On Thu, Jun 30, 2011 at 03:03:48PM +0200, Tejun Heo wrote: > From: Kay Sievers <kay.sievers@xxxxxxxx> > > Some broken devices indicates that media has changed on every > GET_EVENT_STATUS_NOTIFICATION. This translates into MEDIA_CHANGE > uevent on every open() which lets udev run into a loop. > > Verify GET_EVENT result against TUR and if it generates spurious > events for several times in a row, ignore the GET_EVENT events, and > trust only the TUR status. > > This is the log of a USB stick with a (broken) fake CDROM drive: > > scsi 5:0:0:0: Direct-Access SanDisk U3 Cruzer Micro 8.02 PQ: 0 ANSI: 0 CCS > sd 5:0:0:0: Attached scsi generic sg3 type 0 > scsi 5:0:0:1: CD-ROM SanDisk U3 Cruzer Micro 8.02 PQ: 0 ANSI: 0 > sd 5:0:0:0: [sdb] Attached SCSI removable disk > sr2: scsi3-mmc drive: 48x/48x tray > sr 5:0:0:1: Attached scsi CD-ROM sr2 > sr 5:0:0:1: Attached scsi generic sg4 type 5 > sr2: GET_EVENT and TUR disagree continuously, suppress GET_EVENT events > sd 5:0:0:0: [sdb] 31777279 512-byte logical blocks: (16.2 GB/15.1 GiB) > sd 5:0:0:0: [sdb] No Caching mode page present > sd 5:0:0:0: [sdb] Assuming drive cache: write through > sd 5:0:0:0: [sdb] No Caching mode page present > sd 5:0:0:0: [sdb] Assuming drive cache: write through > sdb: sdb1 > > -tj: Updated to consider only spurious GET_EVENT events among > different types of disagreement and allow using TUR for kernel > event polling after GET_EVENT is ignored. > > Reported-By: Markus Rathgeb maggu2810@xxxxxxxxxxxxxx > Signed-off-by: Kay Sievers <kay.sievers@xxxxxxxx> > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > Cc: stable@xxxxxxxxxx # >= v2.6.38, fixes udev busy looping w/ certain devices James, ping. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
