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

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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
parent 4a8fcc2cc3
commit 1e7de68c57
2 changed files with 6 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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);
}
/*