linux-kernel - Re: [PATCH v2] xen/scsiback: add error handling for xenbus

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Date:   Sat, 16 Jun 2018 03:22:27 +0800
From:   kbuild test robot <lkp@...el.com>
To:     linux-kernel-owner@...r.kernel.org
Cc:     kbuild-all@...org, Zhouyang Jia <jiazhouyang09@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] xen/scsiback: add error handling for xenbus_printf

Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on v4.17 next-20180615]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/linux-kernel-owner-vger-kernel-org/xen-scsiback-add-error-handling-for-xenbus_printf/20180616-011349
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: i386-randconfig-x009-201823 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers//xen/xen-scsiback.c: In function 'scsiback_do_add_lun':
>> drivers//xen/xen-scsiback.c:1032:32: error: 'err' undeclared (first use in this function)
       xenbus_dev_error(info->dev, err,
                                   ^~~
   drivers//xen/xen-scsiback.c:1032:32: note: each undeclared identifier is reported only once for each function it appears in

vim +/err +1032 drivers//xen/xen-scsiback.c

  1009	
  1010	static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
  1011					char *phy, struct ids_tuple *vir, int try)
  1012	{
  1013		struct v2p_entry *entry;
  1014		unsigned long flags;
  1015	
  1016		if (try) {
  1017			spin_lock_irqsave(&info->v2p_lock, flags);
  1018			entry = scsiback_chk_translation_entry(info, vir);
  1019			spin_unlock_irqrestore(&info->v2p_lock, flags);
  1020			if (entry)
  1021				return;
  1022		}
  1023		if (!scsiback_add_translation_entry(info, phy, vir)) {
  1024			if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
  1025					  "%d", XenbusStateInitialised)) {
  1026				pr_err("xenbus_printf error %s\n", state);
  1027				scsiback_del_translation_entry(info, vir);
  1028			}
  1029		} else if (!try) {
  1030			if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
  1031				      "%d", XenbusStateClosed))
> 1032				xenbus_dev_error(info->dev, err,
  1033					"%s: writing %s", __func__, state);
  1034		}
  1035	}
  1036	

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