linux-kernel - [PATCH 06/20] misc: habanalabs: goya: Omit pointless check ensuring addr is >=0

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Message-Id: <20200629140442.1043957-7-lee.jones@linaro.org>
Date:   Mon, 29 Jun 2020 15:04:28 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     arnd@...db.de, gregkh@...uxfoundation.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Tomer Tayar <ttayar@...ana.ai>
Subject: [PATCH 06/20] misc: habanalabs: goya: Omit pointless check ensuring addr is >=0

Seeing as 'addr' is unsigned, it would be impossible for the assigned
value to be anything other than zero or positive.

Squashes the following W=1 warnings:

 drivers/misc/habanalabs/goya/goya.c: In function ‘goya_debugfs_read32’:
 drivers/misc/habanalabs/goya/goya.c:3945:19: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
 3945 | } else if ((addr >= DRAM_PHYS_BASE) &&
 | ^~
 drivers/misc/habanalabs/goya/goya.c: In function ‘goya_debugfs_write32’:
 drivers/misc/habanalabs/goya/goya.c:4002:19: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
 4002 | } else if ((addr >= DRAM_PHYS_BASE) &&
 | ^~
 drivers/misc/habanalabs/goya/goya.c: In function ‘goya_debugfs_read64’:
 drivers/misc/habanalabs/goya/goya.c:4047:19: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
 4047 | } else if ((addr >= DRAM_PHYS_BASE) &&
 | ^~
 drivers/misc/habanalabs/goya/goya.c: In function ‘goya_debugfs_write64’:
 drivers/misc/habanalabs/goya/goya.c:4091:19: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
 4091 | } else if ((addr >= DRAM_PHYS_BASE) &&
 | ^~
 drivers/misc/habanalabs/pci.c:328: warning: Excess function parameter 'dma_mask' description in 'hl_pci_set_dma_mask'
 drivers/misc/habanalabs/goya/goya_coresight.c: In function ‘goya_debug_coresight’:
 drivers/misc/habanalabs/goya/goya_coresight.c:643:6: warning: variable ‘val’ set but not used [-Wunused-but-set-variable]
 643 | u32 val;
 | ^~~

Cc: Oded Gabbay <oded.gabbay@...il.com>
Cc: Tomer Tayar <ttayar@...ana.ai>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/misc/habanalabs/goya/goya.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 0d2952bb58dfb..a4a20e27ed3b4 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -3942,8 +3942,7 @@ static int goya_debugfs_read32(struct hl_device *hdev, u64 addr, u32 *val)
 		*val = readl(hdev->pcie_bar[SRAM_CFG_BAR_ID] +
 				(addr - SRAM_BASE_ADDR));
 
-	} else if ((addr >= DRAM_PHYS_BASE) &&
-			(addr < DRAM_PHYS_BASE + hdev->asic_prop.dram_size)) {
+	} else if (addr < DRAM_PHYS_BASE + hdev->asic_prop.dram_size) {
 
 		u64 bar_base_addr = DRAM_PHYS_BASE +
 				(addr & ~(prop->dram_pci_bar_size - 0x1ull));
@@ -3999,8 +3998,7 @@ static int goya_debugfs_write32(struct hl_device *hdev, u64 addr, u32 val)
 		writel(val, hdev->pcie_bar[SRAM_CFG_BAR_ID] +
 					(addr - SRAM_BASE_ADDR));
 
-	} else if ((addr >= DRAM_PHYS_BASE) &&
-			(addr < DRAM_PHYS_BASE + hdev->asic_prop.dram_size)) {
+	} else if (addr < DRAM_PHYS_BASE + hdev->asic_prop.dram_size) {
 
 		u64 bar_base_addr = DRAM_PHYS_BASE +
 				(addr & ~(prop->dram_pci_bar_size - 0x1ull));
@@ -4044,9 +4042,8 @@ static int goya_debugfs_read64(struct hl_device *hdev, u64 addr, u64 *val)
 		*val = readq(hdev->pcie_bar[SRAM_CFG_BAR_ID] +
 				(addr - SRAM_BASE_ADDR));
 
-	} else if ((addr >= DRAM_PHYS_BASE) &&
-		   (addr <=
-		    DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64))) {
+	} else if (addr <=
+		   DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64)) {
 
 		u64 bar_base_addr = DRAM_PHYS_BASE +
 				(addr & ~(prop->dram_pci_bar_size - 0x1ull));
@@ -4088,9 +4085,8 @@ static int goya_debugfs_write64(struct hl_device *hdev, u64 addr, u64 val)
 		writeq(val, hdev->pcie_bar[SRAM_CFG_BAR_ID] +
 					(addr - SRAM_BASE_ADDR));
 
-	} else if ((addr >= DRAM_PHYS_BASE) &&
-		   (addr <=
-		    DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64))) {
+	} else if (addr <=
+		   DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64)) {
 
 		u64 bar_base_addr = DRAM_PHYS_BASE +
 				(addr & ~(prop->dram_pci_bar_size - 0x1ull));
-- 
2.25.1