linux-kernel - [PATCH 1/3] habanalabs: skip reading f/w errors on bad status

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Message-Id: <20210417092052.22842-1-ogabbay@kernel.org>
Date:   Sat, 17 Apr 2021 12:20:50 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] habanalabs: skip reading f/w errors on bad status

If we read all FF from the boot status register, then something is
totally wrong and there is no point of reading specific errors.

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/firmware_if.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/common/firmware_if.c b/drivers/misc/habanalabs/common/firmware_if.c
index 7cf82da67dab..fff29f057b6d 100644
--- a/drivers/misc/habanalabs/common/firmware_if.c
+++ b/drivers/misc/habanalabs/common/firmware_if.c
@@ -850,8 +850,13 @@ int hl_fw_read_preboot_status(struct hl_device *hdev, u32 cpu_boot_status_reg,
 	if (rc) {
 		dev_err(hdev->dev, "Failed to read preboot version\n");
 		detect_cpu_boot_status(hdev, status);
-		fw_read_errors(hdev, boot_err0_reg,
-				cpu_security_boot_status_reg);
+
+		/* If we read all FF, then something is totally wrong, no point
+		 * of reading specific errors
+		 */
+		if (status != -1)
+			fw_read_errors(hdev, boot_err0_reg,
+					cpu_security_boot_status_reg);
 		return -EIO;
 	}
 
-- 
2.25.1