linux-kernel - [PATCH] spi: initialize status to success

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Date:   Sat, 16 Apr 2022 16:51:32 -0400
From:   Tom Rix <trix@...hat.com>
To:     broonie@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com,
        paul.kocialkowski@...tlin.com
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] spi: initialize status to success

Clang static analysis reports this issue
spi.c:3583:2: warning: 2nd function call argument
  is an uninitialized value
  trace_spi_setup(spi, status);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

It is possible that status is never set because
its function level setting was removed by the
commit listed in the Fixes: tag.

Assume that setting 8 bits-per-word is ok and
initialize the status to 0.

Fixes: b3fe2e516741 ("spi: core: Only check bits_per_word validity when explicitly provided")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/spi/spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 563a56ce34a0..890ff46c784a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3475,7 +3475,7 @@ static int __spi_validate_bits_per_word(struct spi_controller *ctlr,
 int spi_setup(struct spi_device *spi)
 {
 	unsigned	bad_bits, ugly_bits;
-	int		status;
+	int		status = 0;
 
 	/*
 	 * Check mode to prevent that any two of DUAL, QUAD and NO_MOSI/MISO
-- 
2.27.0