cregit-Linux how code gets into the kernel

Release 4.7 sound/sound_firmware.c

Directory: sound
#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; 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; } if (kernel_read(filp, 0, dp, l) != l) { printk(KERN_INFO "Failed to read '%s'.\n", fn); vfree(dp); fput(filp); return 0; } fput(filp); *fp = dp; return (int) l; }


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/** * 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");

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Directory: sound
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