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

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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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1
drivers/infiniband/ulp/srp/ib_srp.h
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@@ -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;