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[SCSI] target: Fix interrupt context bug with stats_lock and core_tmr_alloc_req 

This patch fixes two bugs wrt to the interrupt context usage of target
core with HW target mode drivers.  It first converts the usage of struct
se_device->stats_lock in transport_get_lun_for_cmd() and core_tmr_lun_reset()
to properly use spin_lock_irq() to address an BUG with CONFIG_LOCKDEP_SUPPORT=y
enabled.

This patch also adds a 'in_interrupt()' check to allow GFP_ATOMIC usage from
core_tmr_alloc_req() to fix a 'sleeping in interrupt context' BUG with HW
target fabrics that require this logic to function.

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <jbottomley@parallels.com>
This commit is contained in:
Nicholas Bellinger 2011-05-19 20:19:10 -07:00 committed by James Bottomley
parent 97868c8905
commit 53ab6709b4
2 changed files with 6 additions and 5 deletions
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4
drivers/target/target_core_device.c
View File

@ -150,13 +150,13 @@ out:
{
struct se_device *dev = se_lun->lun_se_dev;
spin_lock(&dev->stats_lock);
spin_lock_irq(&dev->stats_lock);
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(&dev->stats_lock);
spin_unlock_irq(&dev->stats_lock);
}
/*

7
drivers/target/target_core_tmr.c
View File

@ -55,7 +55,8 @@ struct se_tmr_req *core_tmr_alloc_req(
{
struct se_tmr_req *tmr;
tmr = kmem_cache_zalloc(se_tmr_req_cache, GFP_KERNEL);
tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
GFP_ATOMIC : GFP_KERNEL);
if (!(tmr)) {
printk(KERN_ERR "Unable to allocate struct se_tmr_req\n");
return ERR_PTR(-ENOMEM);
@ -398,9 +399,9 @@ int core_tmr_lun_reset(
printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n");
}
spin_lock(&dev->stats_lock);
spin_lock_irq(&dev->stats_lock);
dev->num_resets++;
spin_unlock(&dev->stats_lock);
spin_unlock_irq(&dev->stats_lock);
DEBUG_LR("LUN_RESET: %s for [%s] Complete\n",
(preempt_and_abort_list) ? "Preempt" : "TMR",