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authorMike Christie <michaelc@cs.wisc.edu>2007-12-13 12:43:28 -0600
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-11 18:28:31 -0600
commitbc436b278776d22eb10e7e75bf3e5257d14550a9 (patch)
tree98e3862e44333ef124becb957a0d0cd88ba24ed9
parentd8bf541e657824cb03effd726ac96e2f4dcf58a5 (diff)
downloadop-kernel-dev-bc436b278776d22eb10e7e75bf3e5257d14550a9.zip
op-kernel-dev-bc436b278776d22eb10e7e75bf3e5257d14550a9.tar.gz
[SCSI] libiscsi: grab eh_mutex during host reset
I thought we may not need the eh mutex during host reset, but that is wrong with the new shutdown code. When start_session_recovery sets the state to terminate then drops the session lock. The scsi eh thread could then grab the session lock see that we are terminating and then return failed to scsi-ml. scsi-ml's eh then owns the command and will do whatever it wants with it. But then the iscsi eh thread could grab the session lock and want to complete the scsi commands that we in the LLD, but it no longer owns them and kaboom. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/scsi/libiscsi.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index b7a2b9a..441e351 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1079,17 +1079,19 @@ int iscsi_eh_host_reset(struct scsi_cmnd *sc)
struct iscsi_session *session = iscsi_hostdata(host->hostdata);
struct iscsi_conn *conn = session->leadconn;
+ mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
if (session->state == ISCSI_STATE_TERMINATE) {
failed:
debug_scsi("failing host reset: session terminated "
"[CID %d age %d]\n", conn->id, session->age);
spin_unlock_bh(&session->lock);
+ mutex_unlock(&session->eh_mutex);
return FAILED;
}
spin_unlock_bh(&session->lock);
-
+ mutex_unlock(&session->eh_mutex);
/*
* we drop the lock here but the leadconn cannot be destoyed while
* we are in the scsi eh
@@ -1104,13 +1106,14 @@ failed:
if (signal_pending(current))
flush_signals(current);
+ mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
if (session->state == ISCSI_STATE_LOGGED_IN)
printk(KERN_INFO "iscsi: host reset succeeded\n");
else
goto failed;
spin_unlock_bh(&session->lock);
-
+ mutex_unlock(&session->eh_mutex);
return SUCCESS;
}
EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
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