linux-kernel - [PATCH AUTOSEL 5.8 48/64] drm/amd/powerplay: suppress compile error around BUG

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Date:   Mon, 10 Aug 2020 15:08:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.8 48/64] drm/amd/powerplay: suppress compile error around BUG_ON

From: Evan Quan <evan.quan@....com>

[ Upstream commit 75bc07e2403caea9ecac69f766dfb7dc33547594 ]

To suppress the compile error below for "ARCH=arc".
   drivers/gpu/drm/amd/amdgpu/../powerplay/arcturus_ppt.c: In function 'arcturus_fill_eeprom_i2c_req':
>> arch/arc/include/asm/bug.h:22:2: error: implicit declaration of function 'pr_warn'; did you mean 'pci_warn'? [-Werror=implicit-function-declaration]
      22 |  pr_warn("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
         |  ^~~~~~~
   include/asm-generic/bug.h:62:57: note: in expansion of macro 'BUG'
      62 | #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
         |                                                         ^~~
   drivers/gpu/drm/amd/amdgpu/../powerplay/arcturus_ppt.c:2157:2: note: in expansion of macro 'BUG_ON'
    2157 |  BUG_ON(numbytes > MAX_SW_I2C_COMMANDS);

Signed-off-by: Evan Quan <evan.quan@....com>
Acked-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/powerplay/arcturus_ppt.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
index 27c5fc9572b27..e4630a76d7bf5 100644
--- a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
+++ b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
@@ -2042,8 +2042,6 @@ static void arcturus_fill_eeprom_i2c_req(SwI2cRequest_t  *req, bool write,
 {
 	int i;
 
-	BUG_ON(numbytes > MAX_SW_I2C_COMMANDS);
-
 	req->I2CcontrollerPort = 0;
 	req->I2CSpeed = 2;
 	req->SlaveAddress = address;
@@ -2081,6 +2079,12 @@ static int arcturus_i2c_eeprom_read_data(struct i2c_adapter *control,
 	struct smu_table_context *smu_table = &adev->smu.smu_table;
 	struct smu_table *table = &smu_table->driver_table;
 
+	if (numbytes > MAX_SW_I2C_COMMANDS) {
+		dev_err(adev->dev, "numbytes requested %d is over max allowed %d\n",
+			numbytes, MAX_SW_I2C_COMMANDS);
+		return -EINVAL;
+	}
+
 	memset(&req, 0, sizeof(req));
 	arcturus_fill_eeprom_i2c_req(&req, false, address, numbytes, data);
 
@@ -2117,6 +2121,12 @@ static int arcturus_i2c_eeprom_write_data(struct i2c_adapter *control,
 	SwI2cRequest_t req;
 	struct amdgpu_device *adev = to_amdgpu_device(control);
 
+	if (numbytes > MAX_SW_I2C_COMMANDS) {
+		dev_err(adev->dev, "numbytes requested %d is over max allowed %d\n",
+			numbytes, MAX_SW_I2C_COMMANDS);
+		return -EINVAL;
+	}
+
 	memset(&req, 0, sizeof(req));
 	arcturus_fill_eeprom_i2c_req(&req, true, address, numbytes, data);
 
-- 
2.25.1