From 098c9db4767095a20ae3ab78a186eb1ae097a5c1 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Wed, 3 Jun 2020 13:28:45 -0700
Subject: [PATCH] spi: davinci: Remove uninitialized_var() usage
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Git-commit: 098c9db4767095a20ae3ab78a186eb1ae097a5c1
Patch-mainline: v5.9-rc1
References: git-fixes
Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings (e.g.
"unused variable"). If the compiler thinks it is uninitialized, either
simply initialize the variable or make compiler changes. As a precursor
to removing[2] this[3] macro[4], just remove this variable since it was
actually unused:
Drivers/spi/spi-davinci.c: In function ‘davinci_spi_bufs’:
drivers/spi/spi-davinci.c:579:11: warning: unused variable ‘rx_buf_count’ [-Wunused-variable]
579 | unsigned rx_buf_count;
| ^~~~~~~~~~~~
[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/
Fixes: 048177ce3b39 ("spi: spi-davinci: convert to DMA engine API")
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/spi/spi-davinci.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index f71c497393a6..f50c0c79cbdf 100644
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -576,7 +576,6 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
u32 errors = 0;
struct davinci_spi_config *spicfg;
struct davinci_spi_platform_data *pdata;
- unsigned uninitialized_var(rx_buf_count);
dspi = spi_master_get_devdata(spi->master);
pdata = &dspi->pdata;
--
2.16.4