PCI/P2PDMA: Fix a sleeping issue in a RCU read section

[ Upstream commit 1e5c66afd4a40bb7be17cb33cbb1a1085f727730 ]

It is not allowed to sleep within a RCU read section, so use GFP_ATOMIC
instead of GFP_KERNEL here.

Link: https://lore.kernel.org/r/02d9ec4a10235def0e764ff1f5be881ba12e16e8.1704397858.git.christophe.jaillet@wanadoo.fr
Fixes: ae21f835a5bd ("PCI/P2PDMA: Finish RCU conversion of pdev->p2pdma")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 0c361561b855c1bde88c43266baa04afb9554622..4f47a13cb500ff5339cde426b6ccb020fcd74ae7 100644 (file)
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -661,7 +661,7 @@ calc_map_type_and_dist(struct pci_dev *provider, struct pci_dev *client,
        p2pdma = rcu_dereference(provider->p2pdma);
        if (p2pdma)
                xa_store(&p2pdma->map_types, map_types_idx(client),
-                        xa_mk_value(map_type), GFP_KERNEL);
+                        xa_mk_value(map_type), GFP_ATOMIC);
        rcu_read_unlock();
        return map_type;
 }