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Message-Id: <20230828-tps6594_random_boot_crash_fix-v1-1-f29cbf9ddb37@baylibre.com>
Date: Tue, 05 Sep 2023 16:07:34 +0200
From: Jerome Neanne <jneanne@...libre.com>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Esteban Blanc <eblanc@...libre.com>
Cc: linux-kernel@...r.kernel.org, u-kumar1@...com, jpanis@...libre.com,
khilman@...libre.com, s.sharma@...com, aseketeli@...libre.com,
Jerome Neanne <jneanne@...libre.com>
Subject: [PATCH] regulator: tps6594-regulator: Fix random kernel crash
Random kernel crash detected in TI CICD when regulator driver is added.
This is root caused to irq index increment being done twice causing
irq_data being allocated outside of the range.
- Rework tps6594_request_reg_irqs with correct index increment
- Adjust irq_data kmalloc size to the exact size needed for the device
This has been reported on TI mainline. No public bug report associated.
Reported-by: Udit Kumar <u-kumar1@...com>
Fixes: f17ccc5deb4d ("regulator: tps6594-regulator: Add driver for TI TPS6594 regulators")
Signed-off-by: Jerome Neanne <jneanne@...libre.com>
---
Random kernel crash detected in TI CICD when regulator driver is added.
This is root caused to irq index increment being done twice causing
irq_data being allocated outside of the range.
---
drivers/regulator/tps6594-regulator.c | 31 +++++++++++++++----------------
1 file changed, 15 insertions(+), 16 deletions(-)
diff --git a/drivers/regulator/tps6594-regulator.c b/drivers/regulator/tps6594-regulator.c
index d5a574ec6d12..47c3b7efe145 100644
--- a/drivers/regulator/tps6594-regulator.c
+++ b/drivers/regulator/tps6594-regulator.c
@@ -384,21 +384,19 @@ static int tps6594_request_reg_irqs(struct platform_device *pdev,
if (irq < 0)
return -EINVAL;
- irq_data[*irq_idx + j].dev = tps->dev;
- irq_data[*irq_idx + j].type = irq_type;
- irq_data[*irq_idx + j].rdev = rdev;
+ irq_data[*irq_idx].dev = tps->dev;
+ irq_data[*irq_idx].type = irq_type;
+ irq_data[*irq_idx].rdev = rdev;
error = devm_request_threaded_irq(tps->dev, irq, NULL,
- tps6594_regulator_irq_handler,
- IRQF_ONESHOT,
- irq_type->irq_name,
- &irq_data[*irq_idx]);
- (*irq_idx)++;
+ tps6594_regulator_irq_handler, IRQF_ONESHOT,
+ irq_type->irq_name, &irq_data[*irq_idx]);
if (error) {
dev_err(tps->dev, "tps6594 failed to request %s IRQ %d: %d\n",
irq_type->irq_name, irq, error);
return error;
}
+ (*irq_idx)++;
}
return 0;
}
@@ -420,8 +418,8 @@ static int tps6594_regulator_probe(struct platform_device *pdev)
int error, i, irq, multi, delta;
int irq_idx = 0;
int buck_idx = 0;
- int ext_reg_irq_nb = 2;
-
+ size_t ext_reg_irq_nb = 2;
+ size_t reg_irq_nb;
enum {
MULTI_BUCK12,
MULTI_BUCK123,
@@ -484,15 +482,16 @@ static int tps6594_regulator_probe(struct platform_device *pdev)
}
}
- if (tps->chip_id == LP8764)
+ if (tps->chip_id == LP8764) {
/* There is only 4 buck on LP8764 */
buck_configured[4] = 1;
+ reg_irq_nb = size_mul(REGS_INT_NB, (BUCK_NB - 1));
+ } else {
+ reg_irq_nb = size_mul(REGS_INT_NB, (size_add(BUCK_NB, LDO_NB)));
+ }
- irq_data = devm_kmalloc_array(tps->dev,
- REGS_INT_NB * sizeof(struct tps6594_regulator_irq_data),
- ARRAY_SIZE(tps6594_bucks_irq_types) +
- ARRAY_SIZE(tps6594_ldos_irq_types),
- GFP_KERNEL);
+ irq_data = devm_kmalloc_array(tps->dev, reg_irq_nb,
+ sizeof(struct tps6594_regulator_irq_data), GFP_KERNEL);
if (!irq_data)
return -ENOMEM;
---
base-commit: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c
change-id: 20230828-tps6594_random_boot_crash_fix-f74a0fde7370
Best regards,
--
Jerome Neanne <jneanne@...libre.com>
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