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[SCSI] libfc: convert rport lookup to be RCU safe

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To allow LLD to do lookups on rports without grabbing a mutex,
make them RCU-safe.  The caller of lport->tt.rport_lookup will
have the choice of holding disc_mutex or the rcu_read_lock().

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt
2010-07-20 15:19:37 -07:00
committed by James Bottomley
parent 519e5135e2
commit 42e9041467
3 changed files with 23 additions and 7 deletions
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2
include/scsi/libfc.h
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@@ -195,6 +195,7 @@ struct fc_rport_libfc_priv {
* @rp_mutex: The mutex that protects the remote port
* @retry_work: Handle for retries
* @event_callback: Callback when READY, FAILED or LOGO states complete
* @rcu: Structure used for freeing in an RCU-safe manner
*/
struct fc_rport_priv {
struct fc_lport *local_port;
@@ -217,6 +218,7 @@ struct fc_rport_priv {
struct list_head peers;
struct work_struct event_work;
u32 supported_classes;
struct rcu_head rcu;
};
/**