pinctrl: qcom: Assign irq_eoi conditionally

The hierarchical parts of MSM pinctrl/GPIO is only
used when the device tree has a "wakeup-parent" as
a phandle, but the .irq_eoi is anyway assigned leading
to semantic problems on elder Qualcomm chipsets.

When the drivers/mfd/qcom-pm8xxx.c driver calls
chained_irq_exit() that call will in turn call chip->irq_eoi()
which is set to irq_chip_eoi_parent() by default on a
hierachical IRQ chip, and the parent is pinctrl-msm.c
so that will in turn unconditionally call
irq_chip_eoi_parent() again, but its parent is invalid
so we get the following crash:

 Unnable to handle kernel NULL pointer dereference at
 virtual address 00000010
 pgd = (ptrval)
 [00000010] *pgd=00000000
 Internal error: Oops: 5 [#1] PREEMPT SMP ARM
 (...)
 PC is at irq_chip_eoi_parent+0x4/0x10
 LR is at pm8xxx_irq_handler+0x1b4/0x2d8

If we solve this crash by avoiding to call up to
irq_chip_eoi_parent(), the machine will hang and get
reset by the watchdog, because of semantic issues,
probably inside irq_chip.

As a solution, just assign the .irq_eoi conditionally if
we are actually using a wakeup parent.

Cc: David Heidelberg <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Lina Iyer <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: [email protected]
Fixes: e35a6ae ("pinctrl/msm: Setup GPIO chip in hierarchy")
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Tested-by: David Heidelberg <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

drivers/pinctrl/qcom/pinctrl-msm.c

@@ -1104,7 +1104,6 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
 	pctrl->irq_chip.irq_mask = msm_gpio_irq_mask;
 	pctrl->irq_chip.irq_unmask = msm_gpio_irq_unmask;
 	pctrl->irq_chip.irq_ack = msm_gpio_irq_ack;
-	pctrl->irq_chip.irq_eoi = irq_chip_eoi_parent;
 	pctrl->irq_chip.irq_set_type = msm_gpio_irq_set_type;
 	pctrl->irq_chip.irq_set_wake = msm_gpio_irq_set_wake;
 	pctrl->irq_chip.irq_request_resources = msm_gpio_irq_reqres;
@@ -1118,7 +1117,7 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
 		if (!chip->irq.parent_domain)
 			return -EPROBE_DEFER;
 		chip->irq.child_to_parent_hwirq = msm_gpio_wakeirq;
-
+		pctrl->irq_chip.irq_eoi = irq_chip_eoi_parent;
 		/*
 		 * Let's skip handling the GPIOs, if the parent irqchip
 		 * is handling the direct connect IRQ of the GPIO.