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scsi: fix searching for an empty id 

The conditions for detecting no free target or LUN were wrong.

The LUN loop was followed by an "if" condition that is never
true, because the loop is exited as soon as lun becomes equal
to bus->info->max_lun, and never becomes greater than it.

The target loop had a wrong condition (<= instead of <).  Once
this is fixed, the loop would fail in the same way as the LUN
loop.

The fix is to see whether scsi_device_find returned the device with the
last (channel, target, LUN) pair, and fail if so.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-02-15 09:22:54 +01:00
parent 9fac25bf6e
commit d3d250bddb
1 changed files with 10 additions and 5 deletions
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15
hw/scsi-bus.c
View File

@ -132,6 +132,10 @@ static int scsi_qdev_init(DeviceState *qdev)
error_report("bad scsi device id: %d", dev->id);
goto err;
}
if (dev->lun != -1 && dev->lun > bus->info->max_lun) {
error_report("bad scsi device lun: %d", dev->lun);
goto err;
}
if (dev->id == -1) {
int id = -1;
@ -140,8 +144,8 @@ static int scsi_qdev_init(DeviceState *qdev)
}
do {
d = scsi_device_find(bus, dev->channel, ++id, dev->lun);
} while (d && d->lun == dev->lun && id <= bus->info->max_target);
if (id > bus->info->max_target) {
} while (d && d->lun == dev->lun && id < bus->info->max_target);
if (d && d->lun == dev->lun) {
error_report("no free target");
goto err;
}
@ -151,14 +155,15 @@ static int scsi_qdev_init(DeviceState *qdev)
do {
d = scsi_device_find(bus, dev->channel, dev->id, ++lun);
} while (d && d->lun == lun && lun < bus->info->max_lun);
if (lun > bus->info->max_lun) {
if (d && d->lun == lun) {
error_report("no free lun");
goto err;
}
dev->lun = lun;
} else {
d = scsi_device_find(bus, dev->channel, dev->id, dev->lun);
if (dev->lun == d->lun && dev != d) {
assert(d);
if (d->lun == dev->lun && dev != d) {
qdev_free(&d->qdev);
}
}
@ -217,7 +222,7 @@ int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
int res = 0, unit;
loc_push_none(&loc);
for (unit = 0; unit < bus->info->max_target; unit++) {
for (unit = 0; unit <= bus->info->max_target; unit++) {
dinfo = drive_get(IF_SCSI, bus->busnr, unit);
if (dinfo == NULL) {
continue;