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From: Dan Carpenter <dan.carpenter@oracle.com>
To: kbuild@lists.01.org, Mike Christie <michael.christie@oracle.com>,
	martin.petersen@oracle.com, linux-scsi@vger.kernel.org,
	target-devel@vger.kernel.org, mst@redhat.com,
	jasowang@redhat.com, pbonzini@redhat.com, stefanha@redhat.com,
	virtualization@lists.linux-foundation.org
Cc: lkp@intel.com, kbuild-all@lists.01.org
Subject: Re: [PATCH 3/8] vhost scsi: alloc cmds per vq instead of session
Date: Wed, 23 Sep 2020 10:53:06 +0300
Message-ID: <20200923075305.GH4282@kadam> (raw)
In-Reply-To: <1600712588-9514-4-git-send-email-michael.christie@oracle.com>


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Hi Mike,

url:    https://github.com/0day-ci/linux/commits/Mike-Christie/vhost-scsi-fixes-and-cleanups/20200922-031251
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: i386-randconfig-m021-20200923 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/vhost/scsi.c:606 vhost_scsi_get_cmd() error: uninitialized symbol 'cpu'.

# https://github.com/0day-ci/linux/commit/aef0e1e9298ab68f2d7bdf1afb9a376641b993d5
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Mike-Christie/vhost-scsi-fixes-and-cleanups/20200922-031251
git checkout aef0e1e9298ab68f2d7bdf1afb9a376641b993d5
vim +/cpu +606 drivers/vhost/scsi.c

1a1ff8256af679c8 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  572  static struct vhost_scsi_cmd *
aef0e1e9298ab68f drivers/vhost/scsi.c      Mike Christie      2020-09-21  573  vhost_scsi_get_cmd(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
95e7c4341b8e28da drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  574  		   unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
95e7c4341b8e28da drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  575  		   u32 exp_data_len, int data_direction)
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  576  {
aef0e1e9298ab68f drivers/vhost/scsi.c      Mike Christie      2020-09-21  577  	struct vhost_scsi_virtqueue *svq = container_of(vq,
aef0e1e9298ab68f drivers/vhost/scsi.c      Mike Christie      2020-09-21  578  					struct vhost_scsi_virtqueue, vq);
1a1ff8256af679c8 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  579  	struct vhost_scsi_cmd *cmd;
1a1ff8256af679c8 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  580  	struct vhost_scsi_nexus *tv_nexus;
b1935f687bb93b20 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  581  	struct scatterlist *sg, *prot_sg;
3aee26b4ae91048c drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  582  	struct page **pages;
10e9cbb6b531117b drivers/vhost/scsi.c      Matthew Wilcox     2018-06-12  583  	int tag, cpu;
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  584  
9871831283e79575 drivers/vhost/scsi.c      Asias He           2013-05-06  585  	tv_nexus = tpg->tpg_nexus;
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  586  	if (!tv_nexus) {
1a1ff8256af679c8 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  587  		pr_err("Unable to locate active struct vhost_scsi_nexus\n");
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  588  		return ERR_PTR(-EIO);
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  589  	}
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  590  
aef0e1e9298ab68f drivers/vhost/scsi.c      Mike Christie      2020-09-21  591  	tag = sbitmap_get(&svq->scsi_tags, 0, false);
4a47d3a1ff10e564 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  592  	if (tag < 0) {
1a1ff8256af679c8 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  593  		pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
4a47d3a1ff10e564 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  594  		return ERR_PTR(-ENOMEM);
4a47d3a1ff10e564 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  595  	}
4a47d3a1ff10e564 drivers/vhost/scsi.c      Nicholas Bellinger 2013-09-23  596  
aef0e1e9298ab68f drivers/vhost/scsi.c      Mike Christie      2020-09-21  597  	cmd = &svq->scsi_cmds[tag];
3aee26b4ae91048c drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  598  	sg = cmd->tvc_sgl;
b1935f687bb93b20 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  599  	prot_sg = cmd->tvc_prot_sgl;
3aee26b4ae91048c drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  600  	pages = cmd->tvc_upages;
473f0b15a4c97d39 drivers/vhost/scsi.c      Markus Elfring     2017-05-20  601  	memset(cmd, 0, sizeof(*cmd));
3aee26b4ae91048c drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  602  	cmd->tvc_sgl = sg;
b1935f687bb93b20 drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  603  	cmd->tvc_prot_sgl = prot_sg;
3aee26b4ae91048c drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-21  604  	cmd->tvc_upages = pages;
4824d3bfb9097ac5 drivers/vhost/scsi.c      Nicholas Bellinger 2013-06-07  605  	cmd->tvc_se_cmd.map_tag = tag;
10e9cbb6b531117b drivers/vhost/scsi.c      Matthew Wilcox     2018-06-12 @606  	cmd->tvc_se_cmd.map_cpu = cpu;

"cpu" is never initialized.

95e7c4341b8e28da drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  607  	cmd->tvc_tag = scsi_tag;
95e7c4341b8e28da drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  608  	cmd->tvc_lun = lun;
95e7c4341b8e28da drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  609  	cmd->tvc_task_attr = task_attr;
3c63f66a0dcdd6cb drivers/vhost/scsi.c      Asias He           2013-05-06  610  	cmd->tvc_exp_data_len = exp_data_len;
3c63f66a0dcdd6cb drivers/vhost/scsi.c      Asias He           2013-05-06  611  	cmd->tvc_data_direction = data_direction;
3c63f66a0dcdd6cb drivers/vhost/scsi.c      Asias He           2013-05-06  612  	cmd->tvc_nexus = tv_nexus;
1a1ff8256af679c8 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  613  	cmd->inflight = vhost_scsi_get_inflight(vq);
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  614  
1a1ff8256af679c8 drivers/vhost/scsi.c      Nicholas Bellinger 2015-01-31  615  	memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
95e7c4341b8e28da drivers/vhost/scsi.c      Nicholas Bellinger 2014-02-22  616  
3c63f66a0dcdd6cb drivers/vhost/scsi.c      Asias He           2013-05-06  617  	return cmd;
057cbf49a1f08297 drivers/vhost/tcm_vhost.c Nicholas Bellinger 2012-07-18  618  }

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-21 18:23 [PATCH 0/8] vhost scsi: fixes and cleanups Mike Christie
2020-09-21 18:23 ` [PATCH 1/8] vhost vdpa: fix vhost_vdpa_open error handling Mike Christie
2020-09-22  1:58   ` Jason Wang
2020-09-21 18:23 ` [PATCH 2/8] vhost: add helper to check if a vq has been setup Mike Christie
2020-09-22  2:02   ` Jason Wang
2020-09-23 19:12     ` Mike Christie
2020-09-24  7:22       ` Jason Wang
2020-09-22  2:45   ` Bart Van Assche
2020-09-22 15:34     ` Michael Christie
2020-09-21 18:23 ` [PATCH 3/8] vhost scsi: alloc cmds per vq instead of session Mike Christie
2020-09-22  1:32   ` kernel test robot
2020-09-23  7:53   ` Dan Carpenter [this message]
2020-09-24  6:22   ` Michael S. Tsirkin
2020-09-24 15:31     ` Michael Christie
2020-09-21 18:23 ` [PATCH 4/8] vhost scsi: fix cmd completion race Mike Christie
2020-09-22  2:48   ` Bart Van Assche
2020-09-22  2:51     ` Bart Van Assche
2020-09-21 18:23 ` [PATCH 5/8] vhost scsi: add lun parser helper Mike Christie
2020-09-23 10:23   ` Paolo Bonzini
2020-09-21 18:23 ` [PATCH 6/8] vhost scsi: Add support for LUN resets Mike Christie
2020-09-21 18:23 ` [PATCH 7/8] vhost: remove work arg from vhost_work_flush Mike Christie
2020-09-22  2:01   ` Jason Wang
2020-09-21 18:23 ` [PATCH 8/8] vhost scsi: remove extra flushes Mike Christie

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