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ALSA: seq: Avoid client data changes during proc reads

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The proc read of each client should protect against the concurrent
data changes to keep the data consistent; although they are supposed
to be safe and won't crash things, it doesn't guarantee the
consistency between the read values.  Take client->ioctl_mutex for
protecting against the concurrent changes.

Link: https://patch.msgid.link/20250307084246.29271-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2025-03-07 09:42:43 +01:00
parent e3cd33ab17
commit ef749c8d95
1 changed files with 2 additions and 0 deletions
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2
sound/core/seq/seq_clientmgr.c
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@@ -2706,6 +2706,7 @@ void snd_seq_info_clients_read(struct snd_info_entry *entry,
continue;
}
mutex_lock(&client->ioctl_mutex);
snd_iprintf(buffer, "Client %3d : \"%s\" [%s %s]\n",
c, client->name,
client->type == USER_CLIENT ? "User" : "Kernel",
@@ -2723,6 +2724,7 @@ void snd_seq_info_clients_read(struct snd_info_entry *entry,
snd_iprintf(buffer, " Input pool :\n");
snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
}
mutex_unlock(&client->ioctl_mutex);
snd_seq_client_unlock(client);
}
}