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Message-Id: <20250729081434.497716-2-panchuang@vivo.com>
Date: Tue, 29 Jul 2025 16:14:34 +0800
From: Pan Chuang <panchuang@...o.com>
To: tglx@...utronix.de,
linux-kernel@...r.kernel.org
Cc: miquel.raynal@...tlin.com,
Jonathan.Cameron@...wei.com,
u.kleine-koenig@...gutronix.de,
angeg.delregno@...labora.com,
krzk@...nel.org,
a.fatoum@...gutronix.de,
frank.li@...o.com,
Pan Chuang <panchuang@...o.com>
Subject: [PATCH v8 1/1] genirq/devres: Add dev_err_probe() in devm_request_threaded_irq() and devm_request_any_context_irq()
The devm_request_threaded_irq() and devm_request_any_context_irq() functions
currently don't print any error when interrupt registration fails. This forces
each driver to implement redundant error logging - over 2,000 lines of error
messages exist across drivers. Additionally, when upper-layer functions
propagate these errors without logging, critical debugging information is lost.
Add automatic error logging to these functions via dev_err_probe(), printing
device name, IRQ number, handler addresses, and error code on failure.
Signed-off-by: Yangtao Li <frank.li@...o.com>
Signed-off-by: Pan Chuang <panchuang@...o.com>
---
kernel/irq/devres.c | 121 +++++++++++++++++++++++++++++---------------
1 file changed, 81 insertions(+), 40 deletions(-)
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index eb16a58e0322..4656ed12532c 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -30,29 +30,11 @@ static int devm_irq_match(struct device *dev, void *res, void *data)
return this->irq == match->irq && this->dev_id == match->dev_id;
}
-/**
- * devm_request_threaded_irq - allocate an interrupt line for a managed device
- * @dev: device to request interrupt for
- * @irq: Interrupt line to allocate
- * @handler: Function to be called when the IRQ occurs
- * @thread_fn: function to be called in a threaded interrupt context. NULL
- * for devices which handle everything in @handler
- * @irqflags: Interrupt type flags
- * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
- * @dev_id: A cookie passed back to the handler function
- *
- * Except for the extra @dev argument, this function takes the
- * same arguments and performs the same function as
- * request_threaded_irq(). IRQs requested with this function will be
- * automatically freed on driver detach.
- *
- * If an IRQ allocated with this function needs to be freed
- * separately, devm_free_irq() must be used.
- */
-int devm_request_threaded_irq(struct device *dev, unsigned int irq,
- irq_handler_t handler, irq_handler_t thread_fn,
- unsigned long irqflags, const char *devname,
- void *dev_id)
+static int __devm_request_threaded_irq(struct device *dev, unsigned int irq,
+ irq_handler_t handler,
+ irq_handler_t thread_fn,
+ unsigned long irqflags,
+ const char *devname, void *dev_id)
{
struct irq_devres *dr;
int rc;
@@ -78,28 +60,50 @@ int devm_request_threaded_irq(struct device *dev, unsigned int irq,
return 0;
}
-EXPORT_SYMBOL(devm_request_threaded_irq);
/**
- * devm_request_any_context_irq - allocate an interrupt line for a managed device
- * @dev: device to request interrupt for
- * @irq: Interrupt line to allocate
- * @handler: Function to be called when the IRQ occurs
- * @irqflags: Interrupt type flags
- * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
- * @dev_id: A cookie passed back to the handler function
+ * devm_request_threaded_irq - allocate an interrupt line for a managed device with error logging
+ * @dev: Device to request interrupt for
+ * @irq: Interrupt line to allocate
+ * @handler: Function to be called when the IRQ occurs
+ * @thread_fn: Function to be called in a threaded interrupt context. NULL
+ * for devices which handle everything in @handler
+ * @irqflags: Interrupt type flags
+ * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
+ * @dev_id: A cookie passed back to the handler function
*
- * Except for the extra @dev argument, this function takes the
- * same arguments and performs the same function as
- * request_any_context_irq(). IRQs requested with this function will be
- * automatically freed on driver detach.
+ * Except for the extra @dev argument, this function takes the same arguments
+ * and performs the same function as request_threaded_irq(). IRQs requested
+ * with this function will be automatically freed on driver detach.
+ *
+ * If an IRQ allocated with this function needs to be freed separately,
+ * devm_free_irq() must be used.
+ *
+ * When the request fails, an error message is printed with contextual
+ * information (device name, interrupt number, handler functions and
+ * error code). Don't add extra error messages at the call sites.
*
- * If an IRQ allocated with this function needs to be freed
- * separately, devm_free_irq() must be used.
+ * Return: 0 on success or a negative error number.
*/
-int devm_request_any_context_irq(struct device *dev, unsigned int irq,
- irq_handler_t handler, unsigned long irqflags,
- const char *devname, void *dev_id)
+int devm_request_threaded_irq(struct device *dev, unsigned int irq,
+ irq_handler_t handler, irq_handler_t thread_fn,
+ unsigned long irqflags, const char *devname,
+ void *dev_id)
+{
+ int rc = __devm_request_threaded_irq(dev, irq, handler, thread_fn,
+ irqflags, devname, dev_id);
+ if (!rc)
+ return 0;
+
+ return dev_err_probe(dev, rc, "request_irq(%u) %pS %pS %s\n",
+ irq, handler, thread_fn, devname ? : "");
+}
+EXPORT_SYMBOL(devm_request_threaded_irq);
+
+static int __devm_request_any_context_irq(struct device *dev, unsigned int irq,
+ irq_handler_t handler,
+ unsigned long irqflags,
+ const char *devname, void *dev_id)
{
struct irq_devres *dr;
int rc;
@@ -124,6 +128,43 @@ int devm_request_any_context_irq(struct device *dev, unsigned int irq,
return rc;
}
+
+/**
+ * devm_request_any_context_irq - allocate an interrupt line for a managed device with error logging
+ * @dev: Device to request interrupt for
+ * @irq: Interrupt line to allocate
+ * @handler: Function to be called when the IRQ occurs
+ * @irqflags: Interrupt type flags
+ * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
+ * @dev_id: A cookie passed back to the handler function
+ *
+ * Except for the extra @dev argument, this function takes the same arguments
+ * and performs the same function as request_any_context_irq(). IRQs requested
+ * with this function will be automatically freed on driver detach.
+ *
+ * If an IRQ allocated with this function needs to be freed separately,
+ * devm_free_irq() must be used.
+ *
+ * When the request fails, an error message is printed with contextual
+ * information (device name, interrupt number, handler functions and
+ * error code). Don't add extra error messages at the call sites.
+ *
+ * On failure, it returns a negative value. On success, it returns either
+ * IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
+ */
+int devm_request_any_context_irq(struct device *dev, unsigned int irq,
+ irq_handler_t handler, unsigned long irqflags,
+ const char *devname, void *dev_id)
+{
+ int rc = __devm_request_any_context_irq(dev, irq, handler, irqflags,
+ devname, dev_id);
+ if (rc < 0) {
+ return dev_err_probe(dev, rc, "request_irq(%u) %pS %s\n",
+ irq, handler, devname ? : "");
+ }
+
+ return rc;
+}
EXPORT_SYMBOL(devm_request_any_context_irq);
/**
--
2.34.1
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