linux-kernel - Re: [PATCH] usb: class: usblp: Fixed assignments inside if conditions

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Date:   Tue, 16 May 2017 13:44:47 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Alberto Ladron <alberto.ladron@...il.com>
Cc:     kbuild-all@...org, zaitcev@...hat.com, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alberto Ladron <alberto.ladron@...il.com>
Subject: Re: [PATCH] usb: class: usblp: Fixed assignments inside if conditions

Hi Alberto,

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on v4.12-rc1 next-20170515]
[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/Alberto-Ladron/usb-class-usblp-Fixed-assignments-inside-if-conditions/20170513-140010
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: x86_64-rhel (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers//usb/class/usblp.c: In function 'usblp_submit_read':
>> drivers//usb/class/usblp.c:1021:6: error: 'rv' undeclared (first use in this function)
     if (rv < 0) {
         ^~
   drivers//usb/class/usblp.c:1021:6: note: each undeclared identifier is reported only once for each function it appears in

vim +/rv +1021 drivers//usb/class/usblp.c

  1005		urb = usb_alloc_urb(0, GFP_KERNEL);
  1006		if (urb == NULL)
  1007			goto raise_urb;
  1008	
  1009		usb_fill_bulk_urb(urb, usblp->dev,
  1010			usb_rcvbulkpipe(usblp->dev,
  1011			  usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
  1012			usblp->readbuf, USBLP_BUF_SIZE_IN,
  1013			usblp_bulk_read, usblp);
  1014		usb_anchor_urb(urb, &usblp->urbs);
  1015	
  1016		spin_lock_irqsave(&usblp->lock, flags);
  1017		usblp->readcount = 0; /* XXX Why here? */
  1018		usblp->rcomplete = 0;
  1019		spin_unlock_irqrestore(&usblp->lock, flags);
  1020		rc = usb_submit_urb(urb, GFP_KERNEL);
> 1021		if (rv < 0) {
  1022			dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
  1023			spin_lock_irqsave(&usblp->lock, flags);
  1024			usblp->rstatus = rc;
  1025			usblp->rcomplete = 1;
  1026			spin_unlock_irqrestore(&usblp->lock, flags);
  1027			goto raise_submit;
  1028		}
  1029	

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