diff options
| author | Roland Dreier <roland@purestorage.com> | 2011-07-20 09:09:10 +0000 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2011-07-22 09:37:45 +0000 |
| commit | 78faae37897dc2a9ccc7c19155294a4bfdcae077 (patch) | |
| tree | 36db87c44506bd34da1d21633dbfe1e59de40910 | |
| parent | 07bde79a5c355dbca66ca4318645aa17b4c0d859 (diff) | |
target: Make transport_lookup_cmd_lun() locking IRQ-safe
transport_lookup_cmd_lun() may be called from interrupt context (eg
tcm_loop_allocate_core_cmd() calls it, and it has a comment that says,
"Can be called from interrupt context"), so it needs to use
spin_lock_irqsave() instead of spin_lock_irq() to avoid enabling
interrupts at the wrong time.
(And indeed the last set of lock operations, on lun_cmd_lock, were
already using spin_lock_irqsave(), so we just need to fix the other
two locks we take)
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
| -rw-r--r-- | drivers/target/target_core_device.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index c674a5d7421..e25df3b813e 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -72,7 +72,7 @@ int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun) return -ENODEV; } - spin_lock_irq(&se_sess->se_node_acl->device_list_lock); + spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags); se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun]; if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) { struct se_dev_entry *deve = se_cmd->se_deve; @@ -88,7 +88,7 @@ int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun) " Access for 0x%08x\n", se_cmd->se_tfo->get_fabric_name(), unpacked_lun); - spin_unlock_irq(&se_sess->se_node_acl->device_list_lock); + spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags); return -EACCES; } @@ -106,7 +106,7 @@ int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun) se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev; se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; } - spin_unlock_irq(&se_sess->se_node_acl->device_list_lock); + spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags); if (!se_lun) { /* @@ -154,13 +154,13 @@ int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun) /* TODO: get rid of this and use atomics for stats */ dev = se_lun->lun_se_dev; - spin_lock_irq(&dev->stats_lock); + spin_lock_irqsave(&dev->stats_lock, flags); dev->num_cmds++; if (se_cmd->data_direction == DMA_TO_DEVICE) dev->write_bytes += se_cmd->data_length; else if (se_cmd->data_direction == DMA_FROM_DEVICE) dev->read_bytes += se_cmd->data_length; - spin_unlock_irq(&dev->stats_lock); + spin_unlock_irqrestore(&dev->stats_lock, flags); /* * Add the iscsi_cmd_t to the struct se_lun's cmd list. This list is used |