Author: arybchik
Date: Fri Jan 6 07:27:40 2017
New Revision: 311492
URL: https://svnweb.freebsd.org/changeset/base/311492
Log:
MFC r310750
sfxge(4): add missing barrier in common code MCDI response handling
The semantics of the MCDI interfacve require reading the first
dword of the header before any other data in the buffer. Add
a barrier to the common code MCDI handler to enforce this.
Submitted by: Andy Moreton <amoreton at solarflare.com>
Sponsored by: Solarflare Communications, Inc.
Modified:
stable/10/sys/dev/sfxge/common/ef10_mcdi.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/sfxge/common/ef10_mcdi.c
==============================================================================
--- stable/10/sys/dev/sfxge/common/ef10_mcdi.c Fri Jan 6 07:27:07 2017
(r311491)
+++ stable/10/sys/dev/sfxge/common/ef10_mcdi.c Fri Jan 6 07:27:40 2017
(r311492)
@@ -159,6 +159,8 @@ ef10_mcdi_poll_response(
efx_dword_t hdr;
EFSYS_MEM_READD(esmp, 0, &hdr);
+ EFSYS_MEM_READ_BARRIER();
+
return (EFX_DWORD_FIELD(hdr, MCDI_HEADER_RESPONSE) ? B_TRUE : B_FALSE);
}
_______________________________________________
svn-src-stable-10@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-stable-10
To unsubscribe, send any mail to "svn-src-stable-10-unsubscr...@freebsd.org"
