From 1b497e6493c49bbb55c89f53562f7f853495e90d Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Thu, 16 Mar 2017 14:34:51 -0500 Subject: [PATCH] PCI: dwc: Fix uninitialized variable in dw_handle_msi_irq() The bug is that "val" is unsigned long but we only initialize 32 bits of it. Then we test "if (val)" and that might be true not because we set the bits but because some were never initialized. Fixes: f342d940ee0e ("PCI: exynos: Add support for MSI") Signed-off-by: Dan Carpenter Signed-off-by: Bjorn Helgaas --- drivers/pci/dwc/pcie-designware-host.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c index 6cdd41f06dea..aece2962defc 100644 --- a/drivers/pci/dwc/pcie-designware-host.c +++ b/drivers/pci/dwc/pcie-designware-host.c @@ -56,19 +56,20 @@ static struct irq_chip dw_msi_irq_chip = { /* MSI int handler */ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp) { - unsigned long val; + u32 val; int i, pos, irq; irqreturn_t ret = IRQ_NONE; for (i = 0; i < MAX_MSI_CTRLS; i++) { dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4, - (u32 *)&val); + &val); if (!val) continue; ret = IRQ_HANDLED; pos = 0; - while ((pos = find_next_bit(&val, 32, pos)) != 32) { + while ((pos = find_next_bit((unsigned long *) &val, 32, + pos)) != 32) { irq = irq_find_mapping(pp->irq_domain, i * 32 + pos); dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4, 1 << pos);