This is a note to let you know that I've just added the patch titled
dmaengine: idxd: skip clearing device context when device is read-only
to the 5.17-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:
dmaengine-idxd-skip-clearing-device-context-when-dev.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4216a065dd272f1c1d35f61b4de9c2f9e9b43563
Author: Dave Jiang <dave.jiang@xxxxxxxxx>
Date: Mon Apr 11 15:06:34 2022 -0700
dmaengine: idxd: skip clearing device context when device is read-only
[ Upstream commit 1cd8e751d96c43ece3f6842ac2244a37d9332c3a ]
If the device shows up as read-only configuration, skip the clearing of the
state as the context must be preserved for device re-enable after being
disabled.
Fixes: 0dcfe41e9a4c ("dmanegine: idxd: cleanup all device related bits after disabling device")
Reported-by: Tony Zhu <tony.zhu@xxxxxxxxx>
Tested-by: Tony Zhu <tony.zhu@xxxxxxxxx>
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Link: https://lore.kernel.org/r/164971479479.2200566.13980022473526292759.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index 5a0535a0f850..f652da6ab47d 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -708,6 +708,9 @@ static void idxd_device_wqs_clear_state(struct idxd_device *idxd)
void idxd_device_clear_state(struct idxd_device *idxd)
{
+ if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
+ return;
+
idxd_groups_clear_state(idxd);
idxd_engines_clear_state(idxd);
idxd_device_wqs_clear_state(idxd);
