linux-kernel - [PATCH v2 2/2] PCI: dra7xx: Iterate over INTx status bits

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Date:   Fri, 29 Dec 2017 17:11:31 +0530
From:   Vignesh R <vigneshr@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Vignesh R <vigneshr@...com>
Subject: [PATCH v2 2/2] PCI: dra7xx: Iterate over INTx status bits

It is possible that more than one legacy IRQ may be set at the same
time, therefore iterate and handle all the pending INTx interrupts
before clearing the status and exiting the IRQ handler. Otherwise, some
interrupts would be lost.

Signed-off-by: Vignesh R <vigneshr@...com>
---
 drivers/pci/dwc/pci-dra7xx.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 892f93910012..48c6ae535847 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -257,7 +257,8 @@ static irqreturn_t dra7xx_pcie_msi_irq_handler(int irq, void *arg)
 	struct dra7xx_pcie *dra7xx = arg;
 	struct dw_pcie *pci = dra7xx->pci;
 	struct pcie_port *pp = &pci->pp;
-	u32 reg;
+	unsigned long reg;
+	u32 virq, bit;
 
 	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);
 
@@ -269,8 +270,11 @@ static irqreturn_t dra7xx_pcie_msi_irq_handler(int irq, void *arg)
 	case INTB:
 	case INTC:
 	case INTD:
-		generic_handle_irq(irq_find_mapping(dra7xx->irq_domain,
-						    ffs(reg) - 1));
+		for_each_set_bit(bit, &reg, PCI_NUM_INTX) {
+			virq = irq_find_mapping(dra7xx->irq_domain, bit);
+			if (virq)
+				generic_handle_irq(virq);
+		}
 		break;
 	}
 
-- 
2.15.1