Re: [Qemu-devel] [PATCH v5 1/4] net/rocker: Remove the dead error handling

[Markus Armbruster <armbru@redhat.com>]

Mao Zhongyi <maozy.fnst@cn.fujitsu.com> writes:

> Memory allocation functions like world_alloc, desc_ring_alloc etc,
> they are all wrappers around g_malloc, g_new etc. But g_malloc and 
> similar functions doesn't return null. Because they ignore the fact 

don't

> that g_malloc() of 0 bytes returns null. So error checks for these
> allocation failure are superfluous. Now, remove them entirely.
>
> Signed-off-by: Mao Zhongyi <maozy.fnst@cn.fujitsu.com>

Reviewed-by: Markus Armbruster <armbru@redhat.com>

There's one more cleanup opportunity:

> diff --git a/hw/net/rocker/rocker_desc.c b/hw/net/rocker/rocker_desc.c
> index ac02797..d0df89a 100644
> --- a/hw/net/rocker/rocker_desc.c
> +++ b/hw/net/rocker/rocker_desc.c
> @@ -65,10 +65,6 @@ char *desc_get_buf(DescInfo *info, bool read_only)
>          info->buf_size = size;
>      }
>  
> -    if (!info->buf) {
> -        return NULL;
> -    }
> -
>      if (pci_dma_read(dev, le64_to_cpu(info->desc.buf_addr), info->buf, size)) {
>          return NULL;
>      }

None of the pci_dma_read() calls outside rocker check the return value.
Just as well, because it always returns 0.  Please clean this up in a
separate followup patch.

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