extcon: Release locking when sending the notification of connector state

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>

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 35e9fb8..95e96f0 100644 (file)
--- 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) {