diff options
Diffstat (limited to 'package/kernel/mac80211/patches/345-brcmfmac-Remove-waitqueue_active-check.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/345-brcmfmac-Remove-waitqueue_active-check.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/345-brcmfmac-Remove-waitqueue_active-check.patch b/package/kernel/mac80211/patches/345-brcmfmac-Remove-waitqueue_active-check.patch new file mode 100644 index 0000000000..39f438321e --- /dev/null +++ b/package/kernel/mac80211/patches/345-brcmfmac-Remove-waitqueue_active-check.patch @@ -0,0 +1,54 @@ +From: Hui Wang <hui.wang@canonical.com> +Date: Wed, 9 Mar 2016 15:25:26 +0800 +Subject: [PATCH] brcmfmac: Remove waitqueue_active check + +We met a problem of pm_suspend when repeated closing/opening the lid +on a Lenovo laptop (1/20 reproduce rate), below is the log: + +[ 199.735876] PM: Entering mem sleep +[ 199.750516] e1000e: EEE TX LPI TIMER: 00000011 +[ 199.856638] Trying to free nonexistent resource <000000000000d000-000000000000d0ff> +[ 201.753566] brcmfmac: brcmf_pcie_suspend: Timeout on response for entering D3 substate +[ 201.753581] pci_legacy_suspend(): brcmf_pcie_suspend+0x0/0x1f0 [brcmfmac] returns -5 +[ 201.753585] dpm_run_callback(): pci_pm_suspend+0x0/0x160 returns -5 +[ 201.753589] PM: Device 0000:04:00.0 failed to suspend async: error -5 + +Through debugging, we found when problem happens, it is not the device +fails to enter D3, but the signal D3_ACK comes too early to pass the +waitqueue_active() check. + +Just like this: +brcmf_pcie_send_mb_data(devinfo, BRCMF_H2D_HOST_D3_INFORM); +// signal is triggered here +wait_event_timeout(devinfo->mbdata_resp_wait, devinfo->mbdata_completed, + BRCMF_PCIE_MBDATA_TIMEOUT); + +So far I think it is safe to remove waitqueue_active check since there +is only one place to trigger this signal (sending +BRCMF_H2D_HOST_D3_INFORM). And it is not a problem calling wake_up +event earlier than calling wait_event. + +Cc: Brett Rudley <brudley@broadcom.com> +Cc: Hante Meuleman <meuleman@broadcom.com> +Cc: Franky (Zhenhui) Lin <frankyl@broadcom.com> +Cc: Pieter-Paul Giesberts <pieterpg@broadcom.com> +Cc: Arend van Spriel <arend@broadcom.com> +Signed-off-by: Hui Wang <hui.wang@canonical.com> +Signed-off-by: Kalle Valo <kvalo@codeaurora.org> +--- + +--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c ++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c +@@ -677,10 +677,8 @@ static void brcmf_pcie_handle_mb_data(st + brcmf_dbg(PCIE, "D2H_MB_DATA: DEEP SLEEP EXIT\n"); + if (dtoh_mb_data & BRCMF_D2H_DEV_D3_ACK) { + brcmf_dbg(PCIE, "D2H_MB_DATA: D3 ACK\n"); +- if (waitqueue_active(&devinfo->mbdata_resp_wait)) { +- devinfo->mbdata_completed = true; +- wake_up(&devinfo->mbdata_resp_wait); +- } ++ devinfo->mbdata_completed = true; ++ wake_up(&devinfo->mbdata_resp_wait); + } + } + |