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Commit 967fbb8e authored by Yue Ma's avatar Yue Ma Committed by Matt Wagantall
Browse files

cnss: Add support to trigger kernel panic when PCIe link down happens 



Currently when PCIe link down is detected, CNSS/WLAN tries to schedule
a recovery. For debugging purpose, add the option to trigger kernel panic
when PCIe link down happens in order to catch the issues.

Change-Id: I532deb2edf6bdb7b388e4615084cbe8dd8a350ad
Signed-off-by: default avatarYue Ma <yuem@codeaurora.org>
parent 18dab37e

drivers/net/wireless/cnss/cnss.c

+11 −0
Original line number Diff line number Diff line
@@ -277,6 +277,11 @@ static struct cnss_data { 
	unsigned long last_activity;

} *penv;



static unsigned int pcie_link_down_panic;

module_param(pcie_link_down_panic, uint, S_IRUSR | S_IWUSR);

MODULE_PARM_DESC(pcie_link_down_panic,

		"Trigger kernel panic when PCIe link down is detected");



static int cnss_wlan_vreg_on(struct cnss_wlan_vreg_info *vreg_info)

{

	int ret;
@@ -1506,6 +1511,9 @@ void cnss_pci_events_cb(struct msm_pcie_notify *notify) 
	switch (notify->event) {



	case MSM_PCIE_EVENT_LINKDOWN:

		if (pcie_link_down_panic)

			panic("PCIe link is down!\n");



		spin_lock_irqsave(&pci_link_down_lock, flags);

		if (penv->pcie_link_down_ind) {

			pr_debug("PCI link down recovery is in progress, ignore!\n");
@@ -1537,6 +1545,9 @@ void cnss_wlan_pci_link_down(void) 
{

	unsigned long flags;



	if (pcie_link_down_panic)

		panic("PCIe link is down!\n");



	spin_lock_irqsave(&pci_link_down_lock, flags);

	if (penv->pcie_link_down_ind) {

		pr_debug("PCI link down recovery is in progress, ignore!\n");