Commit 996422e3 authored by Jacob Keller's avatar Jacob Keller Committed by Jakub Kicinski

ice: Don't process extts if PTP is disabled

The ice_ptp_extts_event() function can race with ice_ptp_release() and
result in a NULL pointer dereference which leads to a kernel panic.

Panic occurs because the ice_ptp_extts_event() function calls
ptp_clock_event() with a NULL pointer. The ice driver has already
released the PTP clock by the time the interrupt for the next external
timestamp event occurs.

To fix this, modify the ice_ptp_extts_event() function to check the
PTP state and bail early if PTP is not ready.

Fixes: 172db5f9 ("ice: add support for auxiliary input/output pins")
Reviewed-by: default avatarPrzemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: default avatarKarol Kolacinski <karol.kolacinski@intel.com>
Reviewed-by: default avatarSimon Horman <horms@kernel.org>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20240702171459.2606611-3-anthony.l.nguyen@intel.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 00d3b4f5
......@@ -1559,6 +1559,10 @@ void ice_ptp_extts_event(struct ice_pf *pf)
u8 chan, tmr_idx;
u32 hi, lo;
/* Don't process timestamp events if PTP is not ready */
if (pf->ptp.state != ICE_PTP_READY)
return;
tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
/* Event time is captured by one of the two matched registers
* GLTSYN_EVNT_L: 32 LSB of sampled time event
......
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