linux-kernel - [PATCH] staging: gpib: Remove a dead condition in if statement

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Message-ID: <20241015200655.17444-1-everestkc@everestkc.com.np>
Date: Tue, 15 Oct 2024 14:06:47 -0600
From: "Everest K.C." <everestkc@...restkc.com.np>
To: dpenkler@...il.com,
	gregkh@...uxfoundation.org
Cc: "Everest K.C." <everestkc@...restkc.com.np>,
	skhan@...uxfoundation.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] staging: gpib: Remove a dead condition in if statement

The variable `residue` is an unsigned int, also the function
`fluke_get_dma_residue` returns an unsigned int. The value of
an unsigned int can only be 0 at minimum.
The less-than-zero comparision can never be true.
Fix it by removing the dead condition in the if statement.

This issue was reported by Coverity Scan.
Report:
CID 1600782: (#1 of 1): Macro compares unsigned to 0 (NO_EFFECT)
unsigned_compare: This less-than-zero comparison of an unsigned value
is never true. residue < 0U.

Fixes: 55936779f496 ("staging: gpib: Add Fluke cda based cards GPIB driver")
Signed-off-by: Everest K.C. <everestkc@...restkc.com.np>
---
 drivers/staging/gpib/eastwood/fluke_gpib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/gpib/eastwood/fluke_gpib.c b/drivers/staging/gpib/eastwood/fluke_gpib.c
index f9f149db222d..51b4f9891a34 100644
--- a/drivers/staging/gpib/eastwood/fluke_gpib.c
+++ b/drivers/staging/gpib/eastwood/fluke_gpib.c
@@ -644,7 +644,7 @@ static int fluke_dma_read(gpib_board_t *board, uint8_t *buffer,
 	 */
 	usleep_range(10, 15);
 	residue = fluke_get_dma_residue(e_priv->dma_channel, dma_cookie);
-	if (WARN_ON_ONCE(residue > length || residue < 0))
+	if (WARN_ON_ONCE(residue > length))
 		return -EFAULT;
 	*bytes_read += length - residue;
 	dmaengine_terminate_all(e_priv->dma_channel);
-- 
2.43.0