[PATCH 6.6.y v2 2/2] dmaengine: idxd: Fix leaking event log memory

[Wenshan Lan]

From: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>

[ Upstream commit ee66bc29578391c9b48523dc9119af67bd5c7c0f ]

During the device remove process, the device is reset, causing the
configuration registers to go back to their default state, which is
zero. As the driver is checking if the event log support was enabled
before deallocating, it will fail if a reset happened before.

Do not check if the support was enabled, the check for 'idxd->evl'
being valid (only allocated if the HW capability is available) is
enough.

Fixes: 244da66cda35 ("dmaengine: idxd: setup event log configuration")
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
Link: https://patch.msgid.link/20260121-idxd-fix-flr-on-kernel-queues-v3-v3-10-7ed70658a9d1@xxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Wenshan Lan <jetlan9@xxxxxxx>
---
 drivers/dma/idxd/device.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index e769e1f0d28b..13af4ef2f43f 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -813,10 +813,6 @@ static void idxd_device_evl_free(struct idxd_device *idxd)
 	if (!evl)
 		return;
 
-	gencfg.bits = ioread32(idxd->reg_base + IDXD_GENCFG_OFFSET);
-	if (!gencfg.evl_en)
-		return;
-
 	mutex_lock(&evl->lock);
 	gencfg.evl_en = 0;
 	iowrite32(gencfg.bits, idxd->reg_base + IDXD_GENCFG_OFFSET);
-- 
2.43.0