iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

extcon: Release locking when sending the notification of connector state

Browse Source 
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>
This commit is contained in:
Chanwoo Choi 2018-06-14 11:16:29 +09:00 committed by Greg Kroah-Hartman
parent cbdfa40c81
commit 5f4a5b6fed
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/extcon/extcon.c
View File

@ -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) {