linux-kernel - [PATCH 4.14 140/159] i40e: fix client notify of VF reset

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Date:   Fri, 22 Dec 2017 09:47:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alan Brady <alan.brady@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 140/159] i40e: fix client notify of VF reset

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alan Brady <alan.brady@...el.com>

[ Upstream commit c53d11f669c0e7d0daf46a717b6712ad0b09de99 ]

Currently there is a bug in which the PF driver fails to inform clients
of a VF reset which then causes clients to leak resources.  The bug
exists because we were incorrectly checking the I40E_VF_STATE_PRE_ENABLE
bit.

When a VF is first init we go through a reset to initialize variables
and allocate resources but we don't want to inform clients of this first
reset since the client isn't fully enabled yet so we set a state bit
signifying we're in a "pre-enabled" client state.  During the first
reset we should be clearing the bit, allowing all following resets to
notify the client of the reset when the bit is not set.  This patch
fixes the issue by negating the 'test_and_clear_bit' check to accurately
reflect the behavior we want.

Signed-off-by: Alan Brady <alan.brady@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -1008,8 +1008,8 @@ static void i40e_cleanup_reset_vf(struct
 		set_bit(I40E_VF_STATE_ACTIVE, &vf->vf_states);
 		clear_bit(I40E_VF_STATE_DISABLED, &vf->vf_states);
 		/* Do not notify the client during VF init */
-		if (test_and_clear_bit(I40E_VF_STATE_PRE_ENABLE,
-				       &vf->vf_states))
+		if (!test_and_clear_bit(I40E_VF_STATE_PRE_ENABLE,
+					&vf->vf_states))
 			i40e_notify_client_of_vf_reset(pf, abs_vf_id);
 		vf->num_vlan = 0;
 	}