Changing the state of a SCSI device via sysfs into "cancel" or
"deleted" prevents removal of these devices by scsi_remove_host().
Hence do not allow this. Also, introduce the symbolic name
INVALID_SDEV_STATE, representing a value different from any valid
SCSI device state. Update scsi_device_set_state() such that gcc
does not issue a warning about an enumeration value not being
handled inside a switch statement.
Signed-off-by: Bart Van Assche <bvanass...@acm.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: James Bottomley <jbottom...@parallels.com>
Cc: Mike Christie <micha...@cs.wisc.edu>
Cc: Hannes Reinecke <h...@suse.de>
Cc: David Milburn <dmilb...@redhat.com>
---
drivers/scsi/scsi_lib.c | 2 ++
drivers/scsi/scsi_sysfs.c | 5 +++--
include/scsi/scsi_device.h | 6 +++++-
3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 34cdcbc..67d09a7 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2184,6 +2184,8 @@ scsi_device_set_state(struct scsi_device *sdev, enum
scsi_device_state state)
}
break;
+ case INVALID_SDEV_STATE:
+ goto illegal;
}
sdev->sdev_state = state;
return 0;
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index f869ef85..fe3ea686 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -594,7 +594,7 @@ store_state_field(struct device *dev, struct
device_attribute *attr,
{
int i;
struct scsi_device *sdev = to_scsi_device(dev);
- enum scsi_device_state state = 0;
+ enum scsi_device_state state = INVALID_SDEV_STATE;
for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
const int len = strlen(sdev_states[i].name);
@@ -604,7 +604,8 @@ store_state_field(struct device *dev, struct
device_attribute *attr,
break;
}
}
- if (!state)
+ if (state == INVALID_SDEV_STATE || state == SDEV_CANCEL ||
+ state == SDEV_DEL)
return -EINVAL;
if (scsi_device_set_state(sdev, state))
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index a7f9cba..8539ce6 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -29,7 +29,11 @@ struct scsi_mode_data {
* scsi_lib:scsi_device_set_state().
*/
enum scsi_device_state {
- SDEV_CREATED = 1, /* device created but not added to sysfs
+ INVALID_SDEV_STATE, /* Not a valid SCSI device state but a
+ * symbolic name that can be used wherever
+ * a value is needed that is different from
+ * any valid SCSI device state. */
+ SDEV_CREATED, /* device created but not added to sysfs
* Only internal commands allowed (for inq) */
SDEV_RUNNING, /* device properly configured
* All commands allowed */
--
1.7.10.4
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