linux-kernel - [PATCH 20/30] habanalabs: avoid copying pll data if pll_info

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Date:   Sat, 22 Jan 2022 21:57:21 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Tomer Tayar <ttayar@...ana.ai>
Subject: [PATCH 20/30] habanalabs: avoid copying pll data if pll_info_get fails

From: Tomer Tayar <ttayar@...ana.ai>

If reading PLL info from F/W fails, the PLL info is not set in the
"result" variable, and hence shouldn't be copied to the caller's array.

Signed-off-by: Tomer Tayar <ttayar@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/firmware_if.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/common/firmware_if.c b/drivers/misc/habanalabs/common/firmware_if.c
index 93e9045461ae..7f76f98154f0 100644
--- a/drivers/misc/habanalabs/common/firmware_if.c
+++ b/drivers/misc/habanalabs/common/firmware_if.c
@@ -958,15 +958,17 @@ int hl_fw_cpucp_pll_info_get(struct hl_device *hdev, u32 pll_index,
 
 	rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt),
 			HL_CPUCP_INFO_TIMEOUT_USEC, &result);
-	if (rc)
+	if (rc) {
 		dev_err(hdev->dev, "Failed to read PLL info, error %d\n", rc);
+		return rc;
+	}
 
 	pll_freq_arr[0] = FIELD_GET(CPUCP_PKT_RES_PLL_OUT0_MASK, result);
 	pll_freq_arr[1] = FIELD_GET(CPUCP_PKT_RES_PLL_OUT1_MASK, result);
 	pll_freq_arr[2] = FIELD_GET(CPUCP_PKT_RES_PLL_OUT2_MASK, result);
 	pll_freq_arr[3] = FIELD_GET(CPUCP_PKT_RES_PLL_OUT3_MASK, result);
 
-	return rc;
+	return 0;
 }
 
 int hl_fw_cpucp_power_get(struct hl_device *hdev, u64 *power)
-- 
2.25.1