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