/* Generic I/O and MEMIO string operations. */ #define __ide_insw insw #define __ide_insl insl #define __ide_outsw outsw #define __ide_outsl outsl static __inline__ void __ide_mm_insw(void __iomem *port, void *addr, u32 count) { while (count--) { *(u16 *)addr = readw(port); addr += 2; } } static __inline__ void __ide_mm_insl(void __iomem *port, void *addr, u32 count) { while (count--) { *(u32 *)addr = readl(port); addr += 4; } } static __inline__ void __ide_mm_outsw(void __iomem *port, void *addr, u32 count) { while (count--) { writew(*(u16 *)addr, port); addr += 2; } } static __inline__ void __ide_mm_outsl(void __iomem * port, void *addr, u32 count) { while (count--) { writel(*(u32 *)addr, port); addr += 4; } } ='/cgit.png' alt='cgit logo'/> index : net-next.git
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /include/acpi/acpi_bus.h
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'include/acpi/acpi_bus.h')