diff options
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 48 |
1 files changed, 34 insertions, 14 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index a86e62f4b3b..b53c5f67e37 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -85,7 +85,7 @@ static unsigned int max_scsi_luns = MAX_SCSI_LUNS; static unsigned int max_scsi_luns = 1; #endif -module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR); +module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR); MODULE_PARM_DESC(max_luns, "last scsi LUN (should be between 1 and 2^32-1)"); @@ -109,18 +109,19 @@ MODULE_PARM_DESC(scan, "sync, async or none"); */ static unsigned int max_scsi_report_luns = 511; -module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR); +module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR); MODULE_PARM_DESC(max_report_luns, "REPORT LUNS maximum number of LUNS received (should be" " between 1 and 16384)"); static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; -module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR); +module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); MODULE_PARM_DESC(inq_timeout, "Timeout (in seconds) waiting for devices to answer INQUIRY." " Default is 5. Some non-compliant devices need more."); +/* This lock protects only this list */ static DEFINE_SPINLOCK(async_scan_lock); static LIST_HEAD(scanning_hosts); @@ -1466,14 +1467,14 @@ struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, if (strncmp(scsi_scan_type, "none", 4) == 0) return ERR_PTR(-ENODEV); - if (!shost->async_scan) - scsi_complete_async_scans(); - starget = scsi_alloc_target(parent, channel, id); if (!starget) return ERR_PTR(-ENOMEM); mutex_lock(&shost->scan_mutex); + if (!shost->async_scan) + scsi_complete_async_scans(); + if (scsi_host_scan_allowed(shost)) scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); mutex_unlock(&shost->scan_mutex); @@ -1586,10 +1587,10 @@ void scsi_scan_target(struct device *parent, unsigned int channel, if (strncmp(scsi_scan_type, "none", 4) == 0) return; + mutex_lock(&shost->scan_mutex); if (!shost->async_scan) scsi_complete_async_scans(); - mutex_lock(&shost->scan_mutex); if (scsi_host_scan_allowed(shost)) __scsi_scan_target(parent, channel, id, lun, rescan); mutex_unlock(&shost->scan_mutex); @@ -1634,15 +1635,15 @@ int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, "%s: <%u:%u:%u>\n", __FUNCTION__, channel, id, lun)); - if (!shost->async_scan) - scsi_complete_async_scans(); - if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) return -EINVAL; mutex_lock(&shost->scan_mutex); + if (!shost->async_scan) + scsi_complete_async_scans(); + if (scsi_host_scan_allowed(shost)) { if (channel == SCAN_WILD_CARD) for (channel = 0; channel <= shost->max_channel; @@ -1661,7 +1662,8 @@ static void scsi_sysfs_add_devices(struct Scsi_Host *shost) { struct scsi_device *sdev; shost_for_each_device(sdev, shost) { - if (scsi_sysfs_add_sdev(sdev) != 0) + if (!scsi_host_scan_allowed(shost) || + scsi_sysfs_add_sdev(sdev) != 0) scsi_destroy_sdev(sdev); } } @@ -1679,6 +1681,7 @@ static void scsi_sysfs_add_devices(struct Scsi_Host *shost) static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) { struct async_scan_data *data; + unsigned long flags; if (strncmp(scsi_scan_type, "sync", 4) == 0) return NULL; @@ -1698,8 +1701,13 @@ static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) goto err; init_completion(&data->prev_finished); - spin_lock(&async_scan_lock); + mutex_lock(&shost->scan_mutex); + spin_lock_irqsave(shost->host_lock, flags); shost->async_scan = 1; + spin_unlock_irqrestore(shost->host_lock, flags); + mutex_unlock(&shost->scan_mutex); + + spin_lock(&async_scan_lock); if (list_empty(&scanning_hosts)) complete(&data->prev_finished); list_add_tail(&data->list, &scanning_hosts); @@ -1723,11 +1731,15 @@ static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) static void scsi_finish_async_scan(struct async_scan_data *data) { struct Scsi_Host *shost; + unsigned long flags; if (!data) return; shost = data->shost; + + mutex_lock(&shost->scan_mutex); + if (!shost->async_scan) { printk("%s called twice for host %d", __FUNCTION__, shost->host_no); @@ -1739,8 +1751,13 @@ static void scsi_finish_async_scan(struct async_scan_data *data) scsi_sysfs_add_devices(shost); - spin_lock(&async_scan_lock); + spin_lock_irqsave(shost->host_lock, flags); shost->async_scan = 0; + spin_unlock_irqrestore(shost->host_lock, flags); + + mutex_unlock(&shost->scan_mutex); + + spin_lock(&async_scan_lock); list_del(&data->list); if (!list_empty(&scanning_hosts)) { struct async_scan_data *next = list_entry(scanning_hosts.next, @@ -1782,6 +1799,7 @@ static int do_scan_async(void *_data) **/ void scsi_scan_host(struct Scsi_Host *shost) { + struct task_struct *p; struct async_scan_data *data; if (strncmp(scsi_scan_type, "none", 4) == 0) @@ -1793,7 +1811,9 @@ void scsi_scan_host(struct Scsi_Host *shost) return; } - kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no); + p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no); + if (unlikely(IS_ERR(p))) + do_scan_async(data); } EXPORT_SYMBOL(scsi_scan_host); |