linux-kernel - [PATCH] mfd: Don't use irq_create

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Message-Id: <20210725180754.250163-1-maz@kernel.org>
Date:   Sun, 25 Jul 2021 19:07:54 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     kernel-team@...roid.com, Linus Walleij <linus.walleij@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
Subject: [PATCH] mfd: Don't use irq_create_mapping() to resolve a mapping

Although irq_create_mapping() is able to deal with duplicate
mappings, it really isn't supposed to be a substitute for
irq_find_mapping(), and can result in allocations that take place
in atomic context if the mapping didn't exist.

Fix the handful of MFD drivers that use irq_create_mapping() in
interrupt context by using irq_find_mapping() instead.

Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/mfd/ab8500-core.c | 2 +-
 drivers/mfd/stmpe.c       | 4 ++--
 drivers/mfd/tc3589x.c     | 2 +-
 drivers/mfd/wm8994-irq.c  | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 30489670ea52..cca0aac26148 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -485,7 +485,7 @@ static int ab8500_handle_hierarchical_line(struct ab8500 *ab8500,
 		if (line == AB8540_INT_GPIO43F || line == AB8540_INT_GPIO44F)
 			line += 1;
 
-		handle_nested_irq(irq_create_mapping(ab8500->domain, line));
+		handle_nested_irq(irq_find_mapping(ab8500->domain, line));
 	}
 
 	return 0;
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 1dd39483e7c1..58d09c615e67 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -1095,7 +1095,7 @@ static irqreturn_t stmpe_irq(int irq, void *data)
 
 	if (variant->id_val == STMPE801_ID ||
 	    variant->id_val == STMPE1600_ID) {
-		int base = irq_create_mapping(stmpe->domain, 0);
+		int base = irq_find_mapping(stmpe->domain, 0);
 
 		handle_nested_irq(base);
 		return IRQ_HANDLED;
@@ -1123,7 +1123,7 @@ static irqreturn_t stmpe_irq(int irq, void *data)
 		while (status) {
 			int bit = __ffs(status);
 			int line = bank * 8 + bit;
-			int nestedirq = irq_create_mapping(stmpe->domain, line);
+			int nestedirq = irq_find_mapping(stmpe->domain, line);
 
 			handle_nested_irq(nestedirq);
 			status &= ~(1 << bit);
diff --git a/drivers/mfd/tc3589x.c b/drivers/mfd/tc3589x.c
index 7614f8fe0e91..13583cdb93b6 100644
--- a/drivers/mfd/tc3589x.c
+++ b/drivers/mfd/tc3589x.c
@@ -187,7 +187,7 @@ static irqreturn_t tc3589x_irq(int irq, void *data)
 
 	while (status) {
 		int bit = __ffs(status);
-		int virq = irq_create_mapping(tc3589x->domain, bit);
+		int virq = irq_find_mapping(tc3589x->domain, bit);
 
 		handle_nested_irq(virq);
 		status &= ~(1 << bit);
diff --git a/drivers/mfd/wm8994-irq.c b/drivers/mfd/wm8994-irq.c
index 6c3a619e2628..651a028bc519 100644
--- a/drivers/mfd/wm8994-irq.c
+++ b/drivers/mfd/wm8994-irq.c
@@ -154,7 +154,7 @@ static irqreturn_t wm8994_edge_irq(int irq, void *data)
 	struct wm8994 *wm8994 = data;
 
 	while (gpio_get_value_cansleep(wm8994->pdata.irq_gpio))
-		handle_nested_irq(irq_create_mapping(wm8994->edge_irq, 0));
+		handle_nested_irq(irq_find_mapping(wm8994->edge_irq, 0));
 
 	return IRQ_HANDLED;
 }
-- 
2.30.2