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Tip revision: 1795cd9b3a91d4b5473c97f491d63892442212ab authored by Linus Torvalds on 13 July 2014, 21:04:33 UTC
Linux 3.16-rc5
Linux 3.16-rc5
Tip revision: 1795cd9
sound_firmware.c
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/file.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(file_inode(filp));
if (l <= 0 || l > 131072)
{
printk(KERN_INFO "Invalid firmware '%s'\n", fn);
fput(filp);
return 0;
}
dp = vmalloc(l);
if (dp == NULL)
{
printk(KERN_INFO "Out of memory loading '%s'.\n", fn);
fput(filp);
return 0;
}
pos = 0;
if (vfs_read(filp, dp, l, &pos) != l)
{
printk(KERN_INFO "Failed to read '%s'.\n", fn);
vfree(dp);
fput(filp);
return 0;
}
fput(filp);
*fp = dp;
return (int) l;
}
/**
* mod_firmware_load - load sound driver firmware
* @fn: filename
* @fp: return for the buffer.
*
* Load the firmware for a sound module (up to 128K) into a buffer.
* The buffer is returned in *fp. It is allocated with vmalloc so is
* virtually linear and not DMAable. The caller should free it with
* vfree when finished.
*
* The length of the buffer is returned on a successful load, the
* value zero on a failure.
*
* Caution: This API is not recommended. Firmware should be loaded via
* request_firmware.
*/
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");