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

[ Upstream commit 1e5c66a ] 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: ae21f83 ("PCI/P2PDMA: Finish RCU conversion of pdev->p2pdma") Signed-off-by: Christophe JAILLET <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Reviewed-by: Logan Gunthorpe <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
raspberrypi · Mar 26, 2024 · 558d8fe · 558d8fe
1 parent 773264c
commit 558d8fe
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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;
 }