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SubjectRe: [PATCH -tip][SCSI] scsi: scsi_transport_iscsi.c initialize the variable before it get used
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On Tue, 2009-05-26 at 16:06 +0000, James Bottomley wrote:
> On Tue, 2009-05-26 at 21:30 +0530, Jaswinder Singh Rajput wrote:
> > Hello James,
> > On Tue, 2009-05-26 at 10:28 -0500, James Bottomley wrote:
> > > On Tue, 2009-05-26 at 20:49 +0530, Jaswinder Singh Rajput wrote:
> > > > I am watching this problem from long time in -tip.
> > > >
> > > > Subject: [PATCH] scsi: scsi_transport_iscsi.c initialize the variable before it get used
> > > >
> > > > In some cases, err will be used uninitialized.
> > >
> > > What cases? A simple theoretical analysis shows that this variable is
> > > always set.
> > >
> >
> > Ok lets takes your tree:
> >
> > http://git.kernel.org/?p=linux/kernel/git/jejb/scsi-misc-2.6.git;a=blob;f=drivers/scsi/scsi_transport_iscsi.c;hb=10eb0f013c63c71c82ede77945a5f390c10cfda6
> >
> >
> > 672 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
> > 673 {
> > 674 struct Scsi_Host *shost = iscsi_session_to_shost(session);
> > 675 struct iscsi_cls_host *ihost;
> > 676 unsigned long flags;
> > 677 unsigned int id = target_id;
> > 678 int err;
> > 679
> > 680 ihost = shost->shost_data;
> > 681 session->sid = atomic_add_return(1, &iscsi_session_nr);
> > 682
> > 683 if (id == ISCSI_MAX_TARGET) {
> > 684 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
> > 685 err = device_for_each_child(&shost->shost_gendev, &id,
> > 686 iscsi_get_next_target_id);
> > 687 if (!err)
> > 688 break;
> > 689 }
> > 690
> > 691 if (id == ISCSI_MAX_TARGET) {
> > 692 iscsi_cls_session_printk(KERN_ERR, session,
> > 693 "Too many iscsi targets. Max "
> > 694 "number of targets is %d.\n",
> > 695 ISCSI_MAX_TARGET - 1);
> > 696 goto release_host;
> > 697 }
> > 698 }
> > 699 session->target_id = id;
> > 700
> > 701 dev_set_name(&session->dev, "session%u", session->sid);
> > 702 err = device_add(&session->dev);
> > 703 if (err) {
> > 704 iscsi_cls_session_printk(KERN_ERR, session,
> > 705 "could not register session's dev\n");
> > 706 goto release_host;
> > 707 }
> > 708 transport_register_device(&session->dev);
> > 709
> > 710 spin_lock_irqsave(&sesslock, flags);
> > 711 list_add(&session->sess_list, &sesslist);
> > 712 spin_unlock_irqrestore(&sesslock, flags);
> > 713
> > 714 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
> > 715 return 0;
> > 716
> > 717 release_host:
> > 718 scsi_host_put(shost);
> > 719 return err;
> > 720 }
> >
> > You are right but compiler is confused and giving warning like this :
> >
> > 1. do not go inside :
> > 684 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
>
> How? id is an unsigned int and ISCSI_MAX_TARGET is defined to be -1 in
> include/scsi/scsi_transport_iscsi.h (might be better if it were
> UINT_MAX, but -1 is just as good).
>

Yes, you are right, I was telling you how compiler was confused in 4.3.2
but I am glad to hear that this problem is fixed in 4.3.3 as you told
me :-)

So now its upto you. 4.3.2 is not soo old, So either initialize the
variable or stay with stray warning in the kernel ;-)

Thanks,
--
JSR



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