提交 3f8517e7 编写于 作者: N Nicolas Pitre 提交者: Russell King

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 0902a904 ("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: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
上级 483a6c9d
......@@ -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;
......
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