Re: [Qemu-devel] [PATCH] scsi-generic: Simplify error handling code

[Paolo Bonzini <pbonzini@redhat.com>]

On 18/01/2018 03:52, Fam Zheng wrote:
> Coverity doesn't like the ignored return value introduced in
> 9d3b155186c278 (hw/block: Fix the return type), and other callers are
> converted already in ceff3e1f01.
> 
> This one was added lately in d9bcd6f7f23a and missed the train. Do it
> now.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  hw/scsi/scsi-generic.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
> index ba70c0dc19..7414fe2d67 100644
> --- a/hw/scsi/scsi-generic.c
> +++ b/hw/scsi/scsi-generic.c
> @@ -482,7 +482,6 @@ static void scsi_generic_realize(SCSIDevice *s, Error **errp)
>      int rc;
>      int sg_version;
>      struct sg_scsi_id scsiid;
> -    Error *local_err = NULL;
>  
>      if (!s->conf.blk) {
>          error_setg(errp, "drive property not set");
> @@ -516,11 +515,9 @@ static void scsi_generic_realize(SCSIDevice *s, Error **errp)
>          error_setg(errp, "SG_GET_SCSI_ID ioctl failed");
>          return;
>      }
> -    blkconf_apply_backend_options(&s->conf,
> -                                  blk_is_read_only(s->conf.blk),
> -                                  true, &local_err);
> -    if (local_err) {
> -        error_propagate(errp, local_err);
> +    if (!blkconf_apply_backend_options(&s->conf,
> +                                       blk_is_read_only(s->conf.blk),
> +                                       true, errp)) {
>          return;
>      }
>  
> 

I'm not a fan of bool return types, in general (because "!" is often
success while "< 0" is failure) and especially when there is an Error**;
I disagree with commit 9d3b155186.  But the function is not in an area I
maintain so I'm queuing this, thanks.

Paolo