| Message ID | a1437e413116364ac9f3b777c7922ca0728ddc0d.1658176701.git.sean.wang@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/4] mt76: mt7921e: fix race issue between reset and suspend/resume | expand |
> From: Sean Wang <sean.wang@mediatek.com> > > It is unexpected that the reset work is running simultaneously with > the suspend or resume context and it is possible that reset work is still > running even after mt7921 is suspended if we don't fix the race issue. > > Thus, the suspend procedure should be waiting until the reset is completed > at the beginning and ignore the subsequent the reset requests. > > In case there is an error that happens during either suspend or resume > handler, we will schedule a reset task to recover the error before > returning the error code to ensure we can immediately fix the error there. > > Fixes: 0c1ce9884607 ("mt76: mt7921: add wifi reset support") > Co-developed-by: YN Chen <YN.Chen@mediatek.com> > Signed-off-by: YN Chen <YN.Chen@mediatek.com> > Signed-off-by: Sean Wang <sean.wang@mediatek.com> > --- > drivers/net/wireless/mediatek/mt76/mt7921/mac.c | 5 +++++ > drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 13 +++++++++---- > 2 files changed, 14 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c > index 47f0aa81ab02..6bd9fc9228a2 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c > +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c > @@ -780,6 +780,7 @@ void mt7921_mac_reset_work(struct work_struct *work) > void mt7921_reset(struct mt76_dev *mdev) > { > struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76); > + struct mt76_connac_pm *pm = &dev->pm; > > if (!dev->hw_init_done) > return; > @@ -787,8 +788,12 @@ void mt7921_reset(struct mt76_dev *mdev) > if (dev->hw_full_reset) > return; > > + if (pm->suspended) > + return; > + > queue_work(dev->mt76.wq, &dev->reset_work); > } > +EXPORT_SYMBOL_GPL(mt7921_reset); > > void mt7921_mac_update_mib_stats(struct mt7921_phy *phy) > { > diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c > index 9d1ba838e54f..07573ea55389 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c > +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c > @@ -363,6 +363,7 @@ static int mt7921_pci_suspend(struct device *device) > int i, err; > > pm->suspended = true; > + cancel_work_sync(&dev->reset_work); should we just wait for the reset to complete here instead of cancelling? (e.g. flush_work) Regards, Lorenzo > cancel_delayed_work_sync(&pm->ps_work); > cancel_work_sync(&pm->wake_work); > > @@ -424,6 +425,9 @@ static int mt7921_pci_suspend(struct device *device) > restore_suspend: > pm->suspended = false; > > + if (err < 0) > + mt7921_reset(&dev->mt76); > + > return err; > } > > @@ -437,7 +441,7 @@ static int mt7921_pci_resume(struct device *device) > > err = mt7921_mcu_drv_pmctrl(dev); > if (err < 0) > - return err; > + goto failed; > > mt7921_wpdma_reinit_cond(dev); > > @@ -467,11 +471,12 @@ static int mt7921_pci_resume(struct device *device) > mt76_connac_mcu_set_deep_sleep(&dev->mt76, false); > > err = mt76_connac_mcu_set_hif_suspend(mdev, false); > - if (err) > - return err; > - > +failed: > pm->suspended = false; > > + if (err < 0) > + mt7921_reset(&dev->mt76); > + > return err; > } > > -- > 2.25.1 >
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c index 47f0aa81ab02..6bd9fc9228a2 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c @@ -780,6 +780,7 @@ void mt7921_mac_reset_work(struct work_struct *work) void mt7921_reset(struct mt76_dev *mdev) { struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76); + struct mt76_connac_pm *pm = &dev->pm; if (!dev->hw_init_done) return; @@ -787,8 +788,12 @@ void mt7921_reset(struct mt76_dev *mdev) if (dev->hw_full_reset) return; + if (pm->suspended) + return; + queue_work(dev->mt76.wq, &dev->reset_work); } +EXPORT_SYMBOL_GPL(mt7921_reset); void mt7921_mac_update_mib_stats(struct mt7921_phy *phy) { diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c index 9d1ba838e54f..07573ea55389 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c @@ -363,6 +363,7 @@ static int mt7921_pci_suspend(struct device *device) int i, err; pm->suspended = true; + cancel_work_sync(&dev->reset_work); cancel_delayed_work_sync(&pm->ps_work); cancel_work_sync(&pm->wake_work); @@ -424,6 +425,9 @@ static int mt7921_pci_suspend(struct device *device) restore_suspend: pm->suspended = false; + if (err < 0) + mt7921_reset(&dev->mt76); + return err; } @@ -437,7 +441,7 @@ static int mt7921_pci_resume(struct device *device) err = mt7921_mcu_drv_pmctrl(dev); if (err < 0) - return err; + goto failed; mt7921_wpdma_reinit_cond(dev); @@ -467,11 +471,12 @@ static int mt7921_pci_resume(struct device *device) mt76_connac_mcu_set_deep_sleep(&dev->mt76, false); err = mt76_connac_mcu_set_hif_suspend(mdev, false); - if (err) - return err; - +failed: pm->suspended = false; + if (err < 0) + mt7921_reset(&dev->mt76); + return err; }