Patch "PCI/P2PDMA: Fix a sleeping issue in a RCU read section" has been added to the 6.6-stable tree

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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 6.6-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-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 07cad289fedc941571941579aa6d2bf7dd169cb2
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 fa7370f9561ac..b8becc7257cda 100644
--- 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;
 }




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