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49 lines
1.8 KiB
Diff
49 lines
1.8 KiB
Diff
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From 49036d4ab54259a8fa8c1511a7024ed95d68037d Mon Sep 17 00:00:00 2001
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From: Nathan Chancellor <nathan@kernel.org>
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Date: Mon, 31 Jan 2022 17:50:43 -0700
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Subject: [PATCH] media: i2c: ov9281: Initialize id_msb to zero in
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ov9281_check_sensor_id()
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Clang warns:
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drivers/media/i2c/ov9281.c:1132:6: warning: variable 'id_msb' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
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if (!ret)
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^~~~
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drivers/media/i2c/ov9281.c:1135:9: note: uninitialized use occurs here
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id |= (id_msb << 8);
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^~~~~~
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drivers/media/i2c/ov9281.c:1132:2: note: remove the 'if' if its condition is always true
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if (!ret)
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^~~~~~~~~
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drivers/media/i2c/ov9281.c:1127:20: note: initialize the variable 'id_msb' to silence this warning
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u32 id = 0, id_msb;
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^
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= 0
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1 warning generated.
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If the first ov9281_read_reg() call fails, id_msb will be used
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uninitialized. However, this warning does not actually matter in
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practice because the value of id is not used when either call to
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ov9281_read_reg() fails, as the boolean OR will short circuit due to the
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ret condition being checked first. Regardless, it is not good to use
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variables uninitialized so silence the warning by initializing id_msb to
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0, as was done with id.
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Fixes: 20855581e0eb ("media: i2c: ov9281: Read chip ID via 2 reads")
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Signed-off-by: Nathan Chancellor <nathan@kernel.org>
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---
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drivers/media/i2c/ov9281.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/media/i2c/ov9281.c
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+++ b/drivers/media/i2c/ov9281.c
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@@ -1124,7 +1124,7 @@ static int ov9281_check_sensor_id(struct
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struct i2c_client *client)
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{
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struct device *dev = &ov9281->client->dev;
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- u32 id = 0, id_msb;
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+ u32 id = 0, id_msb = 0;
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int ret;
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ret = ov9281_read_reg(client, OV9281_REG_CHIP_ID + 1,
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