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bnxt_en: Prevent kernel panic when receiving unexpected PHC_UPDATE event 

The firmware can send PHC_RTC_UPDATE async event on a PF that may not
have PTP registered. In such a case, there will be a null pointer
deference for bp->ptp_cfg when we try to handle the event.

Fix it by not registering for this event with the firmware if !bp->ptp_cfg.
Also, check that bp->ptp_cfg is valid before proceeding when we receive
the event.

Fixes: 8bcf6f04d4 ("bnxt_en: Handle async event when the PHC is updated in RTC mode")
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Pavan Chebbi 2023-06-07 00:54:08 -07:00 committed by Paolo Abeni
parent 83474a9b25
commit 319a7827df
2 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View File

@ -2365,6 +2365,9 @@ static int bnxt_async_event_process(struct bnxt *bp,
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
u64 ns;
if (!ptp)
goto async_event_process_exit;
spin_lock_bh(&ptp->ptp_lock);
bnxt_ptp_update_current_time(bp);
ns = (((u64)BNXT_EVENT_PHC_RTC_UPDATE(data1) <<
@ -4763,6 +4766,9 @@ int bnxt_hwrm_func_drv_rgtr(struct bnxt *bp, unsigned long *bmap, int bmap_size,
if (event_id == ASYNC_EVENT_CMPL_EVENT_ID_ERROR_RECOVERY &&
!(bp->fw_cap & BNXT_FW_CAP_ERROR_RECOVERY))
continue;
if (event_id == ASYNC_EVENT_CMPL_EVENT_ID_PHC_UPDATE &&
!bp->ptp_cfg)
continue;
__set_bit(bnxt_async_events_arr[i], async_events_bmap);
}
if (bmap && bmap_size) {

1
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
View File

@ -952,6 +952,7 @@ int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg)
bnxt_ptp_timecounter_init(bp, true);
bnxt_ptp_adjfine_rtc(bp, 0);
}
bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true);
ptp->ptp_info = bnxt_ptp_caps;
if ((bp->fw_cap & BNXT_FW_CAP_PTP_PPS)) {