| commit | fcfa060468a4edcf776f0c1211d826d5de1668c1 | [log] [tgz] |
|---|---|---|
| author | Neil Turton <nturton@solarflare.com> | Mon Apr 11 11:42:43 2011 +0100 |
| committer | Ben Hutchings <bhutchings@solarflare.com> | Tue Apr 12 23:52:44 2011 +0100 |
| tree | 3e8387932c5cc10facffa248ecfb648564a9ae5e | |
| parent | d4fabcc8e8ecac21262b1a5b9684fe415b128bd2 [diff] |
sfc: Use rmb() to ensure reads occur in order Enabling write-combining may also enable read reordering. The BIU is only guaranteed to read from a 128-bit CSR or 64-bit SRAM word when the host reads from its lowest address; otherwise the BIU may use the latched value. Therefore we need to reinstate the read memory barriers after the first read operation for each CSR or SRAM word. Signed-off-by; Ben Hutchings <bhutchings@solarflare.com>