Messages in this thread | | | Date | Sun, 30 Jan 2011 01:26:22 +0000 | From | Simon Arlott <> | Subject | Re: [PATCH 7/8] sr: implement sr_check_events() |
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On 08/12/10 19:57, Tejun Heo wrote: > Replace sr_media_change() with sr_check_events(). It normally only > uses GET_EVENT_STATUS_NOTIFICATION to check both media change and > eject request. If @clearing includes DISK_EVENT_MEDIA_CHANGE, it > issues TUR and compares whether media presence has changed. The SCSI > specific media change uevent is kept for compatibility. > > sr_media_change() was doing both media change check and revalidation. > The revalidation part is split into sr_block_revalidate_disk(). > > Signed-off-by: Tejun Heo <tj@kernel.org> > Cc: Kay Sievers <kay.sievers@vrfy.org> > --- > drivers/scsi/sr.c | 147 +++++++++++++++++++++++++++++++++------------------ > drivers/scsi/sr.h | 2 +- > include/scsi/scsi.h | 1 + > 3 files changed, 98 insertions(+), 52 deletions(-)
This breaks growisofs: :-( /dev/dvd: CD_ROM_MEDIA_CHANGED ioctl failed: Inappropriate ioctl for device
SR_CAPABILITIES in sr.c includes CDC_MEDIA_CHANGED but cdrom.c removes this capability in register_cdrom because there is no media_changed op: ENSURE(media_changed, CDC_MEDIA_CHANGED);
The ioctl function cdrom_ioctl_media_changed() then returns -ENOSYS.
The media_changed() function again checks this capability but never uses the media_changed op if the check_events op exists.
The cdrom_media_changed() function requires the media_changed op but then calls media_changed().
It looks like cdrom_select_disc() is going to dereference the NULL media_changed pointer if both check_events and media_changed don't exist.
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c > index f6d8ee4..1e4b9b1 100644 > --- a/drivers/scsi/sr.c > +++ b/drivers/scsi/sr.c > @@ -104,14 +104,15 @@ static void sr_release(struct cdrom_device_info *); > static void get_sectorsize(struct scsi_cd *); > static void get_capabilities(struct scsi_cd *); > > -static int sr_media_change(struct cdrom_device_info *, int); > +static unsigned int sr_check_events(struct cdrom_device_info *cdi, > + unsigned int clearing, int slot); > static int sr_packet(struct cdrom_device_info *, struct packet_command *); > > static struct cdrom_device_ops sr_dops = { > .open = sr_open, > .release = sr_release, > .drive_status = sr_drive_status, > - .media_changed = sr_media_change, > + .check_events = sr_check_events, > .tray_move = sr_tray_move, > .lock_door = sr_lock_door, > .select_speed = sr_select_speed, > @@ -165,69 +166,96 @@ static void scsi_cd_put(struct scsi_cd *cd) > mutex_unlock(&sr_ref_mutex); > }
-- Simon Arlott
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