[Intel-gfx] [PATCH CI] drm/i915: Initialize err in remap_io_sg()

[Souza, Jose]

Rodrigo, Jani: So "i915: fix remap_io_sg to verify the pgprot" was not merged into any drm-intel branch, how should I merge this after get CI green
light?

On Mon, 2021-05-17 at 13:21 -0700, José Roberto de Souza wrote:
> If the do while loop breaks in 'if (!sg_dma_len(sgl))' in the first
> iteration, err is uninitialized causing a wrong call to zap_vma_ptes().
> 
> But that is impossible to happen as a scatterlist must have at least
> one valid segment.
> Anyways to avoid more reports from static checkers initializing ret
> here.
> 
> Fixes: b12d691ea5e0 ("i915: fix remap_io_sg to verify the pgprot")
> Reviewed-by: Christoph Hellwig <hch at lst.de>
> Cc: Christoph Hellwig <hch at lst.de>
> Signed-off-by: James Ausmus <james.ausmus at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_mm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c
> index 4c8cd08c672d..25576fa73ff0 100644
> --- a/drivers/gpu/drm/i915/i915_mm.c
> +++ b/drivers/gpu/drm/i915/i915_mm.c
> @@ -47,7 +47,7 @@ int remap_io_sg(struct vm_area_struct *vma,
>  		struct scatterlist *sgl, resource_size_t iobase)
>  {
>  	unsigned long pfn, len, remapped = 0;
> -	int err;
> +	int err = 0;
>  
>  	/* We rely on prevalidation of the io-mapping to skip track_pfn(). */
>  	GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS);