Return-path: Received: from mga09.intel.com ([134.134.136.24]:9561 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755927Ab0D2CPI (ORCPT ); Wed, 28 Apr 2010 22:15:08 -0400 Subject: Re: [patch] iwl: cleanup: remove unneeded error handling From: Zhu Yi To: Dan Carpenter Cc: "Ortiz, Samuel" , Intel Linux Wireless , "John W. Linville" , Andrew Morton , Alexey Dobriyan , "linux-wireless@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "kernel-janitors@vger.kernel.org" In-Reply-To: <20100428090115.GF29093@bicker> References: <20100428090115.GF29093@bicker> Content-Type: text/plain; charset="UTF-8" Date: Thu, 29 Apr 2010 10:12:14 +0800 Message-ID: <1272507134.14773.4339.camel@debian> Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Wed, 2010-04-28 at 17:01 +0800, Dan Carpenter wrote: > This is just a cleanup and doesn't change how the code works. > > debugfs_create_dir() and debugfs_create_file() return an error pointer > (-ENODEV) if CONFIG_DEBUG_FS is not enabled, otherwise if an error occurs > they return NULL. This is how they are implemented and what it says in > the DebugFS documentation. DebugFS can not be compiled as a module. > > As a result, we only need to check for error pointers and particularly > -ENODEV one time to know that DebugFS is enabled. This patch keeps the > first check for error pointers and removes the rest. > > The other reason for this patch, is that it silences some Smatch warnings. > Smatch sees the condition "(result != -ENODEV)" and assumes that it's > possible for "result" to equal -ENODEV. If it were possible it would lead > to an error pointer dereference. But since it's not, we can just remove > the check. > > Signed-off-by: Dan Carpenter Thanks. But looks like you missed the one in if_sdio_debugfs_init(). I don't think we even need to check -ENODEV ourselves because if DEBUG_FS is not compiled in, all the debugfs utility functions will become no-op. Signed-off-by: Dan Carpenter Signed-off-by: Zhu Yi diff --git a/drivers/net/wireless/iwmc3200wifi/bus.h b/drivers/net/wireless/iwmc3200wifi/bus.h index 836663e..62edd58 100644 --- a/drivers/net/wireless/iwmc3200wifi/bus.h +++ b/drivers/net/wireless/iwmc3200wifi/bus.h @@ -31,7 +31,7 @@ struct iwm_if_ops { int (*disable)(struct iwm_priv *iwm); int (*send_chunk)(struct iwm_priv *iwm, u8* buf, int count); - int (*debugfs_init)(struct iwm_priv *iwm, struct dentry *parent_dir); + void (*debugfs_init)(struct iwm_priv *iwm, struct dentry *parent_dir); void (*debugfs_exit)(struct iwm_priv *iwm); const char *umac_name; diff --git a/drivers/net/wireless/iwmc3200wifi/debug.h b/drivers/net/wireless/iwmc3200wifi/debug.h index e35c9b6..f98bf12 100644 --- a/drivers/net/wireless/iwmc3200wifi/debug.h +++ b/drivers/net/wireless/iwmc3200wifi/debug.h @@ -113,10 +113,10 @@ struct iwm_debugfs { }; #ifdef CONFIG_IWM_DEBUG -int iwm_debugfs_init(struct iwm_priv *iwm); +void iwm_debugfs_init(struct iwm_priv *iwm); void iwm_debugfs_exit(struct iwm_priv *iwm); #else -static inline int iwm_debugfs_init(struct iwm_priv *iwm) +static inline void iwm_debugfs_init(struct iwm_priv *iwm) { return 0; } diff --git a/drivers/net/wireless/iwmc3200wifi/debugfs.c b/drivers/net/wireless/iwmc3200wifi/debugfs.c index 7244413..53b0b77 100644 --- a/drivers/net/wireless/iwmc3200wifi/debugfs.c +++ b/drivers/net/wireless/iwmc3200wifi/debugfs.c @@ -48,12 +48,11 @@ static struct { #define add_dbg_module(dbg, name, id, initlevel) \ do { \ - struct dentry *d; \ dbg.dbg_module[id] = (initlevel); \ - d = debugfs_create_x8(name, 0600, dbg.dbgdir, \ - &(dbg.dbg_module[id])); \ - if (!IS_ERR(d)) \ - dbg.dbg_module_dentries[id] = d; \ + dbg.dbg_module_dentries[id] = \ + debugfs_create_x8(name, 0600, \ + dbg.dbgdir, \ + &(dbg.dbg_module[id])); \ } while (0) static int iwm_debugfs_u32_read(void *data, u64 *val) @@ -423,89 +422,29 @@ static const struct file_operations iwm_debugfs_fw_err_fops = { .read = iwm_debugfs_fw_err_read, }; -int iwm_debugfs_init(struct iwm_priv *iwm) +void iwm_debugfs_init(struct iwm_priv *iwm) { - int i, result; - char devdir[16]; + int i; iwm->dbg.rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL); - result = PTR_ERR(iwm->dbg.rootdir); - if (!result || IS_ERR(iwm->dbg.rootdir)) { - if (result == -ENODEV) { - IWM_ERR(iwm, "DebugFS (CONFIG_DEBUG_FS) not " - "enabled in kernel config\n"); - result = 0; /* No debugfs support */ - } - IWM_ERR(iwm, "Couldn't create rootdir: %d\n", result); - goto error; - } - - snprintf(devdir, sizeof(devdir), "%s", wiphy_name(iwm_to_wiphy(iwm))); - - iwm->dbg.devdir = debugfs_create_dir(devdir, iwm->dbg.rootdir); - result = PTR_ERR(iwm->dbg.devdir); - if (IS_ERR(iwm->dbg.devdir) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create devdir: %d\n", result); - goto error; - } - + iwm->dbg.devdir = debugfs_create_dir(wiphy_name(iwm_to_wiphy(iwm)), + iwm->dbg.rootdir); iwm->dbg.dbgdir = debugfs_create_dir("debug", iwm->dbg.devdir); - result = PTR_ERR(iwm->dbg.dbgdir); - if (IS_ERR(iwm->dbg.dbgdir) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create dbgdir: %d\n", result); - goto error; - } - iwm->dbg.rxdir = debugfs_create_dir("rx", iwm->dbg.devdir); - result = PTR_ERR(iwm->dbg.rxdir); - if (IS_ERR(iwm->dbg.rxdir) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create rx dir: %d\n", result); - goto error; - } - iwm->dbg.txdir = debugfs_create_dir("tx", iwm->dbg.devdir); - result = PTR_ERR(iwm->dbg.txdir); - if (IS_ERR(iwm->dbg.txdir) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create tx dir: %d\n", result); - goto error; - } - iwm->dbg.busdir = debugfs_create_dir("bus", iwm->dbg.devdir); - result = PTR_ERR(iwm->dbg.busdir); - if (IS_ERR(iwm->dbg.busdir) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create bus dir: %d\n", result); - goto error; - } - - if (iwm->bus_ops->debugfs_init) { - result = iwm->bus_ops->debugfs_init(iwm, iwm->dbg.busdir); - if (result < 0) { - IWM_ERR(iwm, "Couldn't create bus entry: %d\n", result); - goto error; - } - } - + if (iwm->bus_ops->debugfs_init) + iwm->bus_ops->debugfs_init(iwm, iwm->dbg.busdir); iwm->dbg.dbg_level = IWM_DL_NONE; iwm->dbg.dbg_level_dentry = debugfs_create_file("level", 0200, iwm->dbg.dbgdir, iwm, &fops_iwm_dbg_level); - result = PTR_ERR(iwm->dbg.dbg_level_dentry); - if (IS_ERR(iwm->dbg.dbg_level_dentry) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create dbg_level: %d\n", result); - goto error; - } - iwm->dbg.dbg_modules = IWM_DM_DEFAULT; iwm->dbg.dbg_modules_dentry = debugfs_create_file("modules", 0200, iwm->dbg.dbgdir, iwm, &fops_iwm_dbg_modules); - result = PTR_ERR(iwm->dbg.dbg_modules_dentry); - if (IS_ERR(iwm->dbg.dbg_modules_dentry) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create dbg_modules: %d\n", result); - goto error; - } for (i = 0; i < __IWM_DM_NR; i++) add_dbg_module(iwm->dbg, iwm_debug_module[i].name, @@ -514,44 +453,15 @@ int iwm_debugfs_init(struct iwm_priv *iwm) iwm->dbg.txq_dentry = debugfs_create_file("queues", 0200, iwm->dbg.txdir, iwm, &iwm_debugfs_txq_fops); - result = PTR_ERR(iwm->dbg.txq_dentry); - if (IS_ERR(iwm->dbg.txq_dentry) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create tx queue: %d\n", result); - goto error; - } - iwm->dbg.tx_credit_dentry = debugfs_create_file("credits", 0200, iwm->dbg.txdir, iwm, &iwm_debugfs_tx_credit_fops); - result = PTR_ERR(iwm->dbg.tx_credit_dentry); - if (IS_ERR(iwm->dbg.tx_credit_dentry) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create tx credit: %d\n", result); - goto error; - } - iwm->dbg.rx_ticket_dentry = debugfs_create_file("tickets", 0200, iwm->dbg.rxdir, iwm, &iwm_debugfs_rx_ticket_fops); - result = PTR_ERR(iwm->dbg.rx_ticket_dentry); - if (IS_ERR(iwm->dbg.rx_ticket_dentry) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create rx ticket: %d\n", result); - goto error; - } - iwm->dbg.fw_err_dentry = debugfs_create_file("last_fw_err", 0200, iwm->dbg.dbgdir, iwm, &iwm_debugfs_fw_err_fops); - result = PTR_ERR(iwm->dbg.fw_err_dentry); - if (IS_ERR(iwm->dbg.fw_err_dentry) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create last FW err: %d\n", result); - goto error; - } - - - return 0; - - error: - return result; } void iwm_debugfs_exit(struct iwm_priv *iwm) diff --git a/drivers/net/wireless/iwmc3200wifi/sdio.c b/drivers/net/wireless/iwmc3200wifi/sdio.c index 1eafd6d..1acea37 100644 --- a/drivers/net/wireless/iwmc3200wifi/sdio.c +++ b/drivers/net/wireless/iwmc3200wifi/sdio.c @@ -366,21 +366,13 @@ static const struct file_operations iwm_debugfs_sdio_fops = { .read = iwm_debugfs_sdio_read, }; -static int if_sdio_debugfs_init(struct iwm_priv *iwm, struct dentry *parent_dir) +static void if_sdio_debugfs_init(struct iwm_priv *iwm, struct dentry *parent_dir) { - int result; struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm); hw->cccr_dentry = debugfs_create_file("cccr", 0200, parent_dir, iwm, &iwm_debugfs_sdio_fops); - result = PTR_ERR(hw->cccr_dentry); - if (IS_ERR(hw->cccr_dentry) && (result != -ENODEV)) { - IWM_ERR(iwm, "Couldn't create CCCR entry: %d\n", result); - return result; - } - - return 0; } static void if_sdio_debugfs_exit(struct iwm_priv *iwm) @@ -440,11 +432,7 @@ static int iwm_sdio_probe(struct sdio_func *func, hw = iwm_private(iwm); hw->iwm = iwm; - ret = iwm_debugfs_init(iwm); - if (ret < 0) { - IWM_ERR(iwm, "Debugfs registration failed\n"); - goto if_free; - } + iwm_debugfs_init(iwm); sdio_set_drvdata(func, hw); @@ -473,7 +461,6 @@ static int iwm_sdio_probe(struct sdio_func *func, destroy_workqueue(hw->isr_wq); debugfs_exit: iwm_debugfs_exit(iwm); - if_free: iwm_if_free(iwm); return ret; }