Re: [PATCH v2 8/8] scsi: sr: wait for the medium to become ready

[Michal Suchánek]

On Wed, Oct 23, 2019 at 07:24:06PM -0700, Christoph Hellwig wrote:
> On Wed, Oct 23, 2019 at 02:52:47PM +0200, Michal Suchanek wrote:
> > +static int sr_block_open_finish(struct block_device *bdev, fmode_t mode,
> > +				int ret)
> > +{
> > +	struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
> > +
> > +	/* wait for drive to get ready */
> > +	if ((ret == -ENOMEDIUM) && !(mode & FMODE_NDELAY)) {
> > +		struct scsi_device *sdev = cd->device;
> > +		/*
> > +		 * Cannot use sr_block_ioctl because it locks sr_mutex blocking
> > +		 * out any processes trying to access the drive
> > +		 */
> > +		scsi_autopm_get_device(sdev);
> > +		cdrom_ioctl(&cd->cdi, bdev, mode, CDROM_AUTOCLOSE, 0);
> > +		ret = __sr_block_open(bdev, mode);
> > +		scsi_autopm_put_device(sdev);
> 
> Ioctls should never be used from kernel space.  We have a few leftovers,
> but we need to get rid of that and not add more.

What is the alternative?

Thanks

Michal