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Convert snd-page-alloc proc file to use seq_file

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Use seq_file for the proc file read/write of snd-page-alloc module.
This automatically fixes bugs in the old proc code.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Takashi Iwai 2007-09-17 21:55:10 +02:00 committed by Linus Torvalds
parent 7bae705ef2
commit ccec6e2c4a
1 changed files with 39 additions and 29 deletions
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68
sound/core/memalloc.c
View file

@ -27,6 +27,7 @@
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>
@ -481,53 +482,54 @@ static void free_all_reserved_pages(void)
#define SND_MEM_PROC_FILE "driver/snd-page-alloc"
static struct proc_dir_entry *snd_mem_proc;
static int snd_mem_proc_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
static int snd_mem_proc_read(struct seq_file *seq, void *offset)
{
int len = 0;
long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
struct snd_mem_list *mem;
int devno;
static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" };
mutex_lock(&list_mutex);
len += snprintf(page + len, count - len,
"pages : %li bytes (%li pages per %likB)\n",
pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n",
pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
devno = 0;
list_for_each_entry(mem, &mem_list_head, list) {
devno++;
len += snprintf(page + len, count - len,
"buffer %d : ID %08x : type %s\n",
devno, mem->id, types[mem->buffer.dev.type]);
len += snprintf(page + len, count - len,
" addr = 0x%lx, size = %d bytes\n",
(unsigned long)mem->buffer.addr, (int)mem->buffer.bytes);
seq_printf(seq, "buffer %d : ID %08x : type %s\n",
devno, mem->id, types[mem->buffer.dev.type]);
seq_printf(seq, " addr = 0x%lx, size = %d bytes\n",
(unsigned long)mem->buffer.addr,
(int)mem->buffer.bytes);
}
mutex_unlock(&list_mutex);
return len;
return 0;
}
static int snd_mem_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, snd_mem_proc_read, NULL);
}
/* FIXME: for pci only - other bus? */
#ifdef CONFIG_PCI
#define gettoken(bufp) strsep(bufp, " \t\n")
static int snd_mem_proc_write(struct file *file, const char __user *buffer,
unsigned long count, void *data)
static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
size_t count, loff_t * ppos)
{
char buf[128];
char *token, *p;
if (count > ARRAY_SIZE(buf) - 1)
count = ARRAY_SIZE(buf) - 1;
if (count > sizeof(buf) - 1)
return -EINVAL;
if (copy_from_user(buf, buffer, count))
return -EFAULT;
buf[ARRAY_SIZE(buf) - 1] = '\0';
buf[count] = '\0';
p = buf;
token = gettoken(&p);
if (! token || *token == '#')
return (int)count;
return count;
if (strcmp(token, "add") == 0) {
char *endp;
int vendor, device, size, buffers;
@ -548,7 +550,7 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer,
(buffers = simple_strtol(token, NULL, 0)) <= 0 ||
buffers > 4) {
printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
return (int)count;
return count;
}
vendor &= 0xffff;
device &= 0xffff;
@ -560,7 +562,7 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer,
if (pci_set_dma_mask(pci, mask) < 0 ||
pci_set_consistent_dma_mask(pci, mask) < 0) {
printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
return (int)count;
return count;
}
}
for (i = 0; i < buffers; i++) {
@ -570,7 +572,7 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer,
size, &dmab) < 0) {
printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
pci_dev_put(pci);
return (int)count;
return count;
}
snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
}
@ -596,9 +598,21 @@ static int snd_mem_proc_write(struct file *file, const char __user *buffer,
free_all_reserved_pages();
else
printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
return (int)count;
return count;
}
#endif /* CONFIG_PCI */
static const struct file_operations snd_mem_proc_fops = {
.owner = THIS_MODULE,
.open = snd_mem_proc_open,
.read = seq_read,
#ifdef CONFIG_PCI
.write = snd_mem_proc_write,
#endif
.llseek = seq_lseek,
.release = single_release,
};
#endif /* CONFIG_PROC_FS */
/*
@ -609,12 +623,8 @@ static int __init snd_mem_init(void)
{
#ifdef CONFIG_PROC_FS
snd_mem_proc = create_proc_entry(SND_MEM_PROC_FILE, 0644, NULL);
if (snd_mem_proc) {
snd_mem_proc->read_proc = snd_mem_proc_read;
#ifdef CONFIG_PCI
snd_mem_proc->write_proc = snd_mem_proc_write;
#endif
}
if (snd_mem_proc)
snd_mem_proc->proc_fops = &snd_mem_proc_fops;
#endif
return 0;
}