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55 lines
2.2 KiB
Diff
55 lines
2.2 KiB
Diff
From: Hui Wang <hui.wang@canonical.com>
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Date: Wed, 9 Mar 2016 15:25:26 +0800
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Subject: [PATCH] brcmfmac: Remove waitqueue_active check
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We met a problem of pm_suspend when repeated closing/opening the lid
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on a Lenovo laptop (1/20 reproduce rate), below is the log:
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[ 199.735876] PM: Entering mem sleep
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[ 199.750516] e1000e: EEE TX LPI TIMER: 00000011
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[ 199.856638] Trying to free nonexistent resource <000000000000d000-000000000000d0ff>
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[ 201.753566] brcmfmac: brcmf_pcie_suspend: Timeout on response for entering D3 substate
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[ 201.753581] pci_legacy_suspend(): brcmf_pcie_suspend+0x0/0x1f0 [brcmfmac] returns -5
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[ 201.753585] dpm_run_callback(): pci_pm_suspend+0x0/0x160 returns -5
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[ 201.753589] PM: Device 0000:04:00.0 failed to suspend async: error -5
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Through debugging, we found when problem happens, it is not the device
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fails to enter D3, but the signal D3_ACK comes too early to pass the
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waitqueue_active() check.
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Just like this:
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brcmf_pcie_send_mb_data(devinfo, BRCMF_H2D_HOST_D3_INFORM);
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// signal is triggered here
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wait_event_timeout(devinfo->mbdata_resp_wait, devinfo->mbdata_completed,
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BRCMF_PCIE_MBDATA_TIMEOUT);
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So far I think it is safe to remove waitqueue_active check since there
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is only one place to trigger this signal (sending
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BRCMF_H2D_HOST_D3_INFORM). And it is not a problem calling wake_up
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event earlier than calling wait_event.
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Cc: Brett Rudley <brudley@broadcom.com>
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Cc: Hante Meuleman <meuleman@broadcom.com>
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Cc: Franky (Zhenhui) Lin <frankyl@broadcom.com>
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Cc: Pieter-Paul Giesberts <pieterpg@broadcom.com>
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Cc: Arend van Spriel <arend@broadcom.com>
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Signed-off-by: Hui Wang <hui.wang@canonical.com>
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Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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---
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--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
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+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
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@@ -677,10 +677,8 @@ static void brcmf_pcie_handle_mb_data(st
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brcmf_dbg(PCIE, "D2H_MB_DATA: DEEP SLEEP EXIT\n");
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if (dtoh_mb_data & BRCMF_D2H_DEV_D3_ACK) {
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brcmf_dbg(PCIE, "D2H_MB_DATA: D3 ACK\n");
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- if (waitqueue_active(&devinfo->mbdata_resp_wait)) {
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- devinfo->mbdata_completed = true;
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- wake_up(&devinfo->mbdata_resp_wait);
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- }
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+ devinfo->mbdata_completed = true;
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+ wake_up(&devinfo->mbdata_resp_wait);
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}
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}
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