soc: mediatek: mtk-svs: Enable the IRQ later

If the system does not come from reset (like when is booted via
kexec()), the peripheral might triger an IRQ before the data structures
are initialised.

Fixes:

[    0.227710] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000f08
[    0.227913] Call trace:
[    0.227918]  svs_isr+0x8c/0x538

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20221127-mtk-svs-v2-0-145b07663ea8@chromium.org
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
index 0469c9d..75b2f53 100644 (file)
--- a/drivers/soc/mediatek/mtk-svs.c
+++ b/drivers/soc/mediatek/mtk-svs.c
@@ -2385,14 +2385,6 @@ static int svs_probe(struct platform_device *pdev)
                goto svs_probe_free_resource;
        }
 
-       ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
-                                       IRQF_ONESHOT, svsp->name, svsp);
-       if (ret) {
-               dev_err(svsp->dev, "register irq(%d) failed: %d\n",
-                       svsp_irq, ret);
-               goto svs_probe_free_resource;
-       }
-
        svsp->main_clk = devm_clk_get(svsp->dev, "main");
        if (IS_ERR(svsp->main_clk)) {
                dev_err(svsp->dev, "failed to get clock: %ld\n",
@@ -2414,6 +2406,14 @@ static int svs_probe(struct platform_device *pdev)
                goto svs_probe_clk_disable;
        }
 
+       ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
+                                       IRQF_ONESHOT, svsp->name, svsp);
+       if (ret) {
+               dev_err(svsp->dev, "register irq(%d) failed: %d\n",
+                       svsp_irq, ret);
+               goto svs_probe_iounmap;
+       }
+
        ret = svs_start(svsp);
        if (ret) {
                dev_err(svsp->dev, "svs start fail: %d\n", ret);