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authorChanwoo Choi <cw00.choi@samsung.com>2018-06-14 11:16:29 +0900
committerChanwoo Choi <cw00.choi@samsung.com>2018-07-12 09:06:31 +0900
commit8a9dbb779fe882325b9a0238494a7afaff2eb444 (patch)
tree9336d0a22a8fd604815f6bfd1620258932a2e0be /drivers/extcon
parent11bab5a28d4cb22f816beaed697ebf715730f96a (diff)
downloadlinux-8a9dbb779fe882325b9a0238494a7afaff2eb444.tar.bz2
extcon: Release locking when sending the notification of connector state
Previously, extcon used the spinlock before calling the notifier_call_chain to prevent the scheduled out of task and to prevent the notification delay. When spinlock is locked for sending the notification, deadlock issue occured on the side of extcon consumer device. To fix this issue, extcon consumer device should always use the work. it is always not reasonable to use work. To fix this issue on extcon consumer device, release locking when sending the notification of connector state. Fixes: ab11af049f88 ("extcon: Add the synchronization extcon APIs to support the notification") Cc: stable@vger.kernel.org Cc: Roger Quadros <rogerq@ti.com> Cc: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index af83ad58819c..b9d27c8fe57e 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -433,8 +433,8 @@ int extcon_sync(struct extcon_dev *edev, unsigned int id)
return index;
spin_lock_irqsave(&edev->lock, flags);
-
state = !!(edev->state & BIT(index));
+ spin_unlock_irqrestore(&edev->lock, flags);
/*
* Call functions in a raw notifier chain for the specific one
@@ -448,6 +448,7 @@ int extcon_sync(struct extcon_dev *edev, unsigned int id)
*/
raw_notifier_call_chain(&edev->nh_all, state, edev);
+ spin_lock_irqsave(&edev->lock, flags);
/* This could be in interrupt handler */
prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
if (!prop_buf) {