| Message ID | 20190224140426.3267-4-marc.zyngier@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mwifiex PCI/wake-up interrupt fixes | expand |
Hi Marc, On Sun, Feb 24, 2019 at 02:04:25PM +0000, Marc Zyngier wrote: > The mwifiex driver makes unsafe assumptions about the state of the > wake-up interrupt. It requests it and only then disable it. Of > course, the interrupt may be screaming for whatever reason at that > time, and the handler will then be called without the interrupt > having been registered with the PM/wakeup subsystem. Oops. > > The right way to handle this kind of situation is to flag the > interrupt with IRQ_NOAUTOEN before requesting it. It will then > stay disabled until someone (the wake-up subsystem) enables it. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> This could be: Fixes: 853402a00823 ("mwifiex: Enable WoWLAN for both sdio and pcie") although, that was just borrowing the existing antipattern from SDIO code.. Reviewed-by: Brian Norris <briannorris@chromium.org> Thanks. > --- > drivers/net/wireless/marvell/mwifiex/main.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c > index 2105c2b7c627..82cf35e50579 100644 > --- a/drivers/net/wireless/marvell/mwifiex/main.c > +++ b/drivers/net/wireless/marvell/mwifiex/main.c > @@ -1610,6 +1610,7 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter) > "wake-up interrupt outside 'wake-up' subnode of %pOF\n", > adapter->dt_node); > > + irq_set_status_flags(adapter->irq_wakeup, IRQ_NOAUTOEN); > ret = devm_request_irq(dev, adapter->irq_wakeup, > mwifiex_irq_wakeup_handler, IRQF_TRIGGER_LOW, > "wifi_wake", adapter); > @@ -1619,7 +1620,6 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter) > goto err_exit; > } > > - disable_irq(adapter->irq_wakeup); > if (device_init_wakeup(dev, true)) { > dev_err(dev, "fail to init wakeup for mwifiex\n"); > goto err_exit; > -- > 2.20.1 >
On Tue, Feb 26, 2019 at 03:31:31PM -0800, Brian Norris wrote: > Hi Marc, > > On Sun, Feb 24, 2019 at 02:04:25PM +0000, Marc Zyngier wrote: > > The mwifiex driver makes unsafe assumptions about the state of the > > wake-up interrupt. It requests it and only then disable it. Of > > course, the interrupt may be screaming for whatever reason at that > > time, and the handler will then be called without the interrupt > > having been registered with the PM/wakeup subsystem. Oops. > > > > The right way to handle this kind of situation is to flag the > > interrupt with IRQ_NOAUTOEN before requesting it. It will then > > stay disabled until someone (the wake-up subsystem) enables it. > > > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> > > This could be: > > Fixes: 853402a00823 ("mwifiex: Enable WoWLAN for both sdio and pcie") Also, this comes after a different change (that's not quite as clearly a backport-able bugfix). Perhaps it should go first in the series? Brian > although, that was just borrowing the existing antipattern from SDIO > code.. > > Reviewed-by: Brian Norris <briannorris@chromium.org> > > Thanks. > > > --- > > drivers/net/wireless/marvell/mwifiex/main.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c > > index 2105c2b7c627..82cf35e50579 100644 > > --- a/drivers/net/wireless/marvell/mwifiex/main.c > > +++ b/drivers/net/wireless/marvell/mwifiex/main.c > > @@ -1610,6 +1610,7 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter) > > "wake-up interrupt outside 'wake-up' subnode of %pOF\n", > > adapter->dt_node); > > > > + irq_set_status_flags(adapter->irq_wakeup, IRQ_NOAUTOEN); > > ret = devm_request_irq(dev, adapter->irq_wakeup, > > mwifiex_irq_wakeup_handler, IRQF_TRIGGER_LOW, > > "wifi_wake", adapter); > > @@ -1619,7 +1620,6 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter) > > goto err_exit; > > } > > > > - disable_irq(adapter->irq_wakeup); > > if (device_init_wakeup(dev, true)) { > > dev_err(dev, "fail to init wakeup for mwifiex\n"); > > goto err_exit; > > -- > > 2.20.1 > >
Marc Zyngier <marc.zyngier@arm.com> wrote: > The mwifiex driver makes unsafe assumptions about the state of the > wake-up interrupt. It requests it and only then disable it. Of > course, the interrupt may be screaming for whatever reason at that > time, and the handler will then be called without the interrupt > having been registered with the PM/wakeup subsystem. Oops. > > The right way to handle this kind of situation is to flag the > interrupt with IRQ_NOAUTOEN before requesting it. It will then > stay disabled until someone (the wake-up subsystem) enables it. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> > Reviewed-by: Brian Norris <briannorris@chromium.org> Failed to apply: fatal: sha1 information is lacking or useless (drivers/net/wireless/marvell/mwifiex/main.c). error: could not build fake ancestor Applying: mwifiex: Flag wake-up interrupt as IRQ_NOAUTOEN rather than disabling it too late Patch failed at 0001 mwifiex: Flag wake-up interrupt as IRQ_NOAUTOEN rather than disabling it too late The copy of the patch that failed is found in: .git/rebase-apply/patch Patch set to Changes Requested.
diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c index 2105c2b7c627..82cf35e50579 100644 --- a/drivers/net/wireless/marvell/mwifiex/main.c +++ b/drivers/net/wireless/marvell/mwifiex/main.c @@ -1610,6 +1610,7 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter) "wake-up interrupt outside 'wake-up' subnode of %pOF\n", adapter->dt_node); + irq_set_status_flags(adapter->irq_wakeup, IRQ_NOAUTOEN); ret = devm_request_irq(dev, adapter->irq_wakeup, mwifiex_irq_wakeup_handler, IRQF_TRIGGER_LOW, "wifi_wake", adapter); @@ -1619,7 +1620,6 @@ static void mwifiex_probe_of(struct mwifiex_adapter *adapter) goto err_exit; } - disable_irq(adapter->irq_wakeup); if (device_init_wakeup(dev, true)) { dev_err(dev, "fail to init wakeup for mwifiex\n"); goto err_exit;
The mwifiex driver makes unsafe assumptions about the state of the wake-up interrupt. It requests it and only then disable it. Of course, the interrupt may be screaming for whatever reason at that time, and the handler will then be called without the interrupt having been registered with the PM/wakeup subsystem. Oops. The right way to handle this kind of situation is to flag the interrupt with IRQ_NOAUTOEN before requesting it. It will then stay disabled until someone (the wake-up subsystem) enables it. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- drivers/net/wireless/marvell/mwifiex/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)