_create_x64(mode, 0600, imc_debugfs_parent,
+                                      imc_mode_addr);
 
                imc_cmd_addr = (u64 *)(loc + IMC_CNTL_BLK_CMD_OFFSET);
                sprintf(cmd, "imc_cmd_%d", (u32)(ptr->id));
-               if (!imc_debugfs_create_x64(cmd, 0600, imc_debugfs_parent,
-                                           imc_cmd_addr))
-                       goto err;
+               imc_debugfs_create_x64(cmd, 0600, imc_debugfs_parent,
+                                      imc_cmd_addr);
                ptr++;
        }
-       return;
-
-err:
-       debugfs_remove_recursive(imc_debugfs_parent);
 }
 
 /*

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 22c22cd..57d3a6a 100644 (file)
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3174,11 +3174,6 @@ static void pnv_pci_ioda_create_dbgfs(void)
 
                sprintf(name, "PCI%04x", hose->global_number);
                phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root);
-               if (!phb->dbgfs) {
-                       pr_warn("%s: Error on creating debugfs on PHB#%x\n",
-                               __func__, hose->global_number);
-                       continue;
-               }
 
                debugfs_create_file_unsafe("dump_diag_regs", 0200, phb->dbgfs,
                                           phb, &pnv_pci_diag_data_fops);

diff --git a/arch/powerpc/platforms/powernv/vas-debug.c b/arch/powerpc/platforms/powernv/vas-debug.c
index 09e63df..44035a3 100644 (file)
--- a/arch/powerpc/platforms/powernv/vas-debug.c
+++ b/arch/powerpc/platforms/powernv/vas-debug.c
@@ -115,7 +115,7 @@ void vas_window_free_dbgdir(struct vas_window *window)
 
 void vas_window_init_dbgdir(struct vas_window *window)
 {
-       struct dentry *f, *d;
+       struct dentry *d;
 
        if (!window->vinst->dbgdir)
                return;
@@ -127,28 +127,10 @@ void vas_window_init_dbgdir(struct vas_window *window)
        snprintf(window->dbgname, 16, "w%d", window->winid);
 
        d = debugfs_create_dir(window->dbgname, window->vinst->dbgdir);
-       if (IS_ERR(d))
-               goto free_name;
-
        window->dbgdir = d;
 
-       f = debugfs_create_file("info", 0444, d, window, &info_fops);
-       if (IS_ERR(f))
-               goto remove_dir;
-
-       f = debugfs_create_file("hvwc", 0444, d, window, &hvwc_fops);
-       if (IS_ERR(f))
-               goto remove_dir;
-
-       return;
-
-remove_dir:
-       debugfs_remove_recursive(window->dbgdir);
-       window->dbgdir = NULL;
-
-free_name:
-       kfree(window->dbgname);
-       window->dbgname = NULL;
+       debugfs_create_file("info", 0444, d, window, &info_fops);
+       debugfs_create_file("hvwc", 0444, d, window, &hvwc_fops);
 }
 
 void vas_instance_init_dbgdir(struct vas_instance *vinst)
@@ -156,8 +138,6 @@ void vas_instance_init_dbgdir(struct vas_instance *vinst)
        struct dentry *d;
 
        vas_init_dbgdir();
-       if (!vas_debugfs)
-               return;
 
        vinst->dbgname = kzalloc(16, GFP_KERNEL);
        if (!vinst->dbgname)
@@ -166,16 +146,7 @@ void vas_instance_init_dbgdir(struct vas_instance *vinst)
        snprintf(vinst->dbgname, 16, "v%d", vinst->vas_id);
 
        d = debugfs_create_dir(vinst->dbgname, vas_debugfs);
-       if (IS_ERR(d))
-               goto free_name;
-
        vinst->dbgdir = d;
-       return;
-
-free_name:
-       kfree(vinst->dbgname);
-       vinst->dbgname = NULL;
-       vinst->dbgdir = NULL;
 }
 
 /*
@@ -191,6 +162,4 @@ void vas_init_dbgdir(void)
 
        first_time = false;
        vas_debugfs = debugfs_create_dir("vas", NULL);
-       if (IS_ERR(vas_debugfs))
-               vas_debugfs = NULL;
 }