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Commit 6966c9c9 authored by Tony Truong's avatar Tony Truong Committed by Gerrit - the friendly Code Review server
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msm: pcie: validate speed switch request 



Validate the target link speed request to ensure it does not
exceed what PCIe root complex allow.

Change-Id: I62f218e227ff446feae292ce4eeb78b02904ea3e
Signed-off-by: default avatarTony Truong <truong@codeaurora.org>
parent c6b9f7b6

drivers/pci/controller/pci-msm.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -6206,6 +6206,15 @@ int msm_pcie_set_link_bandwidth(struct pci_dev *pci_dev, u16 target_link_speed, 




	pcie_dev = PCIE_BUS_PRIV_DATA(root_pci_dev->bus);

	pcie_dev = PCIE_BUS_PRIV_DATA(root_pci_dev->bus);





	if (target_link_speed > pcie_dev->bw_gen_max ||

		(pcie_dev->target_link_speed &&

		target_link_speed > pcie_dev->target_link_speed)) {

		PCIE_DBG(pcie_dev,

			"PCIe: RC%d: invalid target link speed: %d\n",

			pcie_dev->rc_idx, target_link_speed);

		return -EINVAL;

	}



	pcie_capability_read_word(root_pci_dev, PCI_EXP_LNKSTA, &link_status);

	pcie_capability_read_word(root_pci_dev, PCI_EXP_LNKSTA, &link_status);





	current_link_speed = link_status & PCI_EXP_LNKSTA_CLS;

	current_link_speed = link_status & PCI_EXP_LNKSTA_CLS;