bnxt_en: Fix PTP capability discovery

The current PTP initialization logic does not account for firmware
reset that may cause PTP capability to change.  The valid pointer
bp->ptp_cfg is used to indicate that the device is capable of PTP
and that it has been initialized.  So we must clean up bp->ptp_cfg
and free it if the firmware after reset does not support PTP.

Fixes: 93cb62d98e9c ("bnxt_en: Enable hardware PTP support")
Cc: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index b8b73c2..4db162c 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7574,8 +7574,12 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
                bp->flags &= ~BNXT_FLAG_WOL_CAP;
                if (flags & FUNC_QCAPS_RESP_FLAGS_WOL_MAGICPKT_SUPPORTED)
                        bp->flags |= BNXT_FLAG_WOL_CAP;
-               if (flags & FUNC_QCAPS_RESP_FLAGS_PTP_SUPPORTED)
+               if (flags & FUNC_QCAPS_RESP_FLAGS_PTP_SUPPORTED) {
                        __bnxt_hwrm_ptp_qcfg(bp);
+               } else {
+                       kfree(bp->ptp_cfg);
+                       bp->ptp_cfg = NULL;
+               }
        } else {
 #ifdef CONFIG_BNXT_SRIOV
                struct bnxt_vf_info *vf = &bp->vf;