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

Message ID 20210625090319.10220-2-pali@kernel.org
State New
Headers show
Series [1/7] PCI: aardvark: Do not touch status bits of masked interrupts in interrupt handler | expand

Commit Message

Pali Rohár June 25, 2021, 9:03 a.m. UTC 
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@kernel.org>
Reviewed-by: Marek Behún <kabel@kernel.org>
Cc: stable@vger.kernel.org
---
 drivers/pci/controller/pci-aardvark.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
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Patch

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)