On Tue, 19 Feb 2008, James Bottomley wrote:
> On Tue, 2008-02-19 at 21:29 +0200, Adrian Bunk wrote:
> > This patch removes dead code spotted by the Coverity checker.
> >
> > Signed-off-by: Adrian Bunk <[EMAIL PROTECTED]>
> >
> > ---
> >
> > drivers/scsi/qla4xxx/ql4_isr.c | 18 +-----------------
> > 1 file changed, 1 insertion(+), 17 deletions(-)
> >
> > --- linux-2.6/drivers/scsi/qla4xxx/ql4_isr.c.old 2008-02-19
> > 20:29:16.000000000 +0200
> > +++ linux-2.6/drivers/scsi/qla4xxx/ql4_isr.c 2008-02-19
> > 20:30:37.000000000 +0200
> > @@ -91,38 +91,22 @@ static void qla4xxx_status_entry(struct
> > if (scsi_status == 0) {
> > cmd->result = DID_OK << 16;
> > break;
> > }
> >
> > if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
> > cmd->result = DID_ERROR << 16;
> > break;
> > }
> >
> > - if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
> > + if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER)
> > scsi_set_resid(cmd, residual);
> > - if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
> > - cmd->underflow)) {
> > -
> > - cmd->result = DID_ERROR << 16;
> > -
> > - DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
> > - "Mid-layer Data underrun0, "
> > - "xferlen = 0x%x, "
> > - "residual = 0x%x\n", ha->host_no,
> > - cmd->device->channel,
> > - cmd->device->id,
> > - cmd->device->lun, __func__,
> > - scsi_bufflen(cmd), residual));
> > - break;
> > - }
> > - }
>
> This code doesn't look dead to me, it looks to be enforcing
> cmd->underrun if set ... what makes the coverity checker think it can
> never be executed?
Hmm, guess it's the earlier 'if (scsi_status == 0)' check a few lines
up... Dave S., can you take a look at this... Thanks, av
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