PCI: aardvark: Do not clear status bits of masked interrupts

The PCIE_ISR1_REG says which interrupts are currently set / active,
including those which are masked.

The driver currently reads this register and looks if some unmasked
interrupts are active, and if not, it clears status bits of _all_
interrupts, including the masked ones.

This is incorrect, since, for example, some drivers may poll these bits.

Remove this clearing, and also remove this early return statement
completely, since it does not change functionality in any way.

Link: https://lore.kernel.org/r/20211005180952.6812-7-kabel@kernel.org
Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Marek Behún <kabel@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index d5d6f92e5143a0cb8db92b6f9d9fa7a925cc5b9f..f7eebf453e836024aefd3bbcec0607b446078cc6 100644 (file)
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1295,12 +1295,6 @@ 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);
-               return;
-       }
-
        /* Process MSI interrupts */
        if (isr0_status & PCIE_ISR0_MSI_INT_PENDING)
                advk_pcie_handle_msi(pcie);