linux-kernel - [PATCH 18/36] ALSA: seq: Treat snd_seq_client object directly in client drivers

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Message-Id: <20230519093114.28813-19-tiwai@suse.de>
Date:   Fri, 19 May 2023 11:30:56 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 18/36] ALSA: seq: Treat snd_seq_client object directly in client drivers

Introduce the new helpers, snd_seq_kernel_client_get() and _put() for
kernel client drivers to treat the snd_seq_client more directly.
This allows us to reduce the exported symbols and APIs at each time we
need to access some field in future.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 sound/core/seq/seq_clientmgr.c | 15 +++++++++++++++
 sound/core/seq/seq_clientmgr.h |  4 ++++
 2 files changed, 19 insertions(+)

diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 2d707afa1ef1..98e8032a32e2 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -2390,6 +2390,21 @@ int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table
 }
 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
 
+/* get a sequencer client object; for internal use from a kernel client */
+struct snd_seq_client *snd_seq_kernel_client_get(int id)
+{
+	return snd_seq_client_use_ptr(id);
+}
+EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get);
+
+/* put a sequencer client object; for internal use from a kernel client */
+void snd_seq_kernel_client_put(struct snd_seq_client *cptr)
+{
+	if (cptr)
+		snd_seq_client_unlock(cptr);
+}
+EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put);
+
 /*---------------------------------------------------------------------------*/
 
 #ifdef CONFIG_SND_PROC_FS
diff --git a/sound/core/seq/seq_clientmgr.h b/sound/core/seq/seq_clientmgr.h
index 8cdd0ee53fb1..f05704e45ab4 100644
--- a/sound/core/seq/seq_clientmgr.h
+++ b/sound/core/seq/seq_clientmgr.h
@@ -88,4 +88,8 @@ void snd_seq_client_ioctl_unlock(int clientid);
 
 extern int seq_client_load[15];
 
+/* for internal use between kernel sequencer clients */
+struct snd_seq_client *snd_seq_kernel_client_get(int client);
+void snd_seq_kernel_client_put(struct snd_seq_client *cptr);
+
 #endif
-- 
2.35.3