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regulator: da9211: Use irq handler when ready

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[ Upstream commit 02228f6aa6 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ricardo Ribalda 2022-11-27 22:06:02 +01:00 committed by Greg Kroah-Hartman
parent dd187d7e80
commit 1c1afcb883
1 changed files with 6 additions and 5 deletions
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11
drivers/regulator/da9211-regulator.c
View file

@ -470,6 +470,12 @@ 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,
@ -484,11 +490,6 @@ 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;
}