add skiboot-5.1.21 release notes

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
(cherry picked from commit 7d64a8b4daa00a78e49493668ad4fd6789bfc883)
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/doc/release-notes/skiboot-5.1.21.rst b/doc/release-notes/skiboot-5.1.21.rst
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+skiboot-5.1.21
+--------------
+
+skiboot-5.1.21 was released on Tuesday 19th September 2017.
+
+skiboot-5.1.21 is the 22nd stable release of 5.1, it follows skiboot-5.1.20
+(which was released 18th August 2017).
+
+This release contains one backported bug fix to the 5.1.x series.
+
+Changes are:
+
+- FSP: Add check to detect FSP Reset/Reload inside fsp_sync_msg()
+
+  During FSP Reset/Reload we move outstanding MBOX messages from msgq to
+  rr_queue including inflight message (fsp_reset_cmdclass()). But we are not
+  resetting inflight message state.
+
+  In extreme corner case where we sent message to FSP via fsp_sync_msg() path
+  and FSP Reset/Reload happens before getting respose from FSP, then we will
+  endup waiting in fsp_sync_msg() until everything becomes normal.
+
+  This patch adds fsp_in_rr() check to fsp_sync_msg() and return error to caller
+  if FSP is in R/R.