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iwlwifi: mvm: refactor debugfs copy_from_user() 

Abstract the copy_from_user() pattern into the macros defining
debugfs files, reducing the code and making adding new files
safer by avoiding having deal with copy_from_user() directly.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Johannes Berg 2013-11-13 09:10:21 +01:00 committed by Emmanuel Grumbach
parent 7f09d70436
commit 1fa3f57a1c
2 changed files with 43 additions and 69 deletions
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87
drivers/net/wireless/iwlwifi/mvm/debugfs.c
View File

@ -66,22 +66,15 @@
#include "iwl-prph.h"
#include "debugfs.h"
static ssize_t iwl_dbgfs_tx_flush_write(struct file *file,
const char __user *user_buf,
static ssize_t iwl_dbgfs_tx_flush_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
char buf[16] = {};
size_t buf_size = min(count, sizeof(buf) - 1);
int ret;
u32 scd_q_msk;
if (!mvm->ucode_loaded || mvm->cur_ucode != IWL_UCODE_REGULAR)
return -EIO;
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%x", &scd_q_msk) != 1)
return -EINVAL;
@ -94,22 +87,15 @@ static ssize_t iwl_dbgfs_tx_flush_write(struct file *file,
return ret;
}
static ssize_t iwl_dbgfs_sta_drain_write(struct file *file,
const char __user *user_buf,
static ssize_t iwl_dbgfs_sta_drain_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
struct ieee80211_sta *sta;
char buf[8] = {};
size_t buf_size = min(count, sizeof(buf) - 1);
int sta_id, drain, ret;
if (!mvm->ucode_loaded || mvm->cur_ucode != IWL_UCODE_REGULAR)
return -EIO;
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%d %d", &sta_id, &drain) != 2)
return -EINVAL;
if (sta_id < 0 || sta_id >= IWL_MVM_STATION_COUNT)
@ -187,18 +173,11 @@ static ssize_t iwl_dbgfs_sram_read(struct file *file, char __user *user_buf,
return ret;
}
static ssize_t iwl_dbgfs_sram_write(struct file *file,
const char __user *user_buf, size_t count,
loff_t *ppos)
static ssize_t iwl_dbgfs_sram_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
char buf[64] = {};
size_t buf_size = min(count, sizeof(buf) - 1);
u32 offset, len;
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%x,%x", &offset, &len) == 2) {
if ((offset & 0x3) || (len & 0x3))
return -EINVAL;
@ -258,22 +237,14 @@ static ssize_t iwl_dbgfs_disable_power_off_read(struct file *file,
return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
}
static ssize_t iwl_dbgfs_disable_power_off_write(struct file *file,
const char __user *user_buf,
static ssize_t iwl_dbgfs_disable_power_off_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
char buf[64] = {};
size_t buf_size = min(count, sizeof(buf) - 1);
int ret;
int val;
int ret, val;
if (!mvm->ucode_loaded)
return -EIO;
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (!strncmp("disable_power_off_d0=", buf, 21)) {
if (sscanf(buf + 21, "%d", &val) != 1)
return -EINVAL;
@ -568,11 +539,9 @@ static ssize_t iwl_dbgfs_fw_rx_stats_read(struct file *file,
}
#undef PRINT_STAT_LE32
static ssize_t iwl_dbgfs_fw_restart_write(struct file *file,
const char __user *user_buf,
static ssize_t iwl_dbgfs_fw_restart_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
int ret;
mutex_lock(&mvm->mutex);
@ -589,12 +558,9 @@ static ssize_t iwl_dbgfs_fw_restart_write(struct file *file,
return count;
}
static ssize_t iwl_dbgfs_fw_nmi_write(struct file *file,
const char __user *user_buf,
static ssize_t iwl_dbgfs_fw_nmi_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
iwl_write_prph(mvm->trans, DEVICE_SET_NMI_REG, 1);
return count;
@ -624,17 +590,11 @@ iwl_dbgfs_scan_ant_rxchain_read(struct file *file,
}
static ssize_t
iwl_dbgfs_scan_ant_rxchain_write(struct file *file,
const char __user *user_buf,
iwl_dbgfs_scan_ant_rxchain_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
char buf[8] = {};
size_t buf_size = min(count, sizeof(buf) - 1);
u8 scan_rx_ant;
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%hhx", &scan_rx_ant) != 1)
return -EINVAL;
if (scan_rx_ant > ANT_ABC)
@ -648,18 +608,11 @@ iwl_dbgfs_scan_ant_rxchain_write(struct file *file,
}
#ifdef CONFIG_PM_SLEEP
static ssize_t iwl_dbgfs_d3_sram_write(struct file *file,
const char __user *user_buf,
static ssize_t iwl_dbgfs_d3_sram_write(struct iwl_mvm *mvm, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
char buf[8] = {};
size_t buf_size = min(count, sizeof(buf) - 1);
int store;
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%d", &store) != 1)
return -EINVAL;
@ -712,6 +665,10 @@ static ssize_t iwl_dbgfs_d3_sram_read(struct file *file, char __user *user_buf,
}
#endif
#define MVM_DEBUGFS_WRITE_FILE_OPS(name, bufsz) \
_MVM_DEBUGFS_WRITE_FILE_OPS(name, bufsz, struct iwl_mvm)
#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
_MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_mvm)
#define MVM_DEBUGFS_ADD_FILE(name, parent, mode) do { \
if (!debugfs_create_file(#name, mode, parent, mvm, \
&iwl_dbgfs_##name##_ops)) \
@ -719,20 +676,20 @@ static ssize_t iwl_dbgfs_d3_sram_read(struct file *file, char __user *user_buf,
} while (0)
/* Device wide debugfs entries */
MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush);
MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(sram);
MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush, 16);
MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain, 8);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(sram, 64);
MVM_DEBUGFS_READ_FILE_OPS(stations);
MVM_DEBUGFS_READ_FILE_OPS(bt_notif);
MVM_DEBUGFS_READ_FILE_OPS(bt_cmd);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(disable_power_off);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(disable_power_off, 64);
MVM_DEBUGFS_READ_FILE_OPS(fw_rx_stats);
MVM_DEBUGFS_WRITE_FILE_OPS(fw_restart);
MVM_DEBUGFS_WRITE_FILE_OPS(fw_nmi);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(scan_ant_rxchain);
MVM_DEBUGFS_WRITE_FILE_OPS(fw_restart, 10);
MVM_DEBUGFS_WRITE_FILE_OPS(fw_nmi, 10);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(scan_ant_rxchain, 8);
#ifdef CONFIG_PM_SLEEP
MVM_DEBUGFS_READ_WRITE_FILE_OPS(d3_sram);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(d3_sram, 8);
#endif
int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)

25
drivers/net/wireless/iwlwifi/mvm/debugfs.h
View File

@ -68,17 +68,34 @@ static const struct file_operations iwl_dbgfs_##name##_ops = { \
.llseek = generic_file_llseek, \
}
#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name) \
#define MVM_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype) \
static ssize_t _iwl_dbgfs_##name##_write(struct file *file, \
const char __user *user_buf, \
size_t count, loff_t *ppos) \
{ \
argtype *arg = file->private_data; \
char buf[buflen] = {}; \
size_t buf_size = min(count, sizeof(buf) - 1); \
\
if (copy_from_user(buf, user_buf, buf_size)) \
return -EFAULT; \
\
return iwl_dbgfs_##name##_write(arg, buf, buf_size, ppos); \
} \
#define _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, buflen, argtype) \
MVM_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype) \
static const struct file_operations iwl_dbgfs_##name##_ops = { \
.write = iwl_dbgfs_##name##_write, \
.write = _iwl_dbgfs_##name##_write, \
.read = iwl_dbgfs_##name##_read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
};
#define MVM_DEBUGFS_WRITE_FILE_OPS(name) \
#define _MVM_DEBUGFS_WRITE_FILE_OPS(name, buflen, argtype) \
MVM_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype) \
static const struct file_operations iwl_dbgfs_##name##_ops = { \
.write = iwl_dbgfs_##name##_write, \
.write = _iwl_dbgfs_##name##_write, \
.open = simple_open, \
.llseek = generic_file_llseek, \
};