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scsi/scsi_bus: Add scsi_device_get 

Add scsi_device_get which finds the scsi device
and takes a reference to it.

Suggested-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20200913160259.32145-8-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201006123904.610658-12-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2020-10-06 15:39:02 +03:00 committed by Paolo Bonzini
parent 8ddf958e8d
commit 8ff3449560
2 changed files with 12 additions and 0 deletions
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11
hw/scsi/scsi-bus.c
View File

@ -73,6 +73,17 @@ SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
return do_scsi_device_find(bus, channel, id, lun, false); return do_scsi_device_find(bus, channel, id, lun, false);
} }
SCSIDevice *scsi_device_get(SCSIBus *bus, int channel, int id, int lun)
{
SCSIDevice *d;
RCU_READ_LOCK_GUARD();
d = do_scsi_device_find(bus, channel, id, lun, false);
if (d) {
object_ref(d);
}
return d;
}
static void scsi_device_realize(SCSIDevice *s, Error **errp) static void scsi_device_realize(SCSIDevice *s, Error **errp)
{ {
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s); SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);

1
include/hw/scsi/scsi.h
View File

@ -190,6 +190,7 @@ int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed);
int scsi_SG_IO_FROM_DEV(BlockBackend *blk, uint8_t *cmd, uint8_t cmd_size, int scsi_SG_IO_FROM_DEV(BlockBackend *blk, uint8_t *cmd, uint8_t cmd_size,
uint8_t *buf, uint8_t buf_size); uint8_t *buf, uint8_t buf_size);
SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int target, int lun); SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int target, int lun);
SCSIDevice *scsi_device_get(SCSIBus *bus, int channel, int target, int lun);
/* scsi-generic.c. */ /* scsi-generic.c. */
extern const SCSIReqOps scsi_generic_req_ops; extern const SCSIReqOps scsi_generic_req_ops;