linux-kernel - [PATCH 2/2] mfd: lp8788: Fix an error handling path in lp8788_irq_init() and lp8788_irq

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Date:   Sun, 31 Jul 2022 11:55:38 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Lee Jones <lee@...nel.org>, Samuel Ortiz <sameo@...ux.intel.com>,
        Milo Kim <Milo.Kim@...com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 2/2] mfd: lp8788: Fix an error handling path in lp8788_irq_init() and lp8788_irq_init()

In lp8788_irq_init(), if an error occurs after a successful
irq_domain_add_linear() call, it must be undone by a corresponding
irq_domain_remove() call.

irq_domain_remove() should also be called in lp8788_irq_exit() for the same
reason.

Fixes: eea6b7cc53aa ("mfd: Add lp8788 mfd driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/mfd/lp8788-irq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/lp8788-irq.c b/drivers/mfd/lp8788-irq.c
index 348439a3fbbd..39006297f3d2 100644
--- a/drivers/mfd/lp8788-irq.c
+++ b/drivers/mfd/lp8788-irq.c
@@ -175,6 +175,7 @@ int lp8788_irq_init(struct lp8788 *lp, int irq)
 				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 				"lp8788-irq", irqd);
 	if (ret) {
+		irq_domain_remove(lp->irqdm);
 		dev_err(lp->dev, "failed to create a thread for IRQ_N\n");
 		return ret;
 	}
@@ -188,4 +189,6 @@ void lp8788_irq_exit(struct lp8788 *lp)
 {
 	if (lp->irq)
 		free_irq(lp->irq, lp->irqdm);
+	if (lp->irqdm)
+		irq_domain_remove(lp->irqdm);
 }
-- 
2.34.1