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target: use save/restore lock primitive in core_dec_lacl_count() 

It may happen that uasp will free the request in irq conntext, the
callchain:

 uasp_cmd_release() -> transport_generic_free_cmd() -> core_dec_lacl_count()

where the last function enables the IRQ. Those irqs are re-disabled
later (due to the spin.*irq_restore) but in between we could get hurt.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sebastian Andrzej Siewior 2012-01-10 14:16:58 +01:00 committed by Nicholas Bellinger
parent e59a41b69a
commit 1dd0a06745
1 changed files with 3 additions and 2 deletions
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5
drivers/target/target_core_device.c
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@ -320,11 +320,12 @@ int core_free_device_list_for_node(
void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
{
struct se_dev_entry *deve;
unsigned long flags;
spin_lock_irq(&se_nacl->device_list_lock);
spin_lock_irqsave(&se_nacl->device_list_lock, flags);
deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
deve->deve_cmds--;
spin_unlock_irq(&se_nacl->device_list_lock);
spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
}
void core_update_device_list_access(