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Commit c0dc1e70 authored by Yue Ma's avatar Yue Ma
Browse files

cnss2: Protect reading host and device timestamp 



In order to read host and device timestamp at almost the same time,
use spinlock to protect them as atomic context.

Change-Id: I1a5355f2dd57cadca2283c4855cf095a6a4da1da
Signed-off-by: default avatarYue Ma <yuem@codeaurora.org>
parent 773b595b

drivers/net/wireless/cnss2/pci.c

+4 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ 


static DEFINE_SPINLOCK(pci_link_down_lock);

static DEFINE_SPINLOCK(pci_reg_window_lock);

static DEFINE_SPINLOCK(time_sync_lock);



#define MHI_TIMEOUT_OVERWRITE_MS	(plat_priv->ctrl_params.mhi_timeout)
@@ -1007,6 +1008,7 @@ static int cnss_pci_get_device_timestamp(struct cnss_pci_data *pci_priv, 
static int cnss_pci_update_timestamp(struct cnss_pci_data *pci_priv)

{

	struct cnss_plat_data *plat_priv = pci_priv->plat_priv;

	unsigned long flags = 0;

	u64 host_time_us, device_time_us, offset;

	u32 low, high;

	int ret;
@@ -1019,8 +1021,10 @@ static int cnss_pci_update_timestamp(struct cnss_pci_data *pci_priv) 
	if (ret)

		return ret;



	spin_lock_irqsave(&time_sync_lock, flags);

	host_time_us = cnss_get_host_timestamp(plat_priv);

	ret = cnss_pci_get_device_timestamp(pci_priv, &device_time_us);

	spin_unlock_irqrestore(&time_sync_lock, flags);

	if (ret)

		goto force_wake_put;