f940fcd8ea
With module.h being implicitly everywhere via device.h, the absence of explicitly including something for EXPORT_SYMBOL went unnoticed. Since we are heading to fix things up and clean module.h from the device.h file, we need to explicitly include these files now. Use the lightweight version of the header that has just THIS_MODULE and EXPORT_SYMBOL variants. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
/*
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* The USB Monitor, inspired by Dave Harding's USBMon.
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*
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* This is the 's' or 'stat' reader which debugs usbmon itself.
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* Note that this code blows through locks, so make sure that
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* /dbg/usbmon/0s is well protected from non-root users.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/usb.h>
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#include <linux/fs.h>
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#include <asm/uaccess.h>
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#include "usb_mon.h"
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#define STAT_BUF_SIZE 80
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struct snap {
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int slen;
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char str[STAT_BUF_SIZE];
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};
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static int mon_stat_open(struct inode *inode, struct file *file)
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{
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struct mon_bus *mbus;
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struct snap *sp;
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if ((sp = kmalloc(sizeof(struct snap), GFP_KERNEL)) == NULL)
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return -ENOMEM;
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mbus = inode->i_private;
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sp->slen = snprintf(sp->str, STAT_BUF_SIZE,
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"nreaders %d events %u text_lost %u\n",
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mbus->nreaders, mbus->cnt_events, mbus->cnt_text_lost);
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file->private_data = sp;
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return 0;
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}
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static ssize_t mon_stat_read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct snap *sp = file->private_data;
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return simple_read_from_buffer(buf, nbytes, ppos, sp->str, sp->slen);
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}
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static int mon_stat_release(struct inode *inode, struct file *file)
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{
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struct snap *sp = file->private_data;
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file->private_data = NULL;
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kfree(sp);
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return 0;
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}
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const struct file_operations mon_fops_stat = {
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.owner = THIS_MODULE,
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.open = mon_stat_open,
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.llseek = no_llseek,
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.read = mon_stat_read,
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/* .write = mon_stat_write, */
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/* .poll = mon_stat_poll, */
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/* .unlocked_ioctl = mon_stat_ioctl, */
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.release = mon_stat_release,
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};
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