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[SCSI] libiscsi: use bh locking instead of irq with session lock 

The session lock is taken in threads, timers, and bottom halves
like softirqs and tasklets. All the code but
iscsi_conn/session_failure take the session lock with the spin_lock_bh
call. This was done because I thought some offload drivers
would be calling these functions from a irq. They never did,
so this patch has iscsi_conn/session_failure use the bh
locking.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Mike Christie 2010-12-31 02:22:22 -06:00 committed by James Bottomley
parent f41d472179
commit bfcf72e442
1 changed files with 6 additions and 8 deletions
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14
drivers/scsi/libiscsi.c
View File

@ -1338,17 +1338,16 @@ void iscsi_session_failure(struct iscsi_session *session,
{
struct iscsi_conn *conn;
struct device *dev;
unsigned long flags;
spin_lock_irqsave(&session->lock, flags);
spin_lock_bh(&session->lock);
conn = session->leadconn;
if (session->state == ISCSI_STATE_TERMINATE || !conn) {
spin_unlock_irqrestore(&session->lock, flags);
spin_unlock_bh(&session->lock);
return;
}
dev = get_device(&conn->cls_conn->dev);
spin_unlock_irqrestore(&session->lock, flags);
spin_unlock_bh(&session->lock);
if (!dev)
return;
/*
@ -1367,17 +1366,16 @@ EXPORT_SYMBOL_GPL(iscsi_session_failure);
void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
{
struct iscsi_session *session = conn->session;
unsigned long flags;
spin_lock_irqsave(&session->lock, flags);
spin_lock_bh(&session->lock);
if (session->state == ISCSI_STATE_FAILED) {
spin_unlock_irqrestore(&session->lock, flags);
spin_unlock_bh(&session->lock);
return;
}
if (conn->stop_stage == 0)
session->state = ISCSI_STATE_FAILED;
spin_unlock_irqrestore(&session->lock, flags);
spin_unlock_bh(&session->lock);
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);