From 1dd0a0674530da61cdbfadd88c96949b483a7c19 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Tue, 10 Jan 2012 14:16:58 +0100 Subject: [PATCH] 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 Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_device.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 0c5992f..00159a4 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -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( -- 2.7.4