Re: [PATCH] sound: fix uninit-value in i2s_dma_isr

[Mark Brown]

On Wed, Oct 30, 2024 at 10:38:29PM +0530, Suraj Sonawane wrote:
> Fix an issue detected by the Smatch tool:
> 
> sound/soc/bcm/bcm63xx-pcm-whistler.c:264 i2s_dma_isr()
> error: uninitialized symbol 'val_1'.
> sound/soc/bcm/bcm63xx-pcm-whistler.c:264 i2s_dma_isr()
> error: uninitialized symbol 'val_2'.
> 
> These errors occurred because the variables 'val_1' and 'val_2' are
> declared but may not be assigned a value before they are used.
> Specifically, if the loop that assigns values to 'val_1' and 'val_2'
> does not execute (for example, when 'offlevel' is zero), these
> variables remain uninitialized, leading to potential undefined
> behavior.
> 
> To resolve this issue, initialize 'val_1' and 'val_2' to 0 at the
> point of declaration. This ensures that 'val_1' and 'val_2' have
> defined values before they are used in subsequent calculations,
> preventing any warnings or undefined behavior in cases where the
> loop does not run.

This will shut the warning up, but why are these values valid?  Are we
handling the cases where the loops do not execute properly?

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