linux-kernel - RE: [PATCH] ZEN: fix platform_no_drv

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Date:   Mon, 15 Apr 2019 06:31:03 +0000
From:   "Reshetova, Elena" <elena.reshetova@...el.com>
To:     Julia Lawall <julia.lawall@...6.fr>,
        "Jan Alexander Steffens (heftig)" <jan.steffens@...il.com>
CC:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kbuild-all@...org" <kbuild-all@...org>
Subject: RE: [PATCH] ZEN: fix platform_no_drv_owner.cocci warnings


> From: kbuild test robot <lkp@...el.com>
> 
> Remove .owner field if calls are used which set it automatically
> 
> Generated by: scripts/coccinelle/api/platform_no_drv_owner.cocci
> 
> Fixes: 26e2aa63d568 ("ZEN: Add VHBA driver")
> Signed-off-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Julia Lawall <julia.lawall@...6.fr>
> 
> ---
> 
> There was also a report about:
> 
> drivers/scsi/vhba/vhba.c:184:8-27: atomic_dec_and_test variation before
> object free at line 185.
> 
> that Elena may want to comment on.
> 
>

Yes, on a quick look it seems that you should be using refcount_t type and not
atomic_t for your reference counter, as you use it as classical refcounter, i.e. 
free  the object upon reaching zero, etc:

static void vhba_device_put (struct vhba_device *vdev)
{
    if (atomic_dec_and_test(&vdev->refcnt)) {
        kfree(vdev);
    }
}

Any reason why you didn't use refcount_t type to begin with?

Best Regards,
Elena.