4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ganesh Goudar <ganes...@chelsio.com>


[ Upstream commit a97051f4553551d13e586ab3cb6ae13093a44a81 ]

take care of UpDbgLaRdPtr[0-3] restriction for T6.

Signed-off-by: Ganesh Goudar <ganes...@chelsio.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/chelsio/cxgb4/t4_hw.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -8088,7 +8088,16 @@ int t4_cim_read_la(struct adapter *adap,
                ret = t4_cim_read(adap, UP_UP_DBG_LA_DATA_A, 1, &la_buf[i]);
                if (ret)
                        break;
-               idx = (idx + 1) & UPDBGLARDPTR_M;
+
+               /* Bits 0-3 of UpDbgLaRdPtr can be between 0000 to 1001 to
+                * identify the 32-bit portion of the full 312-bit data
+                */
+               if (is_t6(adap->params.chip) && (idx & 0xf) >= 9)
+                       idx = (idx & 0xff0) + 0x10;
+               else
+                       idx++;
+               /* address can't exceed 0xfff */
+               idx &= UPDBGLARDPTR_M;
        }
 restart:
        if (cfg & UPDBGLAEN_F) {


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