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[ALSA] Fix control/status mmap with shared PCM substream 

The flag to avoid 32bit-incompatible mmap for control/status records
should be outside the pcm substream instance since a substream can be
shared among multiple opens.  Now it's flagged in pcm_file list that
is directly assigned to file->private_data.
Also, removed snd_pcm_add_file() and remove_file() functions and
substream.files field that are not really used in the code.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2006-07-31 16:51:51 +02:00 committed by Jaroslav Kysela
parent 1c39855804
commit 548a648b98
3 changed files with 12 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/sound/pcm.h
View File

@ -190,7 +190,7 @@ struct snd_pcm_ops {
struct snd_pcm_file {
struct snd_pcm_substream *substream;
struct snd_pcm_file *next;
int no_compat_mmap;
};
struct snd_pcm_hw_rule;
@ -384,7 +384,6 @@ struct snd_pcm_substream {
struct snd_info_entry *proc_prealloc_entry;
#endif
/* misc flags */
unsigned int no_mmap_ctrl: 1;
unsigned int hw_opened: 1;
};
@ -402,7 +401,6 @@ struct snd_pcm_str {
/* -- OSS things -- */
struct snd_pcm_oss_stream oss;
#endif
struct snd_pcm_file *files;
#ifdef CONFIG_SND_VERBOSE_PROCFS
struct snd_info_entry *proc_root;
struct snd_info_entry *proc_info_entry;

2
sound/core/pcm_compat.c
View File

@ -478,7 +478,7 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
* mmap of PCM status/control records because of the size
* incompatibility.
*/
substream->no_mmap_ctrl = 1;
pcm_file->no_compat_mmap = 1;
switch (cmd) {
case SNDRV_PCM_IOCTL_PVERSION:

49
sound/core/pcm_native.c
View File

@ -1992,35 +1992,9 @@ int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
return 0;
}
static void snd_pcm_add_file(struct snd_pcm_str *str,
struct snd_pcm_file *pcm_file)
{
pcm_file->next = str->files;
str->files = pcm_file;
}
static void snd_pcm_remove_file(struct snd_pcm_str *str,
struct snd_pcm_file *pcm_file)
{
struct snd_pcm_file * pcm_file1;
if (str->files == pcm_file) {
str->files = pcm_file->next;
} else {
pcm_file1 = str->files;
while (pcm_file1 && pcm_file1->next != pcm_file)
pcm_file1 = pcm_file1->next;
if (pcm_file1 != NULL)
pcm_file1->next = pcm_file->next;
}
}
static void pcm_release_private(struct snd_pcm_substream *substream)
{
struct snd_pcm_file *pcm_file = substream->file;
snd_pcm_unlink(substream);
snd_pcm_remove_file(substream->pstr, pcm_file);
kfree(pcm_file);
}
void snd_pcm_release_substream(struct snd_pcm_substream *substream)
@ -2060,7 +2034,6 @@ int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
return 0;
}
substream->no_mmap_ctrl = 0;
err = snd_pcm_hw_constraints_init(substream);
if (err < 0) {
snd_printd("snd_pcm_hw_constraints_init failed\n");
@ -2105,19 +2078,16 @@ static int snd_pcm_open_file(struct file *file,
if (err < 0)
return err;
if (substream->ref_count > 1)
pcm_file = substream->file;
else {
pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
if (pcm_file == NULL) {
snd_pcm_release_substream(substream);
return -ENOMEM;
}
pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
if (pcm_file == NULL) {
snd_pcm_release_substream(substream);
return -ENOMEM;
}
pcm_file->substream = substream;
if (substream->ref_count == 1) {
str = substream->pstr;
substream->file = pcm_file;
substream->pcm_release = pcm_release_private;
pcm_file->substream = substream;
snd_pcm_add_file(str, pcm_file);
}
file->private_data = pcm_file;
*rpcm_file = pcm_file;
@ -2209,6 +2179,7 @@ static int snd_pcm_release(struct inode *inode, struct file *file)
fasync_helper(-1, file, 0, &substream->runtime->fasync);
mutex_lock(&pcm->open_mutex);
snd_pcm_release_substream(substream);
kfree(pcm_file);
mutex_unlock(&pcm->open_mutex);
wake_up(&pcm->open_wait);
module_put(pcm->card->module);
@ -3270,11 +3241,11 @@ static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
offset = area->vm_pgoff << PAGE_SHIFT;
switch (offset) {
case SNDRV_PCM_MMAP_OFFSET_STATUS:
if (substream->no_mmap_ctrl)
if (pcm_file->no_compat_mmap)
return -ENXIO;
return snd_pcm_mmap_status(substream, file, area);
case SNDRV_PCM_MMAP_OFFSET_CONTROL:
if (substream->no_mmap_ctrl)
if (pcm_file->no_compat_mmap)
return -ENXIO;
return snd_pcm_mmap_control(substream, file, area);
default: