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IB/srp: Keep rport as long as the IB transport layer 

Keep the rport data structure around after srp_remove_host() has
finished until cleanup of the IB transport layer has finished
completely. This is necessary because later patches use the rport
pointer inside the queuecommand callback. Without this patch
accessing the rport from inside a queuecommand callback is racy
because srp_remove_host() must be invoked before scsi_remove_host()
and because the queuecommand callback could get invoked after
srp_remove_host() has finished. In other words, without this patch
the queuecommand callback can get invoked after the rport data
structure has been freed.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Bart Van Assche 2013-10-26 14:32:30 +02:00 committed by Roland Dreier
parent 7bb312e4a2
commit 9dd69a600a
4 changed files with 24 additions and 0 deletions
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3
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -528,11 +528,13 @@ static void srp_remove_target(struct srp_target_port *target)
WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
srp_del_scsi_host_attr(target->scsi_host);
srp_rport_get(target->rport);
srp_remove_host(target->scsi_host);
scsi_remove_host(target->scsi_host);
srp_disconnect_target(target);
ib_destroy_cm_id(target->cm_id);
srp_free_target_ib(target);
srp_rport_put(target->rport);
srp_free_req_data(target);
scsi_host_put(target->scsi_host);
}
@ -2004,6 +2006,7 @@ static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
}
rport->lld_data = target;
target->rport = rport;
spin_lock(&host->target_lock);
list_add_tail(&target->list, &host->target_list);

1
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -153,6 +153,7 @@ struct srp_target_port {
u16 io_class;
struct srp_host *srp_host;
struct Scsi_Host *scsi_host;
struct srp_rport *rport;
char target_name[32];
unsigned int scsi_id;
unsigned int sg_tablesize;

18
drivers/scsi/scsi_transport_srp.c
View File

@ -184,6 +184,24 @@ static int srp_host_match(struct attribute_container *cont, struct device *dev)
return &i->t.host_attrs.ac == cont;
}
/**
* srp_rport_get() - increment rport reference count
*/
void srp_rport_get(struct srp_rport *rport)
{
get_device(&rport->dev);
}
EXPORT_SYMBOL(srp_rport_get);
/**
* srp_rport_put() - decrement rport reference count
*/
void srp_rport_put(struct srp_rport *rport)
{
put_device(&rport->dev);
}
EXPORT_SYMBOL(srp_rport_put);
/**
* srp_rport_add - add a SRP remote port to the device hierarchy
* @shost: scsi host the remote port is connected to.

2
include/scsi/scsi_transport_srp.h
View File

@ -38,6 +38,8 @@ extern struct scsi_transport_template *
srp_attach_transport(struct srp_function_template *);
extern void srp_release_transport(struct scsi_transport_template *);
extern void srp_rport_get(struct srp_rport *rport);
extern void srp_rport_put(struct srp_rport *rport);
extern struct srp_rport *srp_rport_add(struct Scsi_Host *,
struct srp_rport_identifiers *);
extern void srp_rport_del(struct srp_rport *);