linux-kernel - [PATCH] regulator: Documentation fix for regulator error notification helper

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Message-ID: <20210823075651.GA3717293@localhost.localdomain>
Date:   Mon, 23 Aug 2021 10:56:51 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     Matti Vaittinen <mazziesaccount@...il.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: Documentation fix for regulator error
 notification helper

The helper to send IRQ notification for regulator errors had still
old description mentioning calling BUG() as a last resort when
error status reading has kept failing for more times than a given
threshold.

The impementation calling BUG() did never end-up in-tree but was
replaced by hopefully more sophisticated handler trying to power-off
the system.

Fix the documentation to reflect actual behaviour.

Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
 drivers/regulator/irq_helpers.c  | 2 +-
 include/linux/regulator/driver.h | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/irq_helpers.c b/drivers/regulator/irq_helpers.c
index fabe2e53093e..522764435575 100644
--- a/drivers/regulator/irq_helpers.c
+++ b/drivers/regulator/irq_helpers.c
@@ -184,7 +184,7 @@ static irqreturn_t regulator_notifier_isr(int irq, void *data)
 	 * If retry_count exceeds the given safety limit we call IC specific die
 	 * handler which can try disabling regulator(s).
 	 *
-	 * If no die handler is given we will just bug() as a last resort.
+	 * If no die handler is given we will just power-off as a last resort.
 	 *
 	 * We could try disabling all associated rdevs - but we might shoot
 	 * ourselves in the head and leave the problematic regulator enabled. So
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 92bf7584a2f0..bd7a73db2e66 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -527,8 +527,8 @@ struct regulator_irq_data {
  *		active events as core does not clean the map data.
  *		REGULATOR_FAILED_RETRY can be returned to indicate that the
  *		status reading from IC failed. If this is repeated for
- *		fatal_cnt times the core will call die() callback or BUG()
- *		as a last resort to protect the HW.
+ *		fatal_cnt times the core will call die() callback or power-off
+ *		the system as a last resort to protect the HW.
  * @renable:	Optional callback to check status (if HW supports that) before
  *		re-enabling IRQ. If implemented this should clear the error
  *		flags so that errors fetched by regulator_get_error_flags()
@@ -537,7 +537,8 @@ struct regulator_irq_data {
  *		REGULATOR_FAILED_RETRY can be returned to
  *		indicate that the status reading from IC failed. If this is
  *		repeated for 'fatal_cnt' times the core will call die()
- *		callback or BUG() as a last resort to protect the HW.
+ *		callback or if die() is not populated then attempt to power-off
+ *		the system as a last resort to protect the HW.
  *		Returning zero indicates that the problem in HW has been solved
  *		and IRQ will be re-enabled. Returning REGULATOR_ERROR_ON
  *		indicates the error condition is still active and keeps IRQ

base-commit: aa9f92097dcc83848ee7e4ea5ddbdd15db5eff64
-- 
2.25.4


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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