Re: [patch 2.6.12-rc1-mm4] fork_connector: add a fork connector

[Evgeniy Polyakov <johnpol@2ka.mipt.ru>]

On Fri, 08 Apr 2005 15:08:13 -0700
Jay Lan <jlan@engr.sgi.com> wrote:

> Hi Evgeniy,
> 
> Forget about my previous request of a new patch.
> 
> The failures were straight forward enough to figure out.

Ok.
The latest sources are always awailable at
http://tservice.net.ru/~s0mbre/archive/connector

> - jay
> 
> Jay Lan wrote:
> > My workarea was based on 2.6.12-rc1-mm4 plus Guilluame's patch.
> > 
> > Your patch caused 5 out of 8 hunks failure at connector.c
> > and one failure at connector.h.
> > 
> > Could you generate a new patch based on my version? A tar
> > file of complete source of drivers/connector would work
> > also. :)
> > 
> > Thanks!
> >  - jay
> > 
> > Evgeniy Polyakov wrote:
> > 
> >> Could you give attached patch a try instead of previous one.
> >> It adds gfp mask into cn_netlink_send() call also.
> >> If you need updated CBUS sources, feel free to ask, I will send 
> >> updated sources with Andrew's comments resolved too.
> >>
> >> I do not know exactly your connector version, so patch will probably 
> >> be applied with fuzz.
> >>
> >> feel free to contact if it does not apply, I will send
> >> the whole sources.
> >>
> >> Thank you.
> >>
> >> * looking for johnpol@2ka.mipt.ru-2004/connector--main--0--patch-38 to 
> >> compare with
> >> * comparing to johnpol@2ka.mipt.ru-2004/connector--main--0--patch-38
> >> M  connector.c
> >> M  connector.h
> >> M  cbus.c
> >>
> >> * modified files
> >>
> >> --- orig/drivers/connector/connector.c
> >> +++ mod/drivers/connector/connector.c
> >> @@ -70,7 +70,7 @@
> >>   * then it is new message.
> >>   *
> >>   */
> >> -void cn_netlink_send(struct cn_msg *msg, u32 __groups)
> >> +void cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask)
> >>  {
> >>      struct cn_callback_entry *n, *__cbq;
> >>      unsigned int size;
> >> @@ -102,7 +102,7 @@
> >>  
> >>      size = NLMSG_SPACE(sizeof(*msg) + msg->len);
> >>  
> >> -    skb = alloc_skb(size, GFP_ATOMIC);
> >> +    skb = alloc_skb(size, gfp_mask);
> >>      if (!skb) {
> >>          printk(KERN_ERR "Failed to allocate new skb with size=%u.\n", 
> >> size);
> >>          return;
> >> @@ -119,11 +119,11 @@
> >>  #endif
> >>     
> >>      NETLINK_CB(skb).dst_groups = groups;
> >> -
> >> -    uskb = skb_clone(skb, GFP_ATOMIC);
> >> -    if (uskb)
> >> +#if 0
> >> +    uskb = skb_clone(skb, gfp_mask);
> >> +    if (uskb && 0)
> >>          netlink_unicast(dev->nls, uskb, 0, 0);
> >> -   
> >> +#endif   
> >>      netlink_broadcast(dev->nls, skb, 0, groups, GFP_ATOMIC);
> >>  
> >>      return;
> >> @@ -158,7 +158,7 @@
> >>      }
> >>      spin_unlock_bh(&dev->cbdev->queue_lock);
> >>  
> >> -    return found;
> >> +    return (found)?0:-ENODEV;
> >>  }
> >>  
> >>  /*
> >> @@ -181,7 +181,6 @@
> >>                  "requested msg->len=%u[%u], nlh->nlmsg_len=%u, 
> >> skb->len=%u.\n",
> >>                  msg->len, NLMSG_SPACE(msg->len + sizeof(*msg)),
> >>                  nlh->nlmsg_len, skb->len);
> >> -        kfree_skb(skb);
> >>          return -EINVAL;
> >>      }
> >>  #if 0
> >> @@ -215,17 +214,18 @@
> >>             skb->len, skb->data_len, skb->truesize, skb->protocol,
> >>             skb_cloned(skb), skb_shared(skb));
> >>  #endif
> >> -    while (skb->len >= NLMSG_SPACE(0)) {
> >> +    if (skb->len >= NLMSG_SPACE(0)) {
> >>          nlh = (struct nlmsghdr *)skb->data;
> >> +
> >>          if (nlh->nlmsg_len < sizeof(struct cn_msg) ||
> >>              skb->len < nlh->nlmsg_len ||
> >>              nlh->nlmsg_len > CONNECTOR_MAX_MSG_SIZE) {
> >> -#if 0
> >> +#if 1
> >>              printk(KERN_INFO "nlmsg_len=%u, sizeof(*nlh)=%u\n",
> >>                     nlh->nlmsg_len, sizeof(*nlh));
> >>  #endif
> >>              kfree_skb(skb);
> >> -            break;
> >> +            goto out;
> >>          }
> >>  
> >>          len = NLMSG_ALIGN(nlh->nlmsg_len);
> >> @@ -233,22 +233,11 @@
> >>              len = skb->len;
> >>  
> >>          err = __cn_rx_skb(skb, nlh);
> >> -        if (err) {
> >> -#if 0
> >> -            if (err < 0 && (nlh->nlmsg_flags & NLM_F_ACK))
> >> -                netlink_ack(skb, nlh, -err);
> >> -#endif
> >> -            break;
> >> -        } else {
> >> -#if 0
> >> -            if (nlh->nlmsg_flags & NLM_F_ACK)
> >> -                netlink_ack(skb, nlh, 0);
> >> -#endif
> >> -            break;
> >> -        }
> >> -        skb_pull(skb, len);
> >> +        if (err < 0)
> >> +            kfree_skb(skb);
> >>      }
> >> -           
> >> +
> >> +out:
> >>      kfree_skb(__skb);
> >>  }
> >>  
> >> @@ -310,7 +299,7 @@
> >>              m.ack = notify_event;
> >>  
> >>              memcpy(&m.id, id, sizeof(m.id));
> >> -            cn_netlink_send(&m, ctl->group);
> >> +            cn_netlink_send(&m, ctl->group, GFP_ATOMIC);
> >>          }
> >>      }
> >>      spin_unlock_bh(&notify_lock);
> >>
> >>
> >> --- orig/include/linux/connector.h
> >> +++ mod/include/linux/connector.h
> >> @@ -148,7 +148,7 @@
> >>  
> >>  int cn_add_callback(struct cb_id *, char *, void (* callback)(void *));
> >>  void cn_del_callback(struct cb_id *);
> >> -void cn_netlink_send(struct cn_msg *, u32);
> >> +void cn_netlink_send(struct cn_msg *, u32, int);
> >>  
> >>  int cn_queue_add_callback(struct cn_queue_dev *dev, struct 
> >> cn_callback *cb);
> >>  void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
> >>
> >>
> >>
> >>
> >>
> > 


	Evgeniy Polyakov

Only failure makes us experts. -- Theo de Raadt