On Monday, January 17, 2011, Jeff Chua wrote: > I've just tried the recent linux git pull > (e78bf5e6cbe837daa6ab628a5f679548742994d3) and suspend-to-memory > works, but resume takes a very long time (30 seconds doing nothing). > > Bisected and it says first bad commit is > ca9b600be38c73b7d25acfb8b7e4e9a9e941d881 Hmm. That's probably because acpi_os_unmap_memory() does the synchronize_rcu(), but I have no idea why it might cause a problem to occur in suspend_nvs_free(). What happens if you replace the acpi_os_map_memory() in suspend_nvs_save() with ioremap_cache() and the acpi_os_unmap_memory() in suspend_nvs_free() with iounmap() ? Rafael > commit ca9b600be38c73b7d25acfb8b7e4e9a9e941d881 > Author: Rafael J. Wysocki <rjw@xxxxxxx> > Date: Fri Jan 7 01:45:58 2011 +0100 > > ACPI / PM: Make suspend_nvs_save() use acpi_os_map_memory() > > It turns out that the NVS memory region that suspend_nvs_save() > attempts to map has been already mapped by acpi_os_map_memory(), so > suspend_nvs_save() should better use acpi_os_map_memory() for mapping > memory to avoid conflicts. > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> > Signed-off-by: Len Brown <len.brown@xxxxxxxxx> > > > I reverted the following commits, and system resumes without waiting ... > > commit ca9b600be38c73b7d25acfb8b7e4e9a9e941d881 > Author: Rafael J. Wysocki <rjw@xxxxxxx> > Date: Fri Jan 7 01:45:58 2011 +0100 > > ACPI / PM: Make suspend_nvs_save() use acpi_os_map_memory() > > commit 6d5bbf00d251cc73223a71422d69e069dc2e0b8d > Author: Len Brown <len.brown@xxxxxxxxx> > Date: Fri Jan 7 01:46:40 2011 +0100 > > ACPI: Use ioremap_cache() > > commit d146df18c13d16e321efa8ef9b57c95c3bec1722 > Author: Rafael J. Wysocki <rjw@xxxxxxx> > Date: Fri Jan 7 01:44:28 2011 +0100 > > ACPI / PM: Update file information and the list of includes in nvs.c > > > Notebook is Lenovo X201s. 8GB RAM. 256GB SSD. > > > Thanks, > Jeff > > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
