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From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     greybus-dev@lists.linaro.org, linux-i2c@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev,
        linux-usb@vger.kernel.org, netdev@vger.kernel.org
Cc:     "David S. Miller" <davem@davemloft.net>,
        Alex Elder <elder@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hans de Goede <hdegoede@redhat.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hovold <johan@kernel.org>,
        Lee Jones <lee.jones@linaro.org>,
        Rui Miguel Silva <rmfrfs@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        UNGLinuxDriver@microchip.com, Wolfram Sang <wsa@kernel.org>,
        Woojung Huh <woojung.huh@microchip.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 1/7] genirq: Provide generic_handle_irq_safe().
Date:   Thu, 27 Jan 2022 12:32:57 +0100
Message-Id: <20220127113303.3012207-2-bigeasy@linutronix.de>
In-Reply-To: <20220127113303.3012207-1-bigeasy@linutronix.de>
References: <20220127113303.3012207-1-bigeasy@linutronix.de>
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Provide generic_handle_irq_safe() which can be used can used from any
context.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 include/linux/irqdesc.h |  1 +
 kernel/irq/irqdesc.c    | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 93d270ca0c567..a77584593f7d1 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -160,6 +160,7 @@ static inline void generic_handle_irq_desc(struct irq_d=
esc *desc)
=20
 int handle_irq_desc(struct irq_desc *desc);
 int generic_handle_irq(unsigned int irq);
+int generic_handle_irq_safe(unsigned int irq);
=20
 #ifdef CONFIG_IRQ_DOMAIN
 /*
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 2267e6527db3c..97223df2f460e 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -662,6 +662,27 @@ int generic_handle_irq(unsigned int irq)
 }
 EXPORT_SYMBOL_GPL(generic_handle_irq);
=20
+/**
+ * generic_handle_irq_safe - Invoke the handler for a particular irq
+ * @irq:	The irq number to handle
+ *
+ * Returns:	0 on success, or -EINVAL if conversion has failed
+ *
+ * This function must be called either from an IRQ context with irq regs
+ * initialized or with care from any context.
+ */
+int generic_handle_irq_safe(unsigned int irq)
+{
+	unsigned long flags;
+	int ret;
+
+	local_irq_save(flags);
+	ret =3D handle_irq_desc(irq_to_desc(irq));
+	local_irq_restore(flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
+
 #ifdef CONFIG_IRQ_DOMAIN
 /**
  * generic_handle_domain_irq - Invoke the handler for a HW irq belonging
--=20
2.34.1