This is a note to let you know that I've just added the patch titled
PCI/P2PDMA: Fix a sleeping issue in a RCU read section
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-p2pdma-fix-a-sleeping-issue-in-a-rcu-read-sectio.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2fcef39cdf01286c73bb797e934e1e374f15c97c
Author: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Date: Thu Jan 4 20:52:35 2024 +0100
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@xxxxxxxxxx
Fixes: ae21f835a5bd ("PCI/P2PDMA: Finish RCU conversion of pdev->p2pdma")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 316fd2f44df45..57654c82b08e8 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -536,7 +536,7 @@ 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;
}
