regulator: da9211: Use irq handler when ready

[ Upstream commit 02228f6aa6a64d588bc31e3267d05ff184d772eb ]

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>

diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c
index bf80748f1ccc2a80ab014ae84bde52696e117a41..7baa6121cc66fec3a6b9fbaa3243039faf0d3b66 100644 (file)
--- a/drivers/regulator/da9211-regulator.c
+++ b/drivers/regulator/da9211-regulator.c
@@ -471,6 +471,12 @@ 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,
@@ -485,11 +491,6 @@ 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;
 }