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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-05-31 11:56:42 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-05-31 23:02:11 +0200 |
| commit | a2ae8323a8e2c5668ae42493d925da1d68ff0324 (patch) | |
| tree | d423ff31f0615f0b5758d0bf211b6fe5ae859852 /drivers/rtc | |
| parent | a0defd7cfc2804796144545e00aaf74a486adbe7 (diff) | |
| download | linux-a2ae8323a8e2c5668ae42493d925da1d68ff0324.tar.bz2 | |
rtc: ds1685: fix possible race condition
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-ds1685.c | 41 |
1 files changed, 18 insertions, 23 deletions
diff --git a/drivers/rtc/rtc-ds1685.c b/drivers/rtc/rtc-ds1685.c index f0f8011dce3d..e6390475380f 100644 --- a/drivers/rtc/rtc-ds1685.c +++ b/drivers/rtc/rtc-ds1685.c @@ -2037,6 +2037,22 @@ ds1685_rtc_probe(struct platform_device *pdev) rtc->write(rtc, RTC_EXT_CTRL_4B, (rtc->read(rtc, RTC_EXT_CTRL_4B) | RTC_CTRL_4B_KSE)); + rtc_dev = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(rtc_dev)) + return PTR_ERR(rtc_dev); + + rtc_dev->ops = &ds1685_rtc_ops; + + /* Maximum periodic rate is 8192Hz (0.122070ms). */ + rtc_dev->max_user_freq = RTC_MAX_USER_FREQ; + + /* See if the platform doesn't support UIE. */ + if (pdata->uie_unsupported) + rtc_dev->uie_unsupported = 1; + rtc->uie_unsupported = pdata->uie_unsupported; + + rtc->dev = rtc_dev; + /* * Fetch the IRQ and setup the interrupt handler. * @@ -2069,32 +2085,13 @@ ds1685_rtc_probe(struct platform_device *pdev) /* Setup complete. */ ds1685_rtc_switch_to_bank0(rtc); - /* Register the device as an RTC. */ - rtc_dev = rtc_device_register(pdev->name, &pdev->dev, - &ds1685_rtc_ops, THIS_MODULE); - - /* Success? */ - if (IS_ERR(rtc_dev)) - return PTR_ERR(rtc_dev); - - /* Maximum periodic rate is 8192Hz (0.122070ms). */ - rtc_dev->max_user_freq = RTC_MAX_USER_FREQ; - - /* See if the platform doesn't support UIE. */ - if (pdata->uie_unsupported) - rtc_dev->uie_unsupported = 1; - rtc->uie_unsupported = pdata->uie_unsupported; - - rtc->dev = rtc_dev; - #ifdef CONFIG_SYSFS ret = ds1685_rtc_sysfs_register(&pdev->dev); if (ret) - rtc_device_unregister(rtc->dev); + return ret; #endif - /* Done! */ - return ret; + return rtc_register_device(rtc_dev); } /** @@ -2110,8 +2107,6 @@ ds1685_rtc_remove(struct platform_device *pdev) ds1685_rtc_sysfs_unregister(&pdev->dev); #endif - rtc_device_unregister(rtc->dev); - /* Read Ctrl B and clear PIE/AIE/UIE. */ rtc->write(rtc, RTC_CTRL_B, (rtc->read(rtc, RTC_CTRL_B) & |