jenna
/
kernel_samsung_sm7125
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ALSA] Make buffer size of proc text interface variable

Browse Source 
Make the read/write buffer size of proc text interface variable.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
tirimbino
Takashi Iwai 19 years ago committed by Jaroslav Kysela
parent 2f4ca8e5c7
commit 7e4eeec8a3
2 changed files with 82 additions and 73 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 6
      include/sound/info.h
  2. 149
      sound/core/info.c

6
include/sound/info.h
Unescape View File

@ -27,9 +27,9 @@
/* buffer for information */
struct snd_info_buffer {
char *buffer; /* pointer to begin of buffer */
char *curr; /* current position in buffer */
unsigned long size; /* current size */
unsigned long len; /* total length of buffer */
unsigned int curr; /* current position in buffer */
unsigned int size; /* current size */
unsigned int len; /* total length of buffer */
int stop; /* stop flag */
int error; /* error code */
};

149
sound/core/info.c
Unescape View File

@ -21,7 +21,6 @@
#include <sound/driver.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/time.h>
#include <linux/smp_lock.h>
#include <linux/string.h>
@ -82,6 +81,24 @@ static int snd_info_version_init(void);
static int snd_info_version_done(void);
/* resize the proc r/w buffer */
static int resize_info_buffer(struct snd_info_buffer *buffer,
unsigned int nsize)
{
char *nbuf;
nsize = PAGE_ALIGN(nsize);
nbuf = kmalloc(nsize, GFP_KERNEL);
if (! nbuf)
return -ENOMEM;
memcpy(nbuf, buffer->buffer, buffer->len);
kfree(buffer->buffer);
buffer->buffer = nbuf;
buffer->len = nsize;
return 0;
}
/**
* snd_iprintf - printf on the procfs buffer
* @buffer: the procfs buffer
@ -95,17 +112,25 @@ int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...)
{
va_list args;
int len, res;
int err = 0;
if (buffer->stop || buffer->error)
return 0;
len = buffer->len - buffer->size;
va_start(args, fmt);
res = vsnprintf(buffer->curr, len, fmt, args);
va_end(args);
if (res >= len) {
buffer->stop = 1;
return 0;
for (;;) {
res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, args);
if (res < len)
break;
err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
if (err < 0)
break;
len = buffer->len - buffer->size;
}
va_end(args);
if (err < 0)
return err;
buffer->curr += res;
buffer->size += res;
return res;
@ -225,7 +250,7 @@ static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer
struct snd_info_private_data *data;
struct snd_info_entry *entry;
struct snd_info_buffer *buf;
size_t size = 0;
ssize_t size = 0;
loff_t pos;
data = file->private_data;
@ -241,14 +266,20 @@ static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer
buf = data->wbuffer;
if (buf == NULL)
return -EIO;
if (pos >= buf->len)
return -ENOMEM;
size = buf->len - pos;
size = min(count, size);
if (copy_from_user(buf->buffer + pos, buffer, size))
mutex_unlock(&entry->access);
if (pos + count >= buf->len) {
if (resize_info_buffer(buf, pos + count)) {
mutex_unlock(&entry->access);
return -ENOMEM;
}
}
if (copy_from_user(buf->buffer + pos, buffer, count)) {
mutex_unlock(&entry->access);
return -EFAULT;
if ((long)buf->size < pos + size)
buf->size = pos + size;
}
buf->size = pos + count;
mutex_unlock(&entry->access);
size = count;
break;
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->write)
@ -283,18 +314,14 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
}
mode = file->f_flags & O_ACCMODE;
if (mode == O_RDONLY || mode == O_RDWR) {
if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
!entry->c.text.read_size) ||
(entry->content == SNDRV_INFO_CONTENT_DATA &&
if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
entry->c.ops->read == NULL)) {
err = -ENODEV;
goto __error;
}
}
if (mode == O_WRONLY || mode == O_RDWR) {
if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
!entry->c.text.write_size) ||
(entry->content == SNDRV_INFO_CONTENT_DATA &&
if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
entry->c.ops->write == NULL)) {
err = -ENODEV;
goto __error;
@ -310,49 +337,23 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
case SNDRV_INFO_CONTENT_TEXT:
if (mode == O_RDONLY || mode == O_RDWR) {
buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
if (buffer == NULL) {
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->len = (entry->c.text.read_size +
(PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
buffer->buffer = vmalloc(buffer->len);
if (buffer->buffer == NULL) {
kfree(buffer);
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->curr = buffer->buffer;
if (buffer == NULL)
goto __nomem;
data->rbuffer = buffer;
buffer->len = PAGE_SIZE;
buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
if (buffer->buffer == NULL)
goto __nomem;
}
if (mode == O_WRONLY || mode == O_RDWR) {
buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
if (buffer == NULL) {
if (mode == O_RDWR) {
vfree(data->rbuffer->buffer);
kfree(data->rbuffer);
}
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->len = (entry->c.text.write_size +
(PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
buffer->buffer = vmalloc(buffer->len);
if (buffer->buffer == NULL) {
if (mode == O_RDWR) {
vfree(data->rbuffer->buffer);
kfree(data->rbuffer);
}
kfree(buffer);
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->curr = buffer->buffer;
if (buffer == NULL)
goto __nomem;
data->wbuffer = buffer;
buffer->len = PAGE_SIZE;
buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
if (buffer->buffer == NULL)
goto __nomem;
}
break;
case SNDRV_INFO_CONTENT_DATA: /* data */
@ -377,6 +378,17 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
}
return 0;
__nomem:
if (data->rbuffer) {
kfree(data->rbuffer->buffer);
kfree(data->rbuffer);
}
if (data->wbuffer) {
kfree(data->wbuffer->buffer);
kfree(data->wbuffer);
}
kfree(data);
err = -ENOMEM;
__error:
module_put(entry->module);
__error1:
@ -395,11 +407,11 @@ static int snd_info_entry_release(struct inode *inode, struct file *file)
entry = data->entry;
switch (entry->content) {
case SNDRV_INFO_CONTENT_TEXT:
if (mode == O_RDONLY || mode == O_RDWR) {
vfree(data->rbuffer->buffer);
if (data->rbuffer) {
kfree(data->rbuffer->buffer);
kfree(data->rbuffer);
}
if (mode == O_WRONLY || mode == O_RDWR) {
if (data->wbuffer) {
if (entry->c.text.write) {
entry->c.text.write(entry, data->wbuffer);
if (data->wbuffer->error) {
@ -408,7 +420,7 @@ static int snd_info_entry_release(struct inode *inode, struct file *file)
data->wbuffer->error);
}
}
vfree(data->wbuffer->buffer);
kfree(data->wbuffer->buffer);
kfree(data->wbuffer);
}
break;
@ -668,24 +680,22 @@ int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
if (len <= 0 || buffer->stop || buffer->error)
return 1;
while (--len > 0) {
c = *buffer->curr++;
c = buffer->buffer[buffer->curr++];
if (c == '\n') {
if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
if (buffer->curr >= buffer->size)
buffer->stop = 1;
}
break;
}
*line++ = c;
if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
if (buffer->curr >= buffer->size) {
buffer->stop = 1;
break;
}
}
while (c != '\n' && !buffer->stop) {
c = *buffer->curr++;
if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
c = buffer->buffer[buffer->curr++];
if (buffer->curr >= buffer->size)
buffer->stop = 1;
}
}
*line = '\0';
return 0;
@ -978,7 +988,6 @@ static int __init snd_info_version_init(void)
entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
if (entry == NULL)
return -ENOMEM;
entry->c.text.read_size = 256;
entry->c.text.read = snd_info_version_read;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);

Write Preview
Loading…
Cancel
Save