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MIPS: loongson64: cs5536: Fix PCI_OHCI_INT_REG reads

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[ Upstream commit cd87668d60 ]

The PCI_OHCI_INT_REG case in pci_ohci_read_reg() contains the following
if statement:

  if ((lo & 0x00000f00) == CS5536_USB_INTR)

CS5536_USB_INTR expands to the constant 11, which gives us the following
condition which can never evaluate true:

  if ((lo & 0xf00) == 11)

At least when using GCC 8.1.0 this falls foul of the tautoligcal-compare
warning, and since the code is built with the -Werror flag the build
fails.

Fix this by shifting lo right by 8 bits in order to match the
corresponding PCI_OHCI_INT_REG case in pci_ohci_write_reg().

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19861/
Cc: Huacai Chen <chenhc@lemote.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Burton
2018-07-16 08:26:36 -07:00
committed by Greg Kroah-Hartman
parent 55bdb77aa9
commit c2bd54bc22
1 changed files with 1 additions and 1 deletions
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2
arch/mips/loongson64/common/cs5536/cs5536_ohci.c
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@@ -138,7 +138,7 @@ u32 pci_ohci_read_reg(int reg)
break;
case PCI_OHCI_INT_REG:
_rdmsr(DIVIL_MSR_REG(PIC_YSEL_LOW), &hi, &lo);
if ((lo & 0x00000f00) == CS5536_USB_INTR)
if (((lo >> PIC_YSEL_LOW_USB_SHIFT) & 0xf) == CS5536_USB_INTR)
conf_data = 1;
break;
default: