mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 07:45:06 +07:00
4c08ccf0dc
We should not be doing assignments within an if () block so fix up the code to not do this. change was created using Coccinelle. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Felipe Balbi <balbi@ti.com>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
|
|
* The USB Monitor, inspired by Dave Harding's USBMon.
|
|
*
|
|
* This is the 's' or 'stat' reader which debugs usbmon itself.
|
|
* Note that this code blows through locks, so make sure that
|
|
* /dbg/usbmon/0s is well protected from non-root users.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/export.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/fs.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "usb_mon.h"
|
|
|
|
#define STAT_BUF_SIZE 80
|
|
|
|
struct snap {
|
|
int slen;
|
|
char str[STAT_BUF_SIZE];
|
|
};
|
|
|
|
static int mon_stat_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct mon_bus *mbus;
|
|
struct snap *sp;
|
|
|
|
sp = kmalloc(sizeof(struct snap), GFP_KERNEL);
|
|
if (sp == NULL)
|
|
return -ENOMEM;
|
|
|
|
mbus = inode->i_private;
|
|
|
|
sp->slen = snprintf(sp->str, STAT_BUF_SIZE,
|
|
"nreaders %d events %u text_lost %u\n",
|
|
mbus->nreaders, mbus->cnt_events, mbus->cnt_text_lost);
|
|
|
|
file->private_data = sp;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t mon_stat_read(struct file *file, char __user *buf,
|
|
size_t nbytes, loff_t *ppos)
|
|
{
|
|
struct snap *sp = file->private_data;
|
|
|
|
return simple_read_from_buffer(buf, nbytes, ppos, sp->str, sp->slen);
|
|
}
|
|
|
|
static int mon_stat_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct snap *sp = file->private_data;
|
|
file->private_data = NULL;
|
|
kfree(sp);
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations mon_fops_stat = {
|
|
.owner = THIS_MODULE,
|
|
.open = mon_stat_open,
|
|
.llseek = no_llseek,
|
|
.read = mon_stat_read,
|
|
/* .write = mon_stat_write, */
|
|
/* .poll = mon_stat_poll, */
|
|
/* .unlocked_ioctl = mon_stat_ioctl, */
|
|
.release = mon_stat_release,
|
|
};
|