bnxt_en: Fix RTNL lock usage on bnxt_update_link().
bnxt_update_link() is called from multiple code paths. Most callers, such as open, ethtool, already hold RTNL. Only the caller bnxt_sp_task() does not. So it is a bug to take RTNL inside bnxt_update_link(). Fix it by removing the RTNL inside bnxt_update_link(). The function now expects the caller to always hold RTNL. In bnxt_sp_task(), call bnxt_rtnl_lock_sp() before calling bnxt_update_link(). We also need to move the call to the end of bnxt_sp_task() since it will be clearing the BNXT_STATE_IN_SP_TASK bit. Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -5314,17 +5314,12 @@ static int bnxt_update_link(struct bnxt *bp, bool chng_link_state)
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if ((link_info->support_auto_speeds | diff) !=
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if ((link_info->support_auto_speeds | diff) !=
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link_info->support_auto_speeds) {
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link_info->support_auto_speeds) {
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/* An advertised speed is no longer supported, so we need to
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/* An advertised speed is no longer supported, so we need to
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* update the advertisement settings. See bnxt_reset() for
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* update the advertisement settings. Caller holds RTNL
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* comments about the rtnl_lock() sequence below.
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* so we can modify link settings.
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*/
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*/
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clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
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rtnl_lock();
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link_info->advertising = link_info->support_auto_speeds;
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link_info->advertising = link_info->support_auto_speeds;
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if (test_bit(BNXT_STATE_OPEN, &bp->state) &&
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if (link_info->autoneg & BNXT_AUTONEG_SPEED)
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(link_info->autoneg & BNXT_AUTONEG_SPEED))
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bnxt_hwrm_set_link_setting(bp, true, false);
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bnxt_hwrm_set_link_setting(bp, true, false);
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set_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
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rtnl_unlock();
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}
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}
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return 0;
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return 0;
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}
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}
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@ -6231,7 +6226,6 @@ static void bnxt_cfg_ntp_filters(struct bnxt *);
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static void bnxt_sp_task(struct work_struct *work)
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static void bnxt_sp_task(struct work_struct *work)
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{
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{
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struct bnxt *bp = container_of(work, struct bnxt, sp_task);
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struct bnxt *bp = container_of(work, struct bnxt, sp_task);
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int rc;
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set_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
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set_bit(BNXT_STATE_IN_SP_TASK, &bp->state);
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smp_mb__after_atomic();
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smp_mb__after_atomic();
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@ -6245,16 +6239,6 @@ static void bnxt_sp_task(struct work_struct *work)
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if (test_and_clear_bit(BNXT_RX_NTP_FLTR_SP_EVENT, &bp->sp_event))
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if (test_and_clear_bit(BNXT_RX_NTP_FLTR_SP_EVENT, &bp->sp_event))
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bnxt_cfg_ntp_filters(bp);
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bnxt_cfg_ntp_filters(bp);
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if (test_and_clear_bit(BNXT_LINK_CHNG_SP_EVENT, &bp->sp_event)) {
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if (test_and_clear_bit(BNXT_LINK_SPEED_CHNG_SP_EVENT,
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&bp->sp_event))
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bnxt_hwrm_phy_qcaps(bp);
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rc = bnxt_update_link(bp, true);
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if (rc)
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netdev_err(bp->dev, "SP task can't update link (rc: %x)\n",
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rc);
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}
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if (test_and_clear_bit(BNXT_HWRM_EXEC_FWD_REQ_SP_EVENT, &bp->sp_event))
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if (test_and_clear_bit(BNXT_HWRM_EXEC_FWD_REQ_SP_EVENT, &bp->sp_event))
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bnxt_hwrm_exec_fwd_req(bp);
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bnxt_hwrm_exec_fwd_req(bp);
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if (test_and_clear_bit(BNXT_VXLAN_ADD_PORT_SP_EVENT, &bp->sp_event)) {
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if (test_and_clear_bit(BNXT_VXLAN_ADD_PORT_SP_EVENT, &bp->sp_event)) {
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@ -6284,6 +6268,21 @@ static void bnxt_sp_task(struct work_struct *work)
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/* These functions below will clear BNXT_STATE_IN_SP_TASK. They
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/* These functions below will clear BNXT_STATE_IN_SP_TASK. They
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* must be the last functions to be called before exiting.
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* must be the last functions to be called before exiting.
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*/
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*/
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if (test_and_clear_bit(BNXT_LINK_CHNG_SP_EVENT, &bp->sp_event)) {
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int rc = 0;
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if (test_and_clear_bit(BNXT_LINK_SPEED_CHNG_SP_EVENT,
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&bp->sp_event))
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bnxt_hwrm_phy_qcaps(bp);
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bnxt_rtnl_lock_sp(bp);
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if (test_bit(BNXT_STATE_OPEN, &bp->state))
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rc = bnxt_update_link(bp, true);
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bnxt_rtnl_unlock_sp(bp);
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if (rc)
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netdev_err(bp->dev, "SP task can't update link (rc: %x)\n",
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rc);
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}
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if (test_and_clear_bit(BNXT_RESET_TASK_SP_EVENT, &bp->sp_event))
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if (test_and_clear_bit(BNXT_RESET_TASK_SP_EVENT, &bp->sp_event))
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bnxt_reset(bp, false);
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bnxt_reset(bp, false);
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