linux-kernel - [PATCH 1/4] ipmi: kcs_bmc: Simplify irq handling

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Date:   Tue, 16 Feb 2021 23:33:14 -0800
From:   "William A. Kennington III" <wak@...gle.com>
To:     Corey Minyard <minyard@....org>
Cc:     openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org,
        "William A. Kennington III" <wak@...gle.com>
Subject: [PATCH 1/4] ipmi: kcs_bmc: Simplify irq handling

Platforms specific IRQ handles repeat the same logic, calling a
sub-handler in the kcs_bmc generic code that should just conform to the
irqhandler callback.

Signed-off-by: William A. Kennington III <wak@...gle.com>
---
 drivers/char/ipmi/kcs_bmc.c         | 10 +++++-----
 drivers/char/ipmi/kcs_bmc.h         |  3 ++-
 drivers/char/ipmi/kcs_bmc_aspeed.c  | 12 +-----------
 drivers/char/ipmi/kcs_bmc_npcm7xx.c | 12 +-----------
 4 files changed, 9 insertions(+), 28 deletions(-)

diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c
index f292e74bd4a5..ccb35f1645cf 100644
--- a/drivers/char/ipmi/kcs_bmc.c
+++ b/drivers/char/ipmi/kcs_bmc.c
@@ -209,10 +209,11 @@ static void kcs_bmc_handle_cmd(struct kcs_bmc *kcs_bmc)
 	}
 }
 
-int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc)
+irqreturn_t kcs_bmc_irq(int irq, void *arg)
 {
+	struct kcs_bmc *kcs_bmc = arg;
 	unsigned long flags;
-	int ret = -ENODATA;
+	irqreturn_t ret = IRQ_NONE;
 	u8 status;
 
 	spin_lock_irqsave(&kcs_bmc->lock, flags);
@@ -225,15 +226,14 @@ int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc)
 			kcs_bmc_handle_cmd(kcs_bmc);
 		else
 			kcs_bmc_handle_data(kcs_bmc);
-
-		ret = 0;
+		ret = IRQ_HANDLED;
 	}
 
 	spin_unlock_irqrestore(&kcs_bmc->lock, flags);
 
 	return ret;
 }
-EXPORT_SYMBOL(kcs_bmc_handle_event);
+EXPORT_SYMBOL(kcs_bmc_irq);
 
 static inline struct kcs_bmc *to_kcs_bmc(struct file *filp)
 {
diff --git a/drivers/char/ipmi/kcs_bmc.h b/drivers/char/ipmi/kcs_bmc.h
index eb9ea4ce78b8..959d7042e6d2 100644
--- a/drivers/char/ipmi/kcs_bmc.h
+++ b/drivers/char/ipmi/kcs_bmc.h
@@ -6,6 +6,7 @@
 #ifndef __KCS_BMC_H__
 #define __KCS_BMC_H__
 
+#include <linux/irqreturn.h>
 #include <linux/miscdevice.h>
 
 /* Different phases of the KCS BMC module.
@@ -102,7 +103,7 @@ static inline void *kcs_bmc_priv(struct kcs_bmc *kcs_bmc)
 	return kcs_bmc->priv;
 }
 
-int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc);
+irqreturn_t kcs_bmc_irq(int irq, void *arg);
 struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv,
 					u32 channel);
 #endif /* __KCS_BMC_H__ */
diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
index a140203c079b..6451a8af2664 100644
--- a/drivers/char/ipmi/kcs_bmc_aspeed.c
+++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
@@ -203,16 +203,6 @@ static void aspeed_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable)
 	}
 }
 
-static irqreturn_t aspeed_kcs_irq(int irq, void *arg)
-{
-	struct kcs_bmc *kcs_bmc = arg;
-
-	if (!kcs_bmc_handle_event(kcs_bmc))
-		return IRQ_HANDLED;
-
-	return IRQ_NONE;
-}
-
 static int aspeed_kcs_config_irq(struct kcs_bmc *kcs_bmc,
 			struct platform_device *pdev)
 {
@@ -223,7 +213,7 @@ static int aspeed_kcs_config_irq(struct kcs_bmc *kcs_bmc,
 	if (irq < 0)
 		return irq;
 
-	return devm_request_irq(dev, irq, aspeed_kcs_irq, IRQF_SHARED,
+	return devm_request_irq(dev, irq, kcs_bmc_irq, IRQF_SHARED,
 				dev_name(dev), kcs_bmc);
 }
 
diff --git a/drivers/char/ipmi/kcs_bmc_npcm7xx.c b/drivers/char/ipmi/kcs_bmc_npcm7xx.c
index 722f7391fe1f..f417813cf900 100644
--- a/drivers/char/ipmi/kcs_bmc_npcm7xx.c
+++ b/drivers/char/ipmi/kcs_bmc_npcm7xx.c
@@ -108,16 +108,6 @@ static void npcm7xx_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable)
 			   enable ? KCS_IE_IRQE | KCS_IE_HIRQE : 0);
 }
 
-static irqreturn_t npcm7xx_kcs_irq(int irq, void *arg)
-{
-	struct kcs_bmc *kcs_bmc = arg;
-
-	if (!kcs_bmc_handle_event(kcs_bmc))
-		return IRQ_HANDLED;
-
-	return IRQ_NONE;
-}
-
 static int npcm7xx_kcs_config_irq(struct kcs_bmc *kcs_bmc,
 				  struct platform_device *pdev)
 {
@@ -128,7 +118,7 @@ static int npcm7xx_kcs_config_irq(struct kcs_bmc *kcs_bmc,
 	if (irq < 0)
 		return irq;
 
-	return devm_request_irq(dev, irq, npcm7xx_kcs_irq, IRQF_SHARED,
+	return devm_request_irq(dev, irq, kcs_bmc_irq, IRQF_SHARED,
 				dev_name(dev), kcs_bmc);
 }
 
-- 
2.30.0.478.g8a0d178c01-goog