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i40e: expand comment

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Explain why we cannot remove this code, even though it works differently
than any of our other interrupt cause handling code.

Change-ID: Ie66203bd037a466066036611c31d44f759ec5176
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams 2016-01-15 14:33:17 -08:00 committed by Jeff Kirsher
parent a16ae2d59c
commit 0d79032781
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
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@ -2037,7 +2037,11 @@ int i40e_vc_process_vflr_event(struct i40e_pf *pf)
if (!test_bit(__I40E_VFLR_EVENT_PENDING, &pf->state))
return 0;
/* re-enable vflr interrupt cause */
/* Re-enable the VFLR interrupt cause here, before looking for which
* VF got reset. Otherwise, if another VF gets a reset while the
* first one is being processed, that interrupt will be lost, and
* that VF will be stuck in reset forever.
*/
reg = rd32(hw, I40E_PFINT_ICR0_ENA);
reg |= I40E_PFINT_ICR0_ENA_VFLR_MASK;
wr32(hw, I40E_PFINT_ICR0_ENA, reg);