diff mbox series

[4/5] crypto: qat - ensure correct order in VF restarting handler

Message ID 20240717114544.364892-5-michal.witwicki@intel.com
State New
Headers show
Series crypto: qat - Disable VFs through a sysfs interface | expand

Commit Message

Michal Witwicki July 17, 2024, 11:44 a.m. UTC 
In the process of sending the ADF_PF2VF_MSGTYPE_RESTARTING message to
Virtual Functions (VFs), the Physical Function (PF) should set the
`vf->restarting` flag to true before dispatching the message.
This change is necessary to prevent a race condition where the handling
of the ADF_VF2PF_MSGTYPE_RESTARTING_COMPLETE message (which sets the
`vf->restarting` flag to false) runs immediately after the message is sent,
but before the flag is set to true.

Set the `vf->restarting` to true before sending the message
ADF_PF2VF_MSGTYPE_RESTARTING, if supported by the version of the
protocol and if the VF is started.

Fixes: ec26f8e6c784 ("crypto: qat - update PFVF protocol for recovery")
Signed-off-by: Michal Witwicki <michal.witwicki@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
 drivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c b/drivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c
index 0e31f4b41844..0cee3b23dee9 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_pfvf_pf_msg.c
@@ -18,14 +18,17 @@  void adf_pf2vf_notify_restarting(struct adf_accel_dev *accel_dev)
 
 	dev_dbg(&GET_DEV(accel_dev), "pf2vf notify restarting\n");
 	for (i = 0, vf = accel_dev->pf.vf_info; i < num_vfs; i++, vf++) {
-		vf->restarting = false;
+		if (vf->init && vf->vf_compat_ver >= ADF_PFVF_COMPAT_FALLBACK)
+			vf->restarting = true;
+		else
+			vf->restarting = false;
+
 		if (!vf->init)
 			continue;
+
 		if (adf_send_pf2vf_msg(accel_dev, i, msg))
 			dev_err(&GET_DEV(accel_dev),
 				"Failed to send restarting msg to VF%d\n", i);
-		else if (vf->vf_compat_ver >= ADF_PFVF_COMPAT_FALLBACK)
-			vf->restarting = true;
 	}
 }