PCI: tegra194: Fix tegra_pcie_ep_raise_msi_irq() ill-defined shift

tegra_pcie_ep_raise_msi_irq() shifted a signed 32-bit value left by 31
bits.  The behavior of this is implementation-defined.

Replace the shift by BIT(), which is well-defined.

Found by cppcheck:

  $ cppcheck --enable=all drivers/pci/controller/dwc/pcie-tegra194.c
  Checking drivers/pci/controller/dwc/pcie-tegra194.c ...

  drivers/pci/controller/dwc/pcie-tegra194.c:1829:23: portability: Shifting signed 32-bit value by 31 bits is implementation-defined behaviour. See condition at line 1826.  [shiftTooManyBitsSigned]

  appl_writel(pcie, (1 << irq), APPL_MSI_CTRL_1);
                     ^

[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20210618160219.303092-1-jonathanh@nvidia.com
Fixes: c57247f940e8 ("PCI: tegra: Add support for PCIe endpoint mode in Tegra194")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index b19775ab134eef68bc648e31e6bbc47c7b540f79..5a64c6139e6c1c15278a376b22511f958522bd7f 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1926,7 +1926,7 @@ static int tegra_pcie_ep_raise_msi_irq(struct tegra_pcie_dw *pcie, u16 irq)
        if (unlikely(irq > 31))
                return -EINVAL;
 
-       appl_writel(pcie, (1 << irq), APPL_MSI_CTRL_1);
+       appl_writel(pcie, BIT(irq), APPL_MSI_CTRL_1);
 
        return 0;
 }