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Staging: hv: storvsc: Support hot-removing of scsi devices 

Support hot-removing of scsi devices.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-11-08 09:01:50 -08:00 committed by Greg Kroah-Hartman
parent 126757998a
commit b401731985
1 changed files with 45 additions and 0 deletions
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45
drivers/staging/hv/storvsc_drv.c
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@ -328,6 +328,27 @@ static void storvsc_bus_scan(struct work_struct *work)
kfree(wrk);
}
static void storvsc_remove_lun(struct work_struct *work)
{
struct storvsc_scan_work *wrk;
struct scsi_device *sdev;
wrk = container_of(work, struct storvsc_scan_work, work);
if (!scsi_host_get(wrk->host))
goto done;
sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
if (sdev) {
scsi_remove_device(sdev);
scsi_device_put(sdev);
}
scsi_host_put(wrk->host);
done:
kfree(wrk);
}
static inline struct storvsc_device *get_out_stor_device(
struct hv_device *device)
{
@ -1112,6 +1133,7 @@ static void storvsc_command_completion(struct hv_storvsc_request *request)
void (*scsi_done_fn)(struct scsi_cmnd *);
struct scsi_sense_hdr sense_hdr;
struct vmscsi_request *vm_srb;
struct storvsc_scan_work *wrk;
vm_srb = &request->vstor_packet.vm_srb;
if (cmd_request->bounce_sgl_count) {
@ -1134,6 +1156,29 @@ static void storvsc_command_completion(struct hv_storvsc_request *request)
else
scmnd->result = vm_srb->scsi_status;
/*
* If the LUN is invalid; remove the device.
*/
if (vm_srb->srb_status == 0x20) {
struct storvsc_device *stor_dev;
struct hv_device *dev = host_dev->dev;
struct Scsi_Host *host;
stor_dev = get_in_stor_device(dev);
host = stor_dev->host;
wrk = kmalloc(sizeof(struct storvsc_scan_work),
GFP_ATOMIC);
if (!wrk) {
scmnd->result = DID_TARGET_FAILURE << 16;
} else {
wrk->host = host;
wrk->lun = vm_srb->lun;
INIT_WORK(&wrk->work, storvsc_remove_lun);
schedule_work(&wrk->work);
}
}
if (scmnd->result) {
if (scsi_normalize_sense(scmnd->sense_buffer,
SCSI_SENSE_BUFFERSIZE, &sense_hdr))