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parisc: convert /proc/pdc/{lcd,led} to seq_file

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Convert code away from ->read_proc/->write_proc interfaces.
Switch to proc_create()/proc_create_data() which make addition of
proc entries reliable wrt NULL ->proc_fops, NULL ->data and so on.

Problem with ->read_proc et al is described here
commit 786d7e1612
"Fix rmmod/read/write races in /proc entries"

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
This commit is contained in:
Alexey Dobriyan 2009-11-27 06:51:12 +00:00 committed by Kyle McMartin
parent 05920797ca
commit 217bfb5190
1 changed files with 30 additions and 31 deletions
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61
drivers/parisc/led.c
View file

@ -38,6 +38,7 @@
#include <linux/kernel_stat.h>
#include <linux/reboot.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>
#include <linux/blkdev.h>
#include <linux/workqueue.h>
@ -147,41 +148,34 @@ device_initcall(start_task);
static void (*led_func_ptr) (unsigned char) __read_mostly;
#ifdef CONFIG_PROC_FS
static int led_proc_read(char *page, char **start, off_t off, int count,
int *eof, void *data)
static int led_proc_show(struct seq_file *m, void *v)
{
char *out = page;
int len;
switch ((long)data)
switch ((long)m->private)
{
case LED_NOLCD:
out += sprintf(out, "Heartbeat: %d\n", led_heartbeat);
out += sprintf(out, "Disk IO: %d\n", led_diskio);
out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx);
seq_printf(m, "Heartbeat: %d\n", led_heartbeat);
seq_printf(m, "Disk IO: %d\n", led_diskio);
seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx);
break;
case LED_HASLCD:
out += sprintf(out, "%s\n", lcd_text);
seq_printf(m, "%s\n", lcd_text);
break;
default:
*eof = 1;
return 0;
}
len = out - page - off;
if (len < count) {
*eof = 1;
if (len <= 0) return 0;
} else {
len = count;
}
*start = page + off;
return len;
return 0;
}
static int led_proc_write(struct file *file, const char *buf,
unsigned long count, void *data)
static int led_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, led_proc_show, PDE(inode)->data);
}
static ssize_t led_proc_write(struct file *file, const char *buf,
size_t count, loff_t *pos)
{
void *data = PDE(file->f_path.dentry->d_inode)->data;
char *cur, lbuf[count + 1];
int d;
@ -234,6 +228,15 @@ static int led_proc_write(struct file *file, const char *buf,
return -EINVAL;
}
static const struct file_operations led_proc_fops = {
.owner = THIS_MODULE,
.open = led_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = led_proc_write,
};
static int __init led_create_procfs(void)
{
struct proc_dir_entry *proc_pdc_root = NULL;
@ -243,19 +246,15 @@ static int __init led_create_procfs(void)
proc_pdc_root = proc_mkdir("pdc", 0);
if (!proc_pdc_root) return -1;
ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root,
&led_proc_fops, (void *)LED_NOLCD); /* LED */
if (!ent) return -1;
ent->data = (void *)LED_NOLCD; /* LED */
ent->read_proc = led_proc_read;
ent->write_proc = led_proc_write;
if (led_type == LED_HASLCD)
{
ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root,
&led_proc_fops, (void *)LED_HASLCD); /* LCD */
if (!ent) return -1;
ent->data = (void *)LED_HASLCD; /* LCD */
ent->read_proc = led_proc_read;
ent->write_proc = led_proc_write;
}
return 0;