From de97a21a23dda34f1754a748560dede139e6bfc2 Mon Sep 17 00:00:00 2001 From: Feng Tang Date: Thu, 7 Apr 2011 09:39:44 +0800 Subject: [PATCH] rtc, x86/mrst/vrtc: Fix boot crash in rtc_read_alarm() Commit f44f7f96a20 ("RTC: Initialize kernel state from RTC") caused a boot regression on the MRST platform. The reason is that rtc_device_register() calls rtc_read_alarm() after that change, which function does not have all driver data set up yet. The rtc-mrst driver needs to call dev_set_drvdata() before rtc_device_register() gets called. Signed-off-by: Feng Tang Signed-off-by: Alan Cox Acked-by: John Stultz Cc: Alessandro Zummo Cc: Linus Torvalds Link: http://lkml.kernel.org/r/1302140384-27571-1-git-send-email-feng.tang@intel.com Signed-off-by: Ingo Molnar --- drivers/rtc/rtc-mrst.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/rtc/rtc-mrst.c b/drivers/rtc/rtc-mrst.c index 332a2c4a891c..b2f096871a97 100644 --- a/drivers/rtc/rtc-mrst.c +++ b/drivers/rtc/rtc-mrst.c @@ -342,6 +342,8 @@ vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, int rtc_irq) mrst_rtc.irq = rtc_irq; mrst_rtc.iomem = iomem; + mrst_rtc.dev = dev; + dev_set_drvdata(dev, &mrst_rtc); mrst_rtc.rtc = rtc_device_register(driver_name, dev, &mrst_rtc_ops, THIS_MODULE); @@ -350,8 +352,6 @@ vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, int rtc_irq) goto cleanup0; } - mrst_rtc.dev = dev; - dev_set_drvdata(dev, &mrst_rtc); rename_region(iomem, dev_name(&mrst_rtc.rtc->dev)); spin_lock_irq(&rtc_lock); @@ -376,9 +376,10 @@ vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, int rtc_irq) return 0; cleanup1: - mrst_rtc.dev = NULL; rtc_device_unregister(mrst_rtc.rtc); cleanup0: + dev_set_drvdata(dev, NULL); + mrst_rtc.dev = NULL; release_region(iomem->start, iomem->end + 1 - iomem->start); dev_err(dev, "rtc-mrst: unable to initialise\n"); return retval; -- 2.30.2