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PCI: endpoint: Fix configfs group removal on driver teardown

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commit 910bdb8197f9322790c738bb32feaa11dba26909 upstream.

An endpoint driver configfs attributes group is added to the
epf_group list of struct pci_epf_driver by pci_epf_add_cfs() but an
added group is not removed from this list when the attribute group is
unregistered with pci_ep_cfs_remove_epf_group().

Add the missing list_del() call in pci_ep_cfs_remove_epf_group()
to correctly remove the attribute group from the driver list.

With this change, once the loop over all attribute groups in
pci_epf_remove_cfs() completes, the driver epf_group list should be
empty. Add a WARN_ON() to make sure of that.

Fixes: ef1433f717 ("PCI: endpoint: Create configfs entry for each pci_epf_device_id table entry")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250624114544.342159-3-dlemoal@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Damien Le Moal 2025-06-24 20:45:44 +09:00 • committed by Greg Kroah-Hartman
commit f6419ccc88
2 changed files with 2 additions and 0 deletions
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1
drivers/pci/endpoint/pci-ep-cfs.c
View file

@ -480,6 +480,7 @@ void pci_ep_cfs_remove_epf_group(struct config_group *group)
if (IS_ERR_OR_NULL(group))
return;
list_del(&group->group_entry);
configfs_unregister_default_group(group);
}
EXPORT_SYMBOL(pci_ep_cfs_remove_epf_group);

1
drivers/pci/endpoint/pci-epf-core.c
View file

@ -155,6 +155,7 @@ static void pci_epf_remove_cfs(struct pci_epf_driver *driver)
mutex_lock(&pci_epf_mutex);
list_for_each_entry_safe(group, tmp, &driver->epf_group, group_entry)
pci_ep_cfs_remove_epf_group(group);
WARN_ON(!list_empty(&driver->epf_group));
mutex_unlock(&pci_epf_mutex);
}