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PCI: Increment PM usage counter when probing reset methods

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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+ because we get ~0 data
when the config read fails on PCI, 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@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250422230534.2295291-3-alex.williamson@redhat.com
This commit is contained in:
Alex Williamson
2025-04-23 16:06:45 -05:00
committed by Bjorn Helgaas
parent bfa4477751
commit 0a0829b1fd
1 changed files with 3 additions and 0 deletions
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drivers/pci/pci-sysfs.c
+3
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@@ -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;