[SCSI] target: Fix bug with task_sg chained transport_free_dev_tasks release

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This patch addresses a bug in the target core release path for HW
operation where transport_free_dev_tasks() was incorrectly being called
from transport_lun_remove_cmd() while releasing a se_cmd reference and
calling struct target_core_fabric_ops->queue_data_in().

This would result in a OOPs with HW target mode when the release of
se_task->task_sg[] would happen before pci_unmap_sg() can be called in
HW target mode fabric module code.  This patch addresses the issue by
moving transport_free_dev_tasks() from transport_lun_remove_cmd() into
transport_generic_free_cmd(), and adding TRANSPORT_FREE_CMD_INTR and
transport_generic_free_cmd_intr() to allow se_cmd descriptor release
to happen fromfrom within transport_processing_thread() process context
when release of se_cmd is not possible from HW interrupt context.

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <jbottomley@parallels.com>

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This commit is contained in:

Nicholas Bellinger 2011-05-19 20:19:11 -07:00

parent 1e7de68c57

commit 42c6951e2f

3 changed files with 14 additions and 1 deletions

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13

drivers/target/target_core_transport.c

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1

include/target/target_core_base.h

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1

include/target/target_core_transport.h

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