linux-kernel - [PATCH 1/7] PCI: aardvark: Do not touch status bits of masked interrupts in interrupt handler

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Message-Id: <20210625090319.10220-2-pali@kernel.org>
Date:   Fri, 25 Jun 2021 11:03:13 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>
Cc:     Marek Behún <kabel@...nel.org>,
        Marc Zyngier <maz@...nel.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] PCI: aardvark: Do not touch status bits of masked interrupts in interrupt handler

It is incorrect to clear status bits of masked interrupts.

The aardvark driver clears all status interrupt bits when no unmasked
status bit was set. When some unmasked bit was set then masked bits were
not cleared. Fix this so that masked bits are never cleared.

Signed-off-by: Pali Rohár <pali@...nel.org>
Reviewed-by: Marek Behún <kabel@...nel.org>
Cc: stable@...r.kernel.org
---
 drivers/pci/controller/pci-aardvark.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index d4215da17a59..36fcc077ec72 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1210,11 +1210,8 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
 	isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
 	isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
 
-	if (!isr0_status && !isr1_status) {
-		advk_writel(pcie, isr0_val, PCIE_ISR0_REG);
-		advk_writel(pcie, isr1_val, PCIE_ISR1_REG);
+	if (!isr0_status && !isr1_status)
 		return;
-	}
 
 	/* Process MSI interrupts */
 	if (isr0_status & PCIE_ISR0_MSI_INT_PENDING)
-- 
2.20.1