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USB: usbmon: use simple_read_from_buffer()

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Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Akinobu Mita 2008-06-09 16:39:57 -07:00 committed by Greg Kroah-Hartman
parent bef4665a2e
commit 518386c7d4
1 changed files with 2 additions and 12 deletions
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14
drivers/usb/mon/mon_stat.c
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@ -9,6 +9,7 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/usb.h> #include <linux/usb.h>
#include <linux/fs.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include "usb_mon.h" #include "usb_mon.h"
@ -42,19 +43,8 @@ static ssize_t mon_stat_read(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos) size_t nbytes, loff_t *ppos)
{ {
struct snap *sp = file->private_data; struct snap *sp = file->private_data;
loff_t pos = *ppos;
int cnt;
if (pos < 0 || pos >= sp->slen) return simple_read_from_buffer(buf, nbytes, ppos, sp->str, sp->slen);
return 0;
if (nbytes == 0)
return 0;
if ((cnt = sp->slen - pos) > nbytes)
cnt = nbytes;
if (copy_to_user(buf, sp->str + pos, cnt))
return -EFAULT;
*ppos = pos + cnt;
return cnt;
} }
static int mon_stat_release(struct inode *inode, struct file *file) static int mon_stat_release(struct inode *inode, struct file *file)