sound_firmware.c

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#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
#include "oss/sound_firmware.h"

static int do_mod_firmware_load(const char *fn, char **fp)
{
    struct file* filp;
    long l;
    char *dp;
    loff_t pos;

    filp = filp_open(fn, 0, 0);
    if (IS_ERR(filp))
    {
        printk(KERN_INFO "Unable to load '%s'.\n", fn);
        return 0;
    }
    l = i_size_read(filp->f_path.dentry->d_inode);
    if (l <= 0 || l > 131072)
    {
        printk(KERN_INFO "Invalid firmware '%s'\n", fn);
        filp_close(filp, NULL);
        return 0;
    }
    dp = vmalloc(l);
    if (dp == NULL)
    {
        printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
        filp_close(filp, NULL);
        return 0;
    }
    pos = 0;
    if (vfs_read(filp, dp, l, &pos) != l)
    {
        printk(KERN_INFO "Failed to read '%s'.\n", fn);
        vfree(dp);
        filp_close(filp, NULL);
        return 0;
    }
    filp_close(filp, NULL);
    *fp = dp;
    return (int) l;
}

int mod_firmware_load(const char *fn, char **fp)
{
    int r;
    mm_segment_t fs = get_fs();

    set_fs(get_ds());
    r = do_mod_firmware_load(fn, fp);
    set_fs(fs);
    return r;
}
EXPORT_SYMBOL(mod_firmware_load);

MODULE_LICENSE("GPL");