linux-kernel - [PATCH 5.16 0924/1039] dmaengine: idxd: fix wq settings post wq disable

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Date:   Mon, 24 Jan 2022 19:45:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lucas Van <lucas.van@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 5.16 0924/1039] dmaengine: idxd: fix wq settings post wq disable

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

commit 0f225705cf6536826318180831e18a74595efc8d upstream.

By the spec, wq size and group association is not changeable unless device
is disabled. Exclude clearing the shadow copy on wq disable/reset. This
allows wq type to be changed after disable to be re-enabled.

Move the size and group association to its own cleanup and only call it
during device disable.

Fixes: 0dcfe41e9a4c ("dmanegine: idxd: cleanup all device related bits after disabling device")
Reported-by: Lucas Van <lucas.van@...el.com>
Tested-by: Lucas Van <lucas.van@...el.com>
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
Link: https://lore.kernel.org/r/163951291732.2987775.13576571320501115257.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dma/idxd/device.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -382,8 +382,6 @@ static void idxd_wq_disable_cleanup(stru
 	lockdep_assert_held(&wq->wq_lock);
 	memset(wq->wqcfg, 0, idxd->wqcfg_size);
 	wq->type = IDXD_WQT_NONE;
-	wq->size = 0;
-	wq->group = NULL;
 	wq->threshold = 0;
 	wq->priority = 0;
 	wq->ats_dis = 0;
@@ -392,6 +390,15 @@ static void idxd_wq_disable_cleanup(stru
 	memset(wq->name, 0, WQ_NAME_SIZE);
 }
 
+static void idxd_wq_device_reset_cleanup(struct idxd_wq *wq)
+{
+	lockdep_assert_held(&wq->wq_lock);
+
+	idxd_wq_disable_cleanup(wq);
+	wq->size = 0;
+	wq->group = NULL;
+}
+
 static void idxd_wq_ref_release(struct percpu_ref *ref)
 {
 	struct idxd_wq *wq = container_of(ref, struct idxd_wq, wq_active);
@@ -699,6 +706,7 @@ static void idxd_device_wqs_clear_state(
 
 		if (wq->state == IDXD_WQ_ENABLED) {
 			idxd_wq_disable_cleanup(wq);
+			idxd_wq_device_reset_cleanup(wq);
 			wq->state = IDXD_WQ_DISABLED;
 		}
 	}