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authorJames Bottomley <James.Bottomley@suse.de>2009-11-19 17:48:29 -0500
committerJames Bottomley <James.Bottomley@suse.de>2009-11-26 09:43:39 -0600
commit860dc73608a091e0b325218acc2701709d5f221a (patch)
tree2527b226e1991c459ac02de4a6ba5c98a4639add
parent3bf3583b6a49c318f7ed350862d7a217b500e71c (diff)
downloadop-kernel-dev-860dc73608a091e0b325218acc2701709d5f221a.zip
op-kernel-dev-860dc73608a091e0b325218acc2701709d5f221a.tar.gz
[SCSI] fix async scan add/remove race resulting in an oops
Async scanning introduced a very wide window where the SCSI device is up and running but has not yet been added to sysfs. We delay the adding until all scans have completed to retain the same ordering as sync scanning. This delay in visibility causes an oops if a device is removed before we make it visible because the SCSI removal routines have an inbuilt assumption that if a device is in SDEV_RUNNING state, it must be visible (which is not necessarily true in the async scanning case). Fix this by introducing an additional is_visible flag which we can use to condition the tear down so we do the right thing for running but not yet made visible. Reported-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
-rw-r--r--drivers/scsi/scsi_scan.c18
-rw-r--r--drivers/scsi/scsi_sysfs.c63
-rw-r--r--include/scsi/scsi_device.h1
3 files changed, 32 insertions, 50 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 0547a7f..47291bc 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -952,16 +952,6 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
return SCSI_SCAN_LUN_PRESENT;
}
-static inline void scsi_destroy_sdev(struct scsi_device *sdev)
-{
- scsi_device_set_state(sdev, SDEV_DEL);
- if (sdev->host->hostt->slave_destroy)
- sdev->host->hostt->slave_destroy(sdev);
- transport_destroy_device(&sdev->sdev_gendev);
- put_device(&sdev->sdev_dev);
- put_device(&sdev->sdev_gendev);
-}
-
#ifdef CONFIG_SCSI_LOGGING
/**
* scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
@@ -1139,7 +1129,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
}
}
} else
- scsi_destroy_sdev(sdev);
+ __scsi_remove_device(sdev);
out:
return res;
}
@@ -1500,7 +1490,7 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
/*
* the sdev we used didn't appear in the report luns scan
*/
- scsi_destroy_sdev(sdev);
+ __scsi_remove_device(sdev);
return ret;
}
@@ -1710,7 +1700,7 @@ static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
shost_for_each_device(sdev, shost) {
if (!scsi_host_scan_allowed(shost) ||
scsi_sysfs_add_sdev(sdev) != 0)
- scsi_destroy_sdev(sdev);
+ __scsi_remove_device(sdev);
}
}
@@ -1943,7 +1933,7 @@ void scsi_free_host_dev(struct scsi_device *sdev)
{
BUG_ON(sdev->id != sdev->host->this_id);
- scsi_destroy_sdev(sdev);
+ __scsi_remove_device(sdev);
}
EXPORT_SYMBOL(scsi_free_host_dev);
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 5c7eb63..392d8db 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -854,82 +854,73 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
transport_configure_device(&starget->dev);
error = device_add(&sdev->sdev_gendev);
if (error) {
- put_device(sdev->sdev_gendev.parent);
printk(KERN_INFO "error 1\n");
- return error;
+ goto out_remove;
}
error = device_add(&sdev->sdev_dev);
if (error) {
printk(KERN_INFO "error 2\n");
- goto clean_device;
+ device_del(&sdev->sdev_gendev);
+ goto out_remove;
}
+ transport_add_device(&sdev->sdev_gendev);
+ sdev->is_visible = 1;
/* create queue files, which may be writable, depending on the host */
if (sdev->host->hostt->change_queue_depth)
error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
else
error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
- if (error) {
- __scsi_remove_device(sdev);
- goto out;
- }
+ if (error)
+ goto out_remove;
+
if (sdev->host->hostt->change_queue_type)
error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
else
error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
- if (error) {
- __scsi_remove_device(sdev);
- goto out;
- }
+ if (error)
+ goto out_remove;
error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
if (error)
+ /* we're treating error on bsg register as non-fatal,
+ * so pretend nothing went wrong */
sdev_printk(KERN_INFO, sdev,
"Failed to register bsg queue, errno=%d\n", error);
- /* we're treating error on bsg register as non-fatal, so pretend
- * nothing went wrong */
- error = 0;
-
/* add additional host specific attributes */
if (sdev->host->hostt->sdev_attrs) {
for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
error = device_create_file(&sdev->sdev_gendev,
sdev->host->hostt->sdev_attrs[i]);
- if (error) {
- __scsi_remove_device(sdev);
- goto out;
- }
+ if (error)
+ goto out_remove;
}
}
- transport_add_device(&sdev->sdev_gendev);
- out:
- return error;
-
- clean_device:
- scsi_device_set_state(sdev, SDEV_CANCEL);
-
- device_del(&sdev->sdev_gendev);
- transport_destroy_device(&sdev->sdev_gendev);
- put_device(&sdev->sdev_dev);
- put_device(&sdev->sdev_gendev);
+ return 0;
+ out_remove:
+ __scsi_remove_device(sdev);
return error;
+
}
void __scsi_remove_device(struct scsi_device *sdev)
{
struct device *dev = &sdev->sdev_gendev;
- if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
- return;
+ if (sdev->is_visible) {
+ if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
+ return;
- bsg_unregister_queue(sdev->request_queue);
- device_unregister(&sdev->sdev_dev);
- transport_remove_device(dev);
- device_del(dev);
+ bsg_unregister_queue(sdev->request_queue);
+ device_unregister(&sdev->sdev_dev);
+ transport_remove_device(dev);
+ device_del(dev);
+ } else
+ put_device(&sdev->sdev_dev);
scsi_device_set_state(sdev, SDEV_DEL);
if (sdev->host->hostt->slave_destroy)
sdev->host->hostt->slave_destroy(sdev);
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 9af48cb..f097ae3 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -145,6 +145,7 @@ struct scsi_device {
unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
unsigned last_sector_bug:1; /* do not use multisector accesses on
SD_LAST_BUGGY_SECTORS */
+ unsigned is_visible:1; /* is the device visible in sysfs */
DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
struct list_head event_list; /* asserted events */
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