From 3f8517e7937d04ac7df9082c741fefc9c873065b Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Fri, 23 May 2014 22:31:44 +0100 Subject: [PATCH] ARM: 8063/1: bL_switcher: fix individual online status reporting of removed CPUs The content of /sys/devices/system/cpu/cpu*/online is still 1 for those CPUs that the switcher has removed even though the global state in /sys/devices/system/cpu/online is updated correctly. It turns out that commit 0902a9044f ("Driver core: Use generic offline/online for CPU offline/online") has changed the way those files retrieve their content by relying on on the generic attribute handling code. The switcher, by calling cpu_down() directly, bypasses this handling and the attribute value doesn't get updated. Fix this by calling device_offline()/device_online() instead. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/common/bL_switcher.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c index f01c0ee0c87eb..490f3dced7499 100644 --- a/arch/arm/common/bL_switcher.c +++ b/arch/arm/common/bL_switcher.c @@ -433,8 +433,12 @@ static void bL_switcher_restore_cpus(void) { int i; - for_each_cpu(i, &bL_switcher_removed_logical_cpus) - cpu_up(i); + for_each_cpu(i, &bL_switcher_removed_logical_cpus) { + struct device *cpu_dev = get_cpu_device(i); + int ret = device_online(cpu_dev); + if (ret) + dev_err(cpu_dev, "switcher: unable to restore CPU\n"); + } } static int bL_switcher_halve_cpus(void) @@ -521,7 +525,7 @@ static int bL_switcher_halve_cpus(void) continue; } - ret = cpu_down(i); + ret = device_offline(get_cpu_device(i)); if (ret) { bL_switcher_restore_cpus(); return ret;