qed: Clear dcbx memory buffers before the usage.

This patch takes care of clearing the uninitialized buffer before using it.
1. pfc pri-enable bitmap need to be cleared before setting the requested
   enable bits. Without this, the un-touched values will be merged with
   requested values and sent to MFW.
2. The data in app-entry field need to be cleared before using it.
3. Clear the output data buffer used in qed_dcbx_query_params().

Signed-off-by: Sudarsana Reddy Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qlogic/qed/qed_dcbx.c b/drivers/net/ethernet/qlogic/qed/qed_dcbx.c
index 192a886..ad023fe 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_dcbx.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_dcbx.c
@@ -988,6 +988,7 @@ qed_dcbx_set_pfc_data(struct qed_hwfn *p_hwfn,
                if (p_params->pfc.prio[i])
                        pfc_map |= BIT(i);
 
+       *pfc &= ~DCBX_PFC_PRI_EN_BITMAP_MASK;
        *pfc |= (pfc_map << DCBX_PFC_PRI_EN_BITMAP_SHIFT);
 
        DP_VERBOSE(p_hwfn, QED_MSG_DCB, "pfc = 0x%x\n", *pfc);
@@ -1062,6 +1063,7 @@ qed_dcbx_set_app_data(struct qed_hwfn *p_hwfn,
 
        for (i = 0; i < DCBX_MAX_APP_PROTOCOL; i++) {
                entry = &p_app->app_pri_tbl[i].entry;
+               *entry = 0;
                if (ieee) {
                        *entry &= ~(DCBX_APP_SF_IEEE_MASK | DCBX_APP_SF_MASK);
                        switch (p_params->app_entry[i].sf_ieee) {
@@ -1193,6 +1195,7 @@ int qed_dcbx_get_config_params(struct qed_hwfn *p_hwfn,
                return -ENOMEM;
        }
 
+       memset(dcbx_info, 0, sizeof(*dcbx_info));
        rc = qed_dcbx_query_params(p_hwfn, dcbx_info, QED_DCBX_OPERATIONAL_MIB);
        if (rc) {
                kfree(dcbx_info);
@@ -1230,6 +1233,7 @@ static struct qed_dcbx_get *qed_dcbnl_get_dcbx(struct qed_hwfn *hwfn,
                return NULL;
        }
 
+       memset(dcbx_info, 0, sizeof(*dcbx_info));
        if (qed_dcbx_query_params(hwfn, dcbx_info, type)) {
                kfree(dcbx_info);
                return NULL;