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 <[EMAIL PROTECTED]>
ACK
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