From: Len Bao <len.bao@gmx.us>
Date: Sun, 24 May 2026 16:52:48 +0000 (+0000)
Subject: ALSA: drivers: Mark some variables as __ro_after_init
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d1d092b8df9aa3c45a58a22e13b92afa850146f;p=thirdparty%2Flinux.git

ALSA: drivers: Mark some variables as __ro_after_init

Some variables in the 'ALSA/drivers' are initialized only during the
init phase in the '__init' functions and never changed. So, mark them
as __ro_after_init to reduce the attack surface.

Signed-off-by: Len Bao <len.bao@gmx.us>
Link: https://patch.msgid.link/20260524165249.48941-1-len.bao@gmx.us
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/drivers/mpu401/mpu401.c b/sound/drivers/mpu401/mpu401.c
index d3f9424088d4f..b615a310c79ae 100644
--- a/sound/drivers/mpu401/mpu401.c
+++ b/sound/drivers/mpu401/mpu401.c
@@ -46,7 +46,7 @@ module_param_array(uart_enter, bool, NULL, 0444);
 MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
 
 static struct platform_device *platform_devices[SNDRV_CARDS];
-static int pnp_registered;
+static int pnp_registered __ro_after_init;
 static unsigned int snd_mpu401_devices;
 
 static int snd_mpu401_create(struct device *devptr, int dev,
diff --git a/sound/drivers/pcmtest.c b/sound/drivers/pcmtest.c
index 7f93557b51eca..5d5281e4deb7c 100644
--- a/sound/drivers/pcmtest.c
+++ b/sound/drivers/pcmtest.c
@@ -113,7 +113,7 @@ struct pcmtst_buf_iter {
 	struct timer_list timer_instance;
 };
 
-static struct snd_pcm_hardware snd_pcmtst_hw = {
+static struct snd_pcm_hardware snd_pcmtst_hw __ro_after_init = {
 	.info = (SNDRV_PCM_INFO_INTERLEAVED |
 		 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 		 SNDRV_PCM_INFO_NONINTERLEAVED |
@@ -137,7 +137,7 @@ struct pattern_buf {
 	u32 len;
 };
 
-static int buf_allocated;
+static int buf_allocated __ro_after_init;
 static struct pattern_buf patt_bufs[MAX_CHANNELS_NUM];
 
 static inline void inc_buf_pos(struct pcmtst_buf_iter *v_iter, size_t by, size_t bytes)