forked from mirrors/linux
4cfd218855
Drivers may rely on pci_disable_link_state() having disabled certain ASPM link states. If OS can't control ASPM then pci_disable_link_state() turns into a no-op w/o informing the caller. The driver therefore may falsely assume the respective ASPM link states are disabled. Let pci_disable_link_state() propagate errors to the caller, enabling the caller to react accordingly. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
36 lines
889 B
C
36 lines
889 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* aspm.h
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*
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* PCI Express ASPM defines and function prototypes
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*
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* Copyright (C) 2007 Intel Corp.
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* Zhang Yanmin (yanmin.zhang@intel.com)
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* Shaohua Li (shaohua.li@intel.com)
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*
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* For more information, please consult the following manuals (look at
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* http://www.pcisig.com/ for how to get them):
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*
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* PCI Express Specification
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*/
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#ifndef LINUX_ASPM_H
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#define LINUX_ASPM_H
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#include <linux/pci.h>
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#define PCIE_LINK_STATE_L0S 1
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#define PCIE_LINK_STATE_L1 2
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#define PCIE_LINK_STATE_CLKPM 4
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#ifdef CONFIG_PCIEASPM
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int pci_disable_link_state(struct pci_dev *pdev, int state);
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int pci_disable_link_state_locked(struct pci_dev *pdev, int state);
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void pcie_no_aspm(void);
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#else
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static inline int pci_disable_link_state(struct pci_dev *pdev, int state)
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{ return 0; }
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static inline void pcie_no_aspm(void) { }
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#endif
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#endif /* LINUX_ASPM_H */
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