Tejun Heo wrote:
Two subtle hotplug related bugs are found. * SCSI didn't use to issue commands to devices in SDEV_CANCEL state but now it does. For ATA devices, it means that SYNCHRONIZE_CACHE is issued even after libata tells SCSI midlayer that the SCSI device is offline now. When devices are swapped, SYNCHRONIZE_CACHE for the previous device can be issued to the later device. * Devices can be swapped while SCSI probing is in progress. SCSI device used to get associated with ATA device only after probing is complete, which means that SCSI device detaching is not performed while probing. This can result in mismatch between SCSI device and ATA device (e.g. sd attached to ATAPI device) if devices are swapped after INQUIRY but before probing is complete. This patch makes libata associate new SCSI device with ATA device before INQUIRY is issued and check whether SCSI device issuing a command matches dev->sdev on each command. Both bugs are fixed by this tighter coupling between SCSI device and ATA device. Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
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