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@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 3321da945f0f..8bf7c2714db6 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;
         }