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usb: musb: core: add pm_runtime_irq_safe()

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We need a pm_runtime_get_sync() call from
within musb_gadget_pullup() to make sure
registers are accessible at that time.

The problem is that musb_gadget_pullup() is
called with IRQs disabled and, because of that,
we need to tell pm_runtime that this pm_runtime_get_sync()
is IRQ safe.

We can simply add pm_runtime_irq_safe(), however, because
we need to make our read/write accessor function pointers
have been initialized before trying to use them. This means
that all pm_runtime initialization for musb_core needs to
be moved down so that when we call pm_runtime_irq_safe(),
the pm_runtime_get_sync() that it calls on the parent, won't
cause a crash due to NULL musb_read/write accessors.

Reported-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi 2015-02-02 17:12:00 -06:00
parent 9ec36f7fe2
commit 3e43a07256
1 changed files with 6 additions and 4 deletions
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10
drivers/usb/musb/musb_core.c
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@ -1969,10 +1969,6 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
goto fail0;
}
pm_runtime_use_autosuspend(musb->controller);
pm_runtime_set_autosuspend_delay(musb->controller, 200);
pm_runtime_enable(musb->controller);
spin_lock_init(&musb->lock);
musb->board_set_power = plat->set_power;
musb->min_power = plat->min_power;
@ -1991,6 +1987,12 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
musb_readl = musb_default_readl;
musb_writel = musb_default_writel;
/* We need musb_read/write functions initialized for PM */
pm_runtime_use_autosuspend(musb->controller);
pm_runtime_set_autosuspend_delay(musb->controller, 200);
pm_runtime_irq_safe(musb->controller);
pm_runtime_enable(musb->controller);
/* The musb_platform_init() call:
* - adjusts musb->mregs
* - sets the musb->isr