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From 4be98b29d123fc7615ea8404fbda450ec8acb084 Mon Sep 17 00:00:00 2001
From: Joerg Schambacher <joerg@i2audio.com>
Date: Fri, 16 Oct 2020 15:17:07 +0200
Subject: [PATCH] Fixes a problem when module probes before i2c module
is available
The driver crashed while a NULL pointer returned by i2c_get_adapter()
has been used to access the i2c bus functions.
The headphone probing function hb_hp_probe() now returns -EPROBE_DEFER
in case the i2c module has not been loaded yet.
Signed-off-by: Joerg Schambacher <joerg@i2audio.com>
---
sound/soc/bcm/hifiberry_dacplus.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/sound/soc/bcm/hifiberry_dacplus.c
+++ b/sound/soc/bcm/hifiberry_dacplus.c
@@ -315,12 +315,14 @@ static int hb_hp_detect(void)
{
struct i2c_adapter *adap = i2c_get_adapter(1);
int ret;
-
struct i2c_client tpa_i2c_client = {
.addr = 0x60,
.adapter = adap,
};
+ if (!adap)
+ return -EPROBE_DEFER; /* I2C module not yet available */
+
ret = i2c_smbus_read_byte(&tpa_i2c_client) >= 0;
i2c_put_adapter(adap);
return ret;
@@ -342,7 +344,10 @@ static int snd_rpi_hifiberry_dacplus_pro
struct of_changeset ocs;
/* probe for head phone amp */
- if (hb_hp_detect()) {
+ ret = hb_hp_detect();
+ if (ret < 0)
+ return ret;
+ if (ret) {
card->aux_dev = hifiberry_dacplus_aux_devs;
card->num_aux_devs =
ARRAY_SIZE(hifiberry_dacplus_aux_devs);
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