linux-kernel - [PATCH v4] PCI: brcmstb: Remove chained IRQ handler and data in one go

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Date:   Fri, 15 Jan 2021 22:15:32 +0100
From:   Martin Kaiser <martin@...ser.cx>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Martin Kaiser <martin@...ser.cx>
Subject: [PATCH v4] PCI: brcmstb: Remove chained IRQ handler and data in one go

Call irq_set_chained_handler_and_data() to clear the chained handler
and the handler's data under irq_desc->lock.

See also 2cf5a03cb29d ("PCI/keystone: Fix race in installing chained
IRQ handler").

Signed-off-by: Martin Kaiser <martin@...ser.cx>
Acked-by: Florian Fainelli <f.fainelli@...il.com>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
Hi Lorenzo,
I sent this simple patch back in November, it seems that it got lost
somehow. Is there any chance that you can apply it?
Thanks, Martin

v4:
 - resend after two months
 - clean up the commit message while at it
v3:
 - rewrite the commit message again. this is no race condition if we
   remove the interrupt handler. sorry for the noise.
v2:
 - rewrite the commit message to clarify that this is a bugfix

 drivers/pci/controller/pcie-brcmstb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index d41257f43a8f..95f6dd93ceae 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -603,8 +603,7 @@ static void brcm_msi_remove(struct brcm_pcie *pcie)
 
 	if (!msi)
 		return;
-	irq_set_chained_handler(msi->irq, NULL);
-	irq_set_handler_data(msi->irq, NULL);
+	irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
 	brcm_free_domains(msi);
 }
 
-- 
2.20.1