From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	Rosen Penev <rosenp@gmail.com>,
	Damien Le Moal <dlemoal@kernel.org>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 040/456] ata: sata_dwc_460ex: enable SATA interrupts only after IRQ handler is registered
Date: Mon, 17 Aug 2026 15:27:10 +0200
Message-ID: <20260817132541.606094446@linuxfoundation.org>
In-Reply-To: <20260817132539.792407575@linuxfoundation.org>
References: <20260817132539.792407575@linuxfoundation.org>
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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rosen Penev <rosenp@gmail.com>

[ Upstream commit 4bbc16a353a98023e5ddfca7c1fc0e49971cf4d0 ]

sata_dwc_enable_interrupts() is called before platform_get_irq() and
ata_host_activate(), leaving the SATA controller's interrupt mask
enabled without a registered handler.  If a later step fails (irq
request, phy init, etc.) or if the controller asserts an interrupt
during probe, the irq line may fire with no handler, causing a
spurious interrupt storm.

Move sata_dwc_enable_interrupts() after ata_host_activate() so that
interrupts are only unmasked once the handler is registered and the
core is fully initialized.

Fixes: 62936009f35a ("[libata] Add 460EX on-chip SATA driver, sata_dwc_460ex")
Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ata/sata_dwc_460ex.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c
index 29e2b0dfba3096..dc9d91eacac82e 100644
--- a/drivers/ata/sata_dwc_460ex.c
+++ b/drivers/ata/sata_dwc_460ex.c
@@ -1256,9 +1256,6 @@ static int sata_dwc_probe(struct platform_device *ofdev)
 	/* Save dev for later use in dev_xxx() routines */
 	hsdev->dev = &ofdev->dev;
 
-	/* Enable SATA Interrupts */
-	sata_dwc_enable_interrupts(hsdev);
-
 	/* Get SATA interrupt number */
 	irq = irq_of_parse_and_map(np, 0);
 	if (irq == NO_IRQ) {
@@ -1291,6 +1288,8 @@ static int sata_dwc_probe(struct platform_device *ofdev)
 	if (err)
 		dev_err(&ofdev->dev, "failed to activate host");
 
+	/* Enable SATA Interrupts */
+	sata_dwc_enable_interrupts(hsdev);
 	return 0;
 
 error_out:
-- 
2.53.0