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| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2018-05-23 16:53:20 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-24 18:09:37 +0200 |
| commit | 681e9485241463e1e8d8cfd0a11fb252f49c997f (patch) | |
| tree | 8c28668617df61b5bf0be60f3773f601a27299c2 /drivers/usb/mtu3/mtu3_dr.c | |
| parent | 4f9f032c256c3fc8ed23461e71d7acf3363a969f (diff) | |
| download | linux-681e9485241463e1e8d8cfd0a11fb252f49c997f.tar.gz linux-681e9485241463e1e8d8cfd0a11fb252f49c997f.tar.bz2 linux-681e9485241463e1e8d8cfd0a11fb252f49c997f.zip | |
usb: mtu3: fix warning of sleep in atomic context in notifier callback
The notifier callbacks of extcon are called in atomic context, but the
callbacks will call regulator_enable()/regulator_disable() which may
sleep caused by mutex, so use work queue to call the sleep functions.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/mtu3/mtu3_dr.c')
| -rw-r--r-- | drivers/usb/mtu3/mtu3_dr.c | 44 |
1 files changed, 36 insertions, 8 deletions
diff --git a/drivers/usb/mtu3/mtu3_dr.c b/drivers/usb/mtu3/mtu3_dr.c index 80083e092948..8c3bbf732bc4 100644 --- a/drivers/usb/mtu3/mtu3_dr.c +++ b/drivers/usb/mtu3/mtu3_dr.c @@ -174,16 +174,40 @@ static void ssusb_set_mailbox(struct otg_switch_mtk *otg_sx, } } -static int ssusb_id_notifier(struct notifier_block *nb, - unsigned long event, void *ptr) +static void ssusb_id_work(struct work_struct *work) { struct otg_switch_mtk *otg_sx = - container_of(nb, struct otg_switch_mtk, id_nb); + container_of(work, struct otg_switch_mtk, id_work); - if (event) + if (otg_sx->id_event) ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND); else ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT); +} + +static void ssusb_vbus_work(struct work_struct *work) +{ + struct otg_switch_mtk *otg_sx = + container_of(work, struct otg_switch_mtk, vbus_work); + + if (otg_sx->vbus_event) + ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID); + else + ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF); +} + +/* + * @ssusb_id_notifier is called in atomic context, but @ssusb_set_mailbox + * may sleep, so use work queue here + */ +static int ssusb_id_notifier(struct notifier_block *nb, + unsigned long event, void *ptr) +{ + struct otg_switch_mtk *otg_sx = + container_of(nb, struct otg_switch_mtk, id_nb); + + otg_sx->id_event = event; + schedule_work(&otg_sx->id_work); return NOTIFY_DONE; } @@ -194,10 +218,8 @@ static int ssusb_vbus_notifier(struct notifier_block *nb, struct otg_switch_mtk *otg_sx = container_of(nb, struct otg_switch_mtk, vbus_nb); - if (event) - ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID); - else - ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF); + otg_sx->vbus_event = event; + schedule_work(&otg_sx->vbus_work); return NOTIFY_DONE; } @@ -398,6 +420,9 @@ int ssusb_otg_switch_init(struct ssusb_mtk *ssusb) { struct otg_switch_mtk *otg_sx = &ssusb->otg_switch; + INIT_WORK(&otg_sx->id_work, ssusb_id_work); + INIT_WORK(&otg_sx->vbus_work, ssusb_vbus_work); + if (otg_sx->manual_drd_enabled) ssusb_debugfs_init(ssusb); else @@ -412,4 +437,7 @@ void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb) if (otg_sx->manual_drd_enabled) ssusb_debugfs_exit(ssusb); + + cancel_work_sync(&otg_sx->id_work); + cancel_work_sync(&otg_sx->vbus_work); } |