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| author | Jon Hunter <jonathanh@nvidia.com> | 2021-06-18 19:02:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 17:05:52 +0300 |
| commit | e22051e7c9f7091256c18829433c6eedaca799a0 (patch) | |
| tree | 89e2519ca65308b9d927ae978a66856a7211d641 | |
| parent | 527bb29eb183cf1339164d2cc5c7b8aca625bb82 (diff) | |
| download | linux-e22051e7c9f7091256c18829433c6eedaca799a0.tar.xz | |
PCI: tegra194: Fix tegra_pcie_ep_raise_msi_irq() ill-defined shift
[ Upstream commit f67092eff2bd40650aad54a1a1910160f41d864a ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-tegra194.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index d788f4d7f9aa..506f6a294eac 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1841,7 +1841,7 @@ 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; } |