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scsi-disk: Improve error messager if can't get version number 

More often it is that bdrv_ioctl fails due to not supported by driver or
whatever reason, in this case we should be specific, because "interface
too old" is very confusing.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Fam Zheng 2014-04-16 10:09:16 +08:00 committed by Paolo Bonzini
parent 411f491e0a
commit 4bbeb8b173
1 changed files with 7 additions and 2 deletions
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9
hw/scsi/scsi-disk.c
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@ -2463,8 +2463,13 @@ static int scsi_block_initfn(SCSIDevice *dev)
}
/* check we are using a driver managing SG_IO (version 3 and after) */
if (bdrv_ioctl(s->qdev.conf.bs, SG_GET_VERSION_NUM, &sg_version) < 0 ||
sg_version < 30000) {
rc = bdrv_ioctl(s->qdev.conf.bs, SG_GET_VERSION_NUM, &sg_version);
if (rc < 0) {
error_report("scsi-block: can not get version number: %s",
strerror(-rc));
return -1;
}
if (sg_version < 30000) {
error_report("scsi-block: scsi generic interface too old");
return -1;
}