Commit 82f29467 authored by Mike Anderson's avatar Mike Anderson Committed by James Bottomley
Browse files

[SCSI] host state model update: mediate host add/remove race



Add support to not allow additions to a host when it is being removed.
Signed-off-by: default avatarMike Anderson <andmike@us.ibm.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent d2c9d9ea
......@@ -133,7 +133,9 @@ EXPORT_SYMBOL(scsi_host_set_state);
**/
void scsi_remove_host(struct Scsi_Host *shost)
{
down(&shost->scan_mutex);
scsi_host_set_state(shost, SHOST_CANCEL);
up(&shost->scan_mutex);
scsi_forget_host(shost);
scsi_proc_host_rm(shost);
......
......@@ -1251,9 +1251,12 @@ struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
get_device(&starget->dev);
down(&shost->scan_mutex);
res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
if (res != SCSI_SCAN_LUN_PRESENT)
sdev = ERR_PTR(-ENODEV);
if (scsi_host_scan_allowed(shost)) {
res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1,
hostdata);
if (res != SCSI_SCAN_LUN_PRESENT)
sdev = ERR_PTR(-ENODEV);
}
up(&shost->scan_mutex);
scsi_target_reap(starget);
put_device(&starget->dev);
......@@ -1403,11 +1406,15 @@ int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
return -EINVAL;
down(&shost->scan_mutex);
if (channel == SCAN_WILD_CARD)
for (channel = 0; channel <= shost->max_channel; channel++)
if (scsi_host_scan_allowed(shost)) {
if (channel == SCAN_WILD_CARD)
for (channel = 0; channel <= shost->max_channel;
channel++)
scsi_scan_channel(shost, channel, id, lun,
rescan);
else
scsi_scan_channel(shost, channel, id, lun, rescan);
else
scsi_scan_channel(shost, channel, id, lun, rescan);
}
up(&shost->scan_mutex);
return 0;
......
......@@ -650,6 +650,15 @@ static inline struct device *scsi_get_device(struct Scsi_Host *shost)
return shost->shost_gendev.parent;
}
/**
* scsi_host_scan_allowed - Is scanning of this host allowed
* @shost: Pointer to Scsi_Host.
**/
static inline int scsi_host_scan_allowed(struct Scsi_Host *shost)
{
return shost->shost_state == SHOST_RUNNING;
}
extern void scsi_unblock_requests(struct Scsi_Host *);
extern void scsi_block_requests(struct Scsi_Host *);
......
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