linux-kernel - [PATCH 4.9 13/43] PCI/MSI: Correct misleading comments

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Message-Id: <20210824170614.710813-14-sashal@kernel.org>
Date:   Tue, 24 Aug 2021 13:05:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4.9 13/43] PCI/MSI: Correct misleading comments

From: Thomas Gleixner <tglx@...utronix.de>

commit 689e6b5351573c38ccf92a0dd8b3e2c2241e4aff upstream.

The comments about preserving the cached state in pci_msi[x]_shutdown() are
misleading as the MSI descriptors are freed right after those functions
return. So there is nothing to restore. Preparatory change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Marc Zyngier <maz@...nel.org>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20210729222542.621609423@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/msi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index ebbd72f53e45..481f1a1884e6 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -919,7 +919,6 @@ void pci_msi_shutdown(struct pci_dev *dev)
 
 	/* Return the device with MSI unmasked as initial states */
 	mask = msi_mask(desc->msi_attrib.multi_cap);
-	/* Keep cached state to be restored */
 	__pci_msi_desc_mask_irq(desc, mask, 0);
 
 	/* Restore dev->irq to its default pin-assertion irq */
@@ -1021,10 +1020,8 @@ void pci_msix_shutdown(struct pci_dev *dev)
 		return;
 
 	/* Return the device with MSI-X masked as initial states */
-	for_each_pci_msi_entry(entry, dev) {
-		/* Keep cached states to be restored */
+	for_each_pci_msi_entry(entry, dev)
 		__pci_msix_desc_mask_irq(entry, 1);
-	}
 
 	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
 	pci_intx_for_msi(dev, 1);
-- 
2.30.2