linux-kernel - [PATCH 2/2] habanalabs: cast to u64 before shift

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Message-Id: <20200829102556.21895-2-oded.gabbay@gmail.com>
Date:   Sat, 29 Aug 2020 13:25:56 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org, SW_Drivers@...ana.ai
Subject: [PATCH 2/2] habanalabs: cast to u64 before shift > 31 bits

When shifting a boolean variable by more than 31 bits and putting the
result into a u64 variable, we need to cast the boolean into unsigned 64
bits to prevent possible overflow.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/gaudi/gaudi.c | 8 +++++---
 drivers/misc/habanalabs/goya/goya.c   | 8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 076a7697f85d..084019788e11 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -6114,7 +6114,7 @@ static bool gaudi_is_device_idle(struct hl_device *hdev, u64 *mask,
 		is_idle &= is_eng_idle;
 
 		if (mask)
-			*mask |= !is_eng_idle <<
+			*mask |= ((u64) !is_eng_idle) <<
 					(GAUDI_ENGINE_ID_DMA_0 + dma_id);
 		if (s)
 			seq_printf(s, fmt, dma_id,
@@ -6137,7 +6137,8 @@ static bool gaudi_is_device_idle(struct hl_device *hdev, u64 *mask,
 		is_idle &= is_eng_idle;
 
 		if (mask)
-			*mask |= !is_eng_idle << (GAUDI_ENGINE_ID_TPC_0 + i);
+			*mask |= ((u64) !is_eng_idle) <<
+						(GAUDI_ENGINE_ID_TPC_0 + i);
 		if (s)
 			seq_printf(s, fmt, i,
 				is_eng_idle ? "Y" : "N",
@@ -6165,7 +6166,8 @@ static bool gaudi_is_device_idle(struct hl_device *hdev, u64 *mask,
 		is_idle &= is_eng_idle;
 
 		if (mask)
-			*mask |= !is_eng_idle << (GAUDI_ENGINE_ID_MME_0 + i);
+			*mask |= ((u64) !is_eng_idle) <<
+						(GAUDI_ENGINE_ID_MME_0 + i);
 		if (s) {
 			if (!is_slave)
 				seq_printf(s, fmt, i,
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index c41f2917863b..88847eb1b472 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -5173,7 +5173,8 @@ static bool goya_is_device_idle(struct hl_device *hdev, u64 *mask,
 		is_idle &= is_eng_idle;
 
 		if (mask)
-			*mask |= !is_eng_idle << (GOYA_ENGINE_ID_DMA_0 + i);
+			*mask |= ((u64) !is_eng_idle) <<
+						(GOYA_ENGINE_ID_DMA_0 + i);
 		if (s)
 			seq_printf(s, dma_fmt, i, is_eng_idle ? "Y" : "N",
 					qm_glbl_sts0, dma_core_sts0);
@@ -5196,7 +5197,8 @@ static bool goya_is_device_idle(struct hl_device *hdev, u64 *mask,
 		is_idle &= is_eng_idle;
 
 		if (mask)
-			*mask |= !is_eng_idle << (GOYA_ENGINE_ID_TPC_0 + i);
+			*mask |= ((u64) !is_eng_idle) <<
+						(GOYA_ENGINE_ID_TPC_0 + i);
 		if (s)
 			seq_printf(s, fmt, i, is_eng_idle ? "Y" : "N",
 				qm_glbl_sts0, cmdq_glbl_sts0, tpc_cfg_sts);
@@ -5216,7 +5218,7 @@ static bool goya_is_device_idle(struct hl_device *hdev, u64 *mask,
 	is_idle &= is_eng_idle;
 
 	if (mask)
-		*mask |= !is_eng_idle << GOYA_ENGINE_ID_MME_0;
+		*mask |= ((u64) !is_eng_idle) << GOYA_ENGINE_ID_MME_0;
 	if (s) {
 		seq_printf(s, fmt, 0, is_eng_idle ? "Y" : "N", qm_glbl_sts0,
 				cmdq_glbl_sts0, mme_arch_sts);
-- 
2.17.1