[PATCH] rfkill: disentangle polling pause and suspend
From: Johannes Berg <hidden>
Date: 2016-01-20 09:44:34
Also in:
linux-wireless
Subsystem:
rfkill, the rest · Maintainers:
Johannes Berg, Linus Torvalds
From: Johannes Berg <redacted> When suspended while polling is paused, polling will erroneously resume at resume time. Fix this by tracking pause and suspend in separate state variable and adding the necessary checks. Clarify the documentation on this as well. Signed-off-by: Johannes Berg <redacted> --- include/linux/rfkill.h | 3 ++- net/rfkill/core.c | 17 +++++++++++++++-- 2 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/include/linux/rfkill.h b/include/linux/rfkill.h
index d9010789b4e8..7af625f6d226 100644
--- a/include/linux/rfkill.h
+++ b/include/linux/rfkill.h@@ -104,7 +104,8 @@ int __must_check rfkill_register(struct rfkill *rfkill); * * Pause polling -- say transmitter is off for other reasons. * NOTE: not necessary for suspend/resume -- in that case the - * core stops polling anyway + * core stops polling anyway (but will also correctly handle + * the case of polling having been paused before suspend.) */ void rfkill_pause_polling(struct rfkill *rfkill);
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index f53bf3b6558b..166439995f34 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c@@ -57,6 +57,8 @@ struct rfkill { bool registered; bool persistent; + bool polling_paused; + bool suspended; const struct rfkill_ops *ops; void *data;
@@ -786,6 +788,7 @@ void rfkill_pause_polling(struct rfkill *rfkill) if (!rfkill->ops->poll) return; + rfkill->polling_paused = true; cancel_delayed_work_sync(&rfkill->poll_work); } EXPORT_SYMBOL(rfkill_pause_polling);
@@ -797,6 +800,11 @@ void rfkill_resume_polling(struct rfkill *rfkill) if (!rfkill->ops->poll) return; + rfkill->polling_paused = false; + + if (rfkill->suspended) + return; + queue_delayed_work(system_power_efficient_wq, &rfkill->poll_work, 0); }
@@ -807,7 +815,8 @@ static int rfkill_suspend(struct device *dev) { struct rfkill *rfkill = to_rfkill(dev); - rfkill_pause_polling(rfkill); + rfkill->suspended = true; + cancel_delayed_work_sync(&rfkill->poll_work); return 0; }
@@ -817,12 +826,16 @@ static int rfkill_resume(struct device *dev) struct rfkill *rfkill = to_rfkill(dev); bool cur; + rfkill->suspended = false; + if (!rfkill->persistent) { cur = !!(rfkill->state & RFKILL_BLOCK_SW); rfkill_set_block(rfkill, cur); } - rfkill_resume_polling(rfkill); + if (rfkill->ops->poll && !rfkill->polling_paused) + queue_delayed_work(system_power_efficient_wq, + &rfkill->poll_work, 0); return 0; }
--
2.6.2
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