We can get different results probing reset methods for a device
depending on its power state. For example, reading the PM control
register of a device in D3cold will always indicate NoSoftRst+,
preventing us from correctly probing PM reset support.
Increment the PM usage counter before any probes and use the cleanup
__free facility to automatically drop the usage counter out of scope.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
---
drivers/pci/pci-sysfs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index c6cda56ca52c..71a36f57ef57 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1475,6 +1475,9 @@ static ssize_t reset_method_store(struct device *dev,
return count;
}
+ pm_runtime_get_sync(dev);
+ struct device *pmdev __free(pm_runtime_put) = dev;
+
if (sysfs_streq(buf, "default")) {
pci_init_reset_methods(pdev);
return count;
--
2.48.1
