usb: musb: fix pm_runtime calls while atomic

musb pm_runtime_get_sync call happens in intrrupt context on cable attach case
That can result in re-enabling the interrupts and cause side affects.

So move the code to a work queue.

Following is the error path hit on cable attach:

BUG: sleeping function called from invalid context at drivers/base/power/runtime.c:802
in_atomic(): 0, irqs_disabled(): 0, pid: 18, name: irq/378-twl6030

Backtrace:
[<c00520f0>] (dump_backtrace+0x0/0x110) from [<c054f454>] (dump_stack+0x18/0x1c)
[<c054f43c>] (dump_stack+0x0/0x1c) from [<c007f59c>] (__might_sleep+0x130/0x134)
[<c007f46c>] (__might_sleep+0x0/0x134) from [<c02c2794>] (__pm_runtime_resume+0x94/0x98)
[<c02c2700>] (__pm_runtime_resume+0x0/0x98) from [<c033e7e4>] (musb_otg_notifications+0x9c/0x164)
[<c033e748>] (musb_otg_notifications+0x0/0x164) from [<c00b3df0>] (notifier_call_chain+0x4c/0x8c)
[<c00b3da4>] (notifier_call_chain+0x0/0x8c) from [<c00b44a8>] (__atomic_notifier_call_chain+0x40/0x54)
[<c00b4468>] (__atomic_notifier_call_chain+0x0/0x54) from [<c00b44dc>] (atomic_notifier_call_chain+0x20/0x28)
[<c00b44bc>] (atomic_notifier_call_chain+0x0/0x28) from [<c033f124>] (twl6030_usb_irq+0xc8/0xdc)
[<c033f05c>] (twl6030_usb_irq+0x0/0xdc) from [<c00d79f8>] (irq_thread_fn+0x24/0x40)
[<c00d79d4>] (irq_thread_fn+0x0/0x40) from [<c00d7b64>] (irq_thread+0x150/0x1d8)
[<c00d7a14>] (irq_thread+0x0/0x1d8) from [<c00adf70>] (kthread+0x94/0x98)
[<c00adedc>] (kthread+0x0/0x98) from [<c0094388>] (do_exit+0x0/0x720)

Tested with:
MUSB Device mode: Cold boot / Hot plug
MUSB Host mode: Cold boot / Hot plug

Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Moiz Sonasath <m-sonasath@ti.com>
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 2f6cd431fb1c..fd5dd46039ad 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -227,11 +227,21 @@ static int musb_otg_notifications(struct notifier_block *nb,
                 unsigned long event, void *unused)
 {
         struct musb     *musb = container_of(nb, struct musb, nb);
+
+        musb->xceiv_event = event;
+        schedule_work(&musb->otg_notifier_work);
+
+        return 0;
+}
+
+static void musb_otg_notifier_work(struct work_struct *data_notifier_work)
+{
+        struct musb *musb = container_of(data_notifier_work, struct musb, otg_notifier_work);
         struct device *dev = musb->controller;
         struct musb_hdrc_platform_data *pdata = dev->platform_data;
         struct omap_musb_board_data *data = pdata->board_data;
 
-        switch (event) {
+        switch (musb->xceiv_event) {
         case USB_EVENT_ID:
                 dev_dbg(musb->controller, "ID GND\n");
 
@@ -296,6 +306,8 @@ static int omap2430_musb_init(struct musb *musb)
                 return -ENODEV;
         }
 
+        INIT_WORK(&musb->otg_notifier_work, musb_otg_notifier_work);
+
         status = pm_runtime_get_sync(dev);
         if (status < 0) {
                 dev_err(dev, "pm_runtime_get_sync FAILED");