crypto: qat - force an edge when re-enabling all VF2PF interrupts

VF2PF interrupts are edge-triggered: a source only fires on a
masked -> unmasked transition of VM2PF_MSK, not by being unmasked.
adf_enable_all_vf2pf_interrupts() does a plain read-modify-write
unmask, assuming VM2PF_MSK still holds the all-masked value left by
adf_disable_all_vf2pf_interrupts().

That breaks across a device reset: adf_dev_autoreset() (and AER
recovery) FLR the PF while VFs stay alive, so a VF can latch a source
in VM2PF_SOU with no vectors set up to deliver it. The FLR then resets
VM2PF_MSK to its power-on default of 0 (unmasked) without a software
write, so the following RMW unmask writes 0 over an already-0
register: no edge occurs and the latched VF2PF message is never
delivered.

Fix by having adf_enable_all_vf2pf_interrupts() mask all sources
immediately before unmasking them, mirroring the idiom already used in
adf_gen4_disable_pending_vf2pf_interrupts(), forcing the required edge
regardless of the prior state of VM2PF_MSK.

Fixes: 575185000539 ("crypto: qat - keep VFs enabled during reset")
Signed-off-by: George Abraham P <george.abraham.p@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

0 files changed, 0 insertions, 0 deletions