FAILED: patch "[PATCH] ice: rearm other interrupt cause register after enabling VFs" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 2657e16d8c52fb6ffc7250b0b6536f93886e32d6 Mon Sep 17 00:00:00 2001
From: Paul Greenwalt <paul.greenwalt@intel.com>
Date: Mon, 12 Jul 2021 07:54:25 -0400
Subject: [PATCH] ice: rearm other interrupt cause register after enabling VFs

The other interrupt cause register (OICR), global interrupt 0, is
disabled when enabling VFs to prevent handling VFLR. If the OICR is
not rearmed then the VF cannot communicate with the PF.

Rearm the OICR after enabling VFs.

Fixes: 916c7fdf5e93 ("ice: Separate VF VSI initialization/creation from reset flow")
Signed-off-by: Paul Greenwalt <paul.greenwalt@intel.com>
Tested-by: Tony Brelinski <tony.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
index c2431bc9d9ce..6427e7ec93de 100644
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
@@ -2023,6 +2023,10 @@ static int ice_ena_vfs(struct ice_pf *pf, u16 num_vfs)
 	if (ret)
 		goto err_unroll_sriov;
 
+	/* rearm global interrupts */
+	if (test_and_clear_bit(ICE_OICR_INTR_DIS, pf->state))
+		ice_irq_dynamic_ena(hw, NULL, NULL);
+
 	return 0;
 
 err_unroll_sriov: