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authorMike Christie <michaelc@cs.wisc.edu>2006-05-30 00:37:28 -0500
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-06-05 19:12:25 -0400
commit3219e5294150aee7d389e19029f49b44fb6b5c9f (patch)
tree44236fd9f2eb40d5622cadb126e9f2672b129486 /include/scsi/scsi_transport_iscsi.h
parent040515f53c09047c76ad074dc6a280984dc84b04 (diff)
[SCSI] iscsi: fix writepsace race
We can race and misset the suspend bit if iscsi_write_space is called then iscsi_send returns with a failure indicating there is no space. To handle this this patch returns a error upwards allowing xmitworker to decide if we need to try and transmit again. For the no write space case xmitworker will not retry, and instead let iscsi_write_space queue it back up if needed (this relies on the work queue code to properly requeue us if needed). Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'include/scsi/scsi_transport_iscsi.h')
-rw-r--r--include/scsi/scsi_transport_iscsi.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 92129b97d31e..b684426a5900 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -57,8 +57,12 @@ struct iscsi_mgmt_task;
* Called from queuecommand with session lock held.
* @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs.
* Called from iscsi_conn_send_generic with xmitmutex.
- * @xmit_cmd_task: requests LLD to transfer cmd task
- * @xmit_mgmt_task: requests LLD to transfer mgmt task
+ * @xmit_cmd_task: Requests LLD to transfer cmd task. Returns 0 or the
+ * the number of bytes transferred on success, and -Exyz
+ * value on error.
+ * @xmit_mgmt_task: Requests LLD to transfer mgmt task. Returns 0 or the
+ * the number of bytes transferred on success, and -Exyz
+ * value on error.
* @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex
* and session->lock after the connection has been
* suspended and terminated during recovery. If called