04_scsi_remove_volatile.patch
scsi_device->device_busy, Scsi_Host->host_busy and
->host_failed have volatile qualifiers, but the qualifiers
don't serve any purpose. Kill them. While at it, protect
->host_failed update in scsi_error for consistency and clarity.
Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
scsi_device.h | 3 ++-
scsi_host.h | 10 ++++++++--
2 files changed, 10 insertions(+), 3 deletions(-)
Index: scsi-export/include/scsi/scsi_device.h
===================================================================
--- scsi-export.orig/include/scsi/scsi_device.h 2005-03-31 17:42:05.000000000
+0900
+++ scsi-export/include/scsi/scsi_device.h 2005-03-31 18:06:20.000000000
+0900
@@ -43,7 +43,8 @@ struct scsi_device {
struct list_head siblings; /* list of all devices on this host */
struct list_head same_target_siblings; /* just the devices sharing
same target id */
- volatile unsigned short device_busy; /* commands actually active on
low-level */
+ unsigned short device_busy; /* commands actually active on
+ * low-level. protected by sdev_lock. */
spinlock_t sdev_lock; /* also the request queue_lock */
spinlock_t list_lock;
struct list_head cmd_list; /* queue of in use SCSI Command
structures */
Index: scsi-export/include/scsi/scsi_host.h
===================================================================
--- scsi-export.orig/include/scsi/scsi_host.h 2005-03-31 17:42:05.000000000
+0900
+++ scsi-export/include/scsi/scsi_host.h 2005-03-31 18:06:20.000000000
+0900
@@ -448,8 +448,14 @@ struct Scsi_Host {
wait_queue_head_t host_wait;
struct scsi_host_template *hostt;
struct scsi_transport_template *transportt;
- volatile unsigned short host_busy; /* commands actually active on
low-level */
- volatile unsigned short host_failed; /* commands that failed. */
+
+ /*
+ * The following two fields are protected with host_lock;
+ * however, eh routines can safely access during eh processing
+ * without acquiring the lock.
+ */
+ unsigned short host_busy; /* commands actually active on
low-level */
+ unsigned short host_failed; /* commands that failed. */
unsigned short host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al.
*/
int resetting; /* if set, it means that last_reset is a valid value */
-
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