crypto: qat - do not handle PFVF sources for qat_4xxx

The QAT driver does not have support for PFVF interrupts for GEN4
devices, therefore report the vf2pf sources as 0.
This prevents a NULL pointer dereference in the function
adf_msix_isr_ae() if the device triggers a spurious interrupt.

Fixes: 993161d3 ("crypto: qat - fix handling of VF to PF interrupts")
Reported-by: Adam Guerin <adam.guerin@intel.com>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_4xxx/adf_4xxx_hw_data.c

@@ -211,6 +211,12 @@ static u32 uof_get_ae_mask(u32 obj_num)
 	return adf_4xxx_fw_config[obj_num].ae_mask;
 }
 
+static u32 get_vf2pf_sources(void __iomem *pmisc_addr)
+{
+	/* For the moment do not report vf2pf sources */
+	return 0;
+}
+
 void adf_init_hw_data_4xxx(struct adf_hw_device_data *hw_data)
 {
 	hw_data->dev_class = &adf_4xxx_class;
@@ -254,6 +260,7 @@ void adf_init_hw_data_4xxx(struct adf_hw_device_data *hw_data)
 	hw_data->set_msix_rttable = set_msix_default_rttable;
 	hw_data->set_ssm_wdtimer = adf_gen4_set_ssm_wdtimer;
 	hw_data->enable_pfvf_comms = pfvf_comms_disabled;
+	hw_data->get_vf2pf_sources = get_vf2pf_sources;
 	hw_data->disable_iov = adf_disable_sriov;
 	hw_data->min_iov_compat_ver = ADF_PFVF_COMPAT_THIS_VERSION;