linux-kernel - [PATCH v2] spi: spi-mpc512x-psc: Fix an unsigned comparison that can never be negative

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Message-Id: <20230807144942.30317-1-coolrrsh@gmail.com>
Date:   Mon,  7 Aug 2023 20:19:41 +0530
From:   coolrrsh@...il.com
To:     broonie@...nel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        Rajeshwar R Shinde <coolrrsh@...il.com>
Subject: [PATCH v2] spi: spi-mpc512x-psc: Fix an unsigned comparison that can never be negative 

From: Rajeshwar R Shinde <coolrrsh@...il.com>

In struct mpc512x_psc_spi, the variable 'irq' is declared as an unsigned int.
The comparison of variable 'irq'  with signed int operand is incorrect. Also,
the return value from the call to platform_get_irq(pdev,0) is int and it is 
assigned to an unsigned int variable 'irq', thus redeclaring the type of 
variable 'irq' to signed int.

This fixes warning such as:
drivers/spi/spi-mpc512x-psc.c:493:5-13: 
WARNING: Unsigned expression compared with zero: mps -> irq < 0

Signed-off-by: Rajeshwar R Shinde <coolrrsh@...il.com>

---
v1->v2
changed the commit message

---
 drivers/spi/spi-mpc512x-psc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c
index 99aeef28a..5cecca1be 100644
--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -53,7 +53,7 @@ struct mpc512x_psc_spi {
 	int type;
 	void __iomem *psc;
 	struct mpc512x_psc_fifo __iomem *fifo;
-	unsigned int irq;
+	int irq;
 	u8 bits_per_word;
 	u32 mclk_rate;
 
-- 
2.25.1