Imported linux-2.6.27.39 suse/xen patches.

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.arch / s390-15-04-zfcp-unchained-sbals.patch

diff --git a/src/patches/suse-2.6.27.31/patches.arch/s390-15-04-zfcp-unchained-sbals.patch b/src/patches/suse-2.6.27.31/patches.arch/s390-15-04-zfcp-unchained-sbals.patch
deleted file mode 100644 (file)
index 2b048c3..0000000
--- a/src/patches/suse-2.6.27.31/patches.arch/s390-15-04-zfcp-unchained-sbals.patch
+++ /dev/null
@@ -1,72 +0,0 @@
-From: Gerald Schaefer <geraldsc@de.ibm.com>
-Subject: zfcp: Use only single SBAL commands from recovery
-References: bnc#518291,LTC#54462
-
-Symptom:     Issuing an ELS request might not detect a stalled
-             outbound queue
-Problem:     zfcp uses chained SBALs for ELS requests leading to the
-             situation that the ELS request gets one free SBAL, but
-             not the following ones. In this situation the ELS request
-             fails but does not trigger the error handling for the
-             stalled queue.
-Solution:    Use unchained SBALs where possible, especially for
-             commands from the erp. This guarantees that each erp
-             command will get the required SBAL or trigger queue
-             recovery.
-
-Acked-by: John Jolly <jjolly@suse.de>
----
- drivers/s390/scsi/zfcp_fsf.c |   33 +++++++++++++++++++++++++--------
- 1 file changed, 25 insertions(+), 8 deletions(-)
-
---- a/drivers/s390/scsi/zfcp_fsf.c     2009-07-01 12:26:28.000000000 +0200
-+++ b/drivers/s390/scsi/zfcp_fsf.c     2009-07-01 12:28:43.000000000 +0200
-@@ -1012,6 +1012,23 @@ skip_fsfstatus:
-               send_ct->handler(send_ct->handler_data);
- }
- 
-+static void zfcp_fsf_setup_ct_els_unchained(struct qdio_buffer_element *sbale,
-+                                          struct scatterlist *sg_req,
-+                                          struct scatterlist *sg_resp)
-+{
-+      sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
-+      sbale[2].addr   = sg_virt(sg_req);
-+      sbale[2].length = sg_req->length;
-+      sbale[3].addr   = sg_virt(sg_resp);
-+      sbale[3].length = sg_resp->length;
-+      sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
-+}
-+
-+static int zfcp_fsf_one_sbal(struct scatterlist *sg)
-+{
-+       return sg_is_last(sg) && sg->length <= PAGE_SIZE;
-+}
-+
- static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
-                                      struct scatterlist *sg_req,
-                                      struct scatterlist *sg_resp,
-@@ -1022,16 +1039,16 @@ static int zfcp_fsf_setup_ct_els_sbals(s
-       int bytes;
- 
-       if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
--              if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
--                  !sg_is_last(sg_req) || !sg_is_last(sg_resp))
-+              if (!zfcp_fsf_one_sbal(sg_req) || !zfcp_fsf_one_sbal(sg_resp))
-                       return -EOPNOTSUPP;
- 
--              sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
--              sbale[2].addr   = sg_virt(sg_req);
--              sbale[2].length = sg_req->length;
--              sbale[3].addr   = sg_virt(sg_resp);
--              sbale[3].length = sg_resp->length;
--              sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
-+              zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
-+              return 0;
-+      }
-+
-+      /* use single, unchained SBAL if it can hold the request */
-+      if (zfcp_fsf_one_sbal(sg_req) && zfcp_fsf_one_sbal(sg_resp)) {
-+              zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
-               return 0;
-       }
-