linux-kernel - [PATCH v4 1/3] PCI: altera-msi: Remove IRQ handler and data in one go

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Message-Id: <20210115212435.19940-1-martin@kaiser.cx>
Date:   Fri, 15 Jan 2021 22:24:33 +0100
From:   Martin Kaiser <martin@...ser.cx>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Toan Le <toan@...amperecomputing.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Kaiser <martin@...ser.cx>
Subject: [PATCH v4 1/3] PCI: altera-msi: Remove 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>
---
Hi Lorenzo,
here's another bunch of simple patches that were discussed in November.
Could you have a look?
Thanks,
Martin

v4:
 - resend after two months
 - capitalize the commit message properly
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-altera-msi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-altera-msi.c b/drivers/pci/controller/pcie-altera-msi.c
index e1636f7714ca..42691dd8ebef 100644
--- a/drivers/pci/controller/pcie-altera-msi.c
+++ b/drivers/pci/controller/pcie-altera-msi.c
@@ -204,8 +204,7 @@ static int altera_msi_remove(struct platform_device *pdev)
 	struct altera_msi *msi = platform_get_drvdata(pdev);
 
 	msi_writel(msi, 0, MSI_INTMASK);
-	irq_set_chained_handler(msi->irq, NULL);
-	irq_set_handler_data(msi->irq, NULL);
+	irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
 
 	altera_free_domains(msi);
 
-- 
2.20.1