4.14-stable review patch. If anyone has any objections, please let me know.
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From: Chanwoo Choi cw00.choi@samsung.com
commit 8a9dbb779fe882325b9a0238494a7afaff2eb444 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/extcon/extcon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/extcon/extcon.c +++ b/drivers/extcon/extcon.c @@ -433,8 +433,8 @@ int extcon_sync(struct extcon_dev *edev, 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, */ 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) {