diff options
| author |   Takashi Iwai <tiwai@suse.de> | 2019-04-12 12:44:39 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-04-12 13:07:25 +0200 |
| commit | 6b580f523172f2c738b661069a57c23c74a75f88 (patch) | |
| tree | d772938f0958be15c9f097fecfdccc39609c9b7b /sound/core/seq/seq_clientmgr.h | |
| parent | ALSA: seq: Simplify snd_seq_kernel_client_enqueue() helper (diff) | |
| download | linux-dev-6b580f523172f2c738b661069a57c23c74a75f88.tar.xz linux-dev-6b580f523172f2c738b661069a57c23c74a75f88.zip | |
ALSA: seq: Protect racy pool manipulation from OSS sequencer
OSS sequencer emulation still allows to queue and issue the events
that manipulate the client pool concurrently in a racy way. This
patch serializes the access like the normal sequencer write / ioctl
via taking the client ioctl_mutex. Since the access to the sequencer
client is done indirectly via a client id number, a new helper to
take/release the mutex is introduced.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | sound/core/seq/seq_clientmgr.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/core/seq/seq_clientmgr.h b/sound/core/seq/seq_clientmgr.h index 66ad3d547916..28a51dcc0190 100644 --- a/sound/core/seq/seq_clientmgr.h +++ b/sound/core/seq/seq_clientmgr.h @@ -97,6 +97,10 @@ int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table int snd_seq_client_notify_subscription(int client, int port, struct snd_seq_port_subscribe *info, int evtype); +/* only for OSS sequencer */ +bool snd_seq_client_ioctl_lock(int clientid); +void snd_seq_client_ioctl_unlock(int clientid); + extern int seq_client_load[15]; #endif |