linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * linux/drivers/scsi/scsi_proc.c

 *

 * The functions in this file provide an interface between

 * the PROC file system and the SCSI device drivers

 * It is mainly used for debugging, statistics and to pass 

 * information directly to the lowlevel driver.

 *

 * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de 

 * Version: 0.99.8   last change: 95/09/13

 * 

 * generic command parser provided by: 

 * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>

 *

 * generic_proc_info() support of xxxx_info() by:

 * Michael A. Griffith <grif@acm.org>

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/string.h>

#include <linux/mm.h>

#include <linux/proc_fs.h>

#include <linux/errno.h>

#include <linux/blkdev.h>

#include <linux/seq_file.h>

#include <linux/mutex.h>

#include <linux/gfp.h>

#include <linux/uaccess.h>

​

#include <scsi/scsi.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_host.h>

#include <scsi/scsi_transport.h>

​

#include "scsi_priv.h"

#include "scsi_logging.h"

​

​

/* 4K page size, but our output routines, use some slack for overruns */

#define PROC_BLOCK_SIZE (3*1024)

​

static struct proc_dir_entry *proc_scsi;

​

/* Protect sht->present and sht->proc_dir */

static DEFINE_MUTEX(global_host_template_mutex);

​

static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf,

                           size_t count, loff_t *ppos)

{

    struct Scsi_Host *shost = PDE_DATA(file_inode(file));

    ssize_t ret = -ENOMEM;

    char *page;

    if (count > PROC_BLOCK_SIZE)

        return -EOVERFLOW;

​

    if (!shost->hostt->write_info)

        return -EINVAL;

​

    page = (char *)__get_free_page(GFP_KERNEL);

    if (page) {