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From 4baf16fc6d22fd948a597993d858d4de0c5b3bcc Mon Sep 17 00:00:00 2001
From: Annaliese McDermond <nh6z@nh6z.net>
Date: Fri, 21 Jun 2019 03:52:49 -0700
Subject: [PATCH 702/703] i2c: bcm2835: Move IRQ request after clock code in
probe
Commit 4a5cfa39465cad25dd736d7ceba8a5d32eea4ecc upstream.
If any of the clock code in the probe fails and returns, the IRQ
will not be freed. Moving the IRQ request to last allows it to
be freed on any errors further up in the probe function. devm_
calls can apparently not be used because there are some potential
race conditions that will arise.
Fixes: bebff81fb8b9 ("i2c: bcm2835: Model Divider in CCF")
Signed-off-by: Annaliese McDermond <nh6z@nh6z.net>
Acked-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---
drivers/i2c/busses/i2c-bcm2835.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c
@@ -521,20 +521,6 @@ static int bcm2835_i2c_probe(struct plat
if (IS_ERR(i2c_dev->regs))
return PTR_ERR(i2c_dev->regs);
- irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!irq) {
- dev_err(&pdev->dev, "No IRQ resource\n");
- return -ENODEV;
- }
- i2c_dev->irq = irq->start;
-
- ret = request_irq(i2c_dev->irq, bcm2835_i2c_isr, IRQF_SHARED,
- dev_name(&pdev->dev), i2c_dev);
- if (ret) {
- dev_err(&pdev->dev, "Could not request IRQ\n");
- return -ENODEV;
- }
-
mclk_name = of_clk_get_parent_name(pdev->dev.of_node, 0);
bus_clk = bcm2835_i2c_register_div(&pdev->dev, mclk_name, i2c_dev);
@@ -564,6 +550,20 @@ static int bcm2835_i2c_probe(struct plat
return ret;
}
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!irq) {
+ dev_err(&pdev->dev, "No IRQ resource\n");
+ return -ENODEV;
+ }
+ i2c_dev->irq = irq->start;
+
+ ret = request_irq(i2c_dev->irq, bcm2835_i2c_isr, IRQF_SHARED,
+ dev_name(&pdev->dev), i2c_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not request IRQ\n");
+ return -ENODEV;
+ }
+
adap = &i2c_dev->adapter;
i2c_set_adapdata(adap, i2c_dev);
adap->owner = THIS_MODULE;
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