linux-kernel - [PATCH 1/2] habanalabs: abort reset on invalid request

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Date:   Tue, 16 Nov 2021 16:24:35 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] habanalabs: abort reset on invalid request

Hard-reset is mutually exclusive with reset-on-device-release.
Therefore, if such a request arrives to the reset function, abort
the reset and return an error to the callee.

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index ca74d7815a67..a3d5617da64c 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
 /*
- * Copyright 2016-2019 HabanaLabs, Ltd.
+ * Copyright 2016-2021 HabanaLabs, Ltd.
  * All Rights Reserved.
  */
 
@@ -1020,8 +1020,8 @@ static void handle_reset_trigger(struct hl_device *hdev, u32 flags)
  */
 int hl_device_reset(struct hl_device *hdev, u32 flags)
 {
-	u64 idle_mask[HL_BUSY_ENGINES_MASK_EXT_SIZE] = {0};
 	bool hard_reset, from_hard_reset_thread, fw_reset, hard_instead_soft = false;
+	u64 idle_mask[HL_BUSY_ENGINES_MASK_EXT_SIZE] = {0};
 	int i, rc;
 
 	if (!hdev->init_done) {
@@ -1039,11 +1039,13 @@ int hl_device_reset(struct hl_device *hdev, u32 flags)
 		hard_reset = true;
 	}
 
-	if (hdev->reset_upon_device_release &&
-			(flags & HL_DRV_RESET_DEV_RELEASE)) {
-		dev_dbg(hdev->dev,
-			"Perform %s-reset upon device release\n",
-			hard_reset ? "hard" : "soft");
+	if (hdev->reset_upon_device_release && (flags & HL_DRV_RESET_DEV_RELEASE)) {
+		if (hard_reset) {
+			dev_crit(hdev->dev,
+				"Aborting reset because hard-reset is mutually exclusive with reset-on-device-release\n");
+			return -EINVAL;
+		}
+
 		goto do_reset;
 	}
 
-- 
2.25.1