[PATCH] mfd: intel-lpss: Check for error irq

Jiasheng Jiang
2021-12-24T02:34:15Z

For the possible failure of the platform_get_irq(), the returned irq
could be error number and will finally cause the failure of the
request_irq().
Consider that platform_get_irq() can now in certain cases return
-EPROBE_DEFER, and the consequences of letting request_irq() effectively
convert that into -EINVAL, even at probe time rather than later on.
So it might be better to check just now.

Fixes: 4b45efe85263 ("mfd: Add support for Intel Sunrisepoint LPSS devices")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
drivers/mfd/intel-lpss-acpi.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/intel-lpss-acpi.c b/drivers/mfd/intel-lpss-acpi.c
index 1f396039d58f..2c073aa294ed 100644
--- a/drivers/mfd/intel-lpss-acpi.c
+++ b/drivers/mfd/intel-lpss-acpi.c
@@ -118,6 +118,7 @@ static int intel_lpss_acpi_probe(struct platform_device *pdev)
{
struct intel_lpss_platform_info *info;
const struct acpi_device_id *id;
+ int ret;

id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev);
if (!id)
@@ -129,7 +130,12 @@ static int intel_lpss_acpi_probe(struct platform_device *pdev)
return -ENOMEM;

info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- info->irq = platform_get_irq(pdev, 0);
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ return ret;
+
+ info->irq = ret;

pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
--
2.25.1