generic: 5.15: fix affinity warning for qcom target

Backport a patch from 5.18 that fix affinity warning from qcom pinctrl driver.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

target/linux/generic/backport-5.15/300-v5.18-pinctrl-qcom-Return--EINVAL-for-setting-affinity-if-no-IRQ-parent.patch

@@ -0,0 +1,50 @@
+From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+To: linus.walleij@linaro.org
+Cc: bjorn.andersson@linaro.org, dianders@chromium.org,
+        linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org,
+        linux-kernel@vger.kernel.org,
+        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+Subject: [PATCH] pinctrl: qcom: Return -EINVAL for setting affinity if no IRQ
+ parent
+Date: Thu, 13 Jan 2022 21:56:17 +0530
+Message-Id: <20220113162617.131697-1-manivannan.sadhasivam@linaro.org>
+
+The MSM GPIO IRQ controller relies on the parent IRQ controller to set the
+CPU affinity for the IRQ. And this is only valid if there is any wakeup
+parent available and defined in DT.
+
+For the case of no parent IRQ controller defined in DT,
+msm_gpio_irq_set_affinity() and msm_gpio_irq_set_vcpu_affinity() should
+return -EINVAL instead of 0 as the affinity can't be set.
+
+Otherwise, below warning will be printed by genirq:
+
+genirq: irq_chip msmgpio did not update eff. affinity mask of irq 70
+
+Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+---
+ drivers/pinctrl/qcom/pinctrl-msm.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
+index 8476a8ac4451..a42ff4b22a04 100644
+--- a/drivers/pinctrl/qcom/pinctrl-msm.c
++++ b/drivers/pinctrl/qcom/pinctrl-msm.c
+@@ -1157,7 +1157,7 @@ static int msm_gpio_irq_set_affinity(struct irq_data *d,
+ 	if (d->parent_data && test_bit(d->hwirq, pctrl->skip_wake_irqs))
+ 		return irq_chip_set_affinity_parent(d, dest, force);
+
+-	return 0;
++	return -EINVAL;
+ }
+
+ static int msm_gpio_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
+@@ -1168,7 +1168,7 @@ static int msm_gpio_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
+ 	if (d->parent_data && test_bit(d->hwirq, pctrl->skip_wake_irqs))
+ 		return irq_chip_set_vcpu_affinity_parent(d, vcpu_info);
+
+-	return 0;
++	return -EINVAL;
+ }
+
+ static void msm_gpio_irq_handler(struct irq_desc *desc)