linux-kernel - [PATCH 5.17 052/146] dmaengine: idxd: skip clearing device context when device is read-only

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Date:   Tue, 26 Apr 2022 10:20:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tony Zhu <tony.zhu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 052/146] dmaengine: idxd: skip clearing device context when device is read-only

From: Dave Jiang <dave.jiang@...el.com>

[ 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@...el.com>
Tested-by: Tony Zhu <tony.zhu@...el.com>
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
Link: https://lore.kernel.org/r/164971479479.2200566.13980022473526292759.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/idxd/device.c | 3 +++
 1 file changed, 3 insertions(+)

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);
-- 
2.35.1