[ALSA] Make buffer size of proc text interface variable
Make the read/write buffer size of proc text interface variable.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/info.h b/include/sound/info.h
index f23d838..4812843 100644
--- a/include/sound/info.h
+++ b/include/sound/info.h
@@ -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 */
};
diff --git a/sound/core/info.c b/sound/core/info.c
index 9c28853..86366839 100644
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -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_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 @@
{
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 @@
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 @@
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 @@
}
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 @@
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 @@
}
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 @@
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 @@
data->wbuffer->error);
}
}
- vfree(data->wbuffer->buffer);
+ kfree(data->wbuffer->buffer);
kfree(data->wbuffer);
}
break;
@@ -668,24 +680,22 @@
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 @@
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);