From 02228f6aa6a64d588bc31e3267d05ff184d772eb Mon Sep 17 00:00:00 2001
From: Ricardo Ribalda <ribalda@chromium.org>
Date: Sun, 27 Nov 2022 22:06:02 +0100
Subject: [PATCH] regulator: da9211: Use irq handler when ready
Git-commit: 02228f6aa6a64d588bc31e3267d05ff184d772eb
Patch-mainline: v6.2-rc4
References: git-fixes
If the system does not come from reset (like when it is kexec()), the
regulator might have an IRQ waiting for us.
If we enable the IRQ handler before its structures are ready, we crash.
This patch fixes:
[ 1.141839] Unable to handle kernel read from unreadable memory at virtual address 0000000000000078
[ 1.316096] Call trace:
[ 1.316101] blocking_notifier_call_chain+0x20/0xa8
[ 1.322757] cpu cpu0: dummy supplies not allowed for exclusive requests
[ 1.327823] regulator_notifier_call_chain+0x1c/0x2c
[ 1.327825] da9211_irq_handler+0x68/0xf8
[ 1.327829] irq_thread+0x11c/0x234
[ 1.327833] kthread+0x13c/0x154
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Adam Ward <DLG-Adam.Ward.opensource@dm.renesas.com>
Link: https://lore.kernel.org/r/20221124-da9211-v2-0-1779e3c5d491@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/regulator/da9211-regulator.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c
index e01b32d1fa17..00828f5baa97 100644
--- a/drivers/regulator/da9211-regulator.c
+++ b/drivers/regulator/da9211-regulator.c
@@ -498,6 +498,12 @@ static int da9211_i2c_probe(struct i2c_client *i2c)
chip->chip_irq = i2c->irq;
+ ret = da9211_regulator_init(chip);
+ if (ret < 0) {
+ dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
+ return ret;
+ }
+
if (chip->chip_irq != 0) {
ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
da9211_irq_handler,
@@ -512,11 +518,6 @@ static int da9211_i2c_probe(struct i2c_client *i2c)
dev_warn(chip->dev, "No IRQ configured\n");
}
- ret = da9211_regulator_init(chip);
-
- if (ret < 0)
- dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
-
return ret;
}
--
2.35.3