From: Juergen Gross jgross@suse.com
stable inclusion from stable-5.10.68 commit cd64b416aed2f152d89c25db2ebf4f05e16fc08d bugzilla: 182671 https://gitee.com/openeuler/kernel/issues/I4EWUH
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 0560204b360a332c321124dbc5cdfd3364533a74 upstream.
If there is no legacy RTC device, don't try to use it for storing trace data across suspend/resume.
Cc: stable@vger.kernel.org Signed-off-by: Juergen Gross jgross@suse.com Reviewed-by: Rafael J. Wysocki rafael@kernel.org Link: https://lore.kernel.org/r/20210903084937.19392-2-jgross@suse.com Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/base/power/trace.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c index a97f33d0c59f..94665037f4a3 100644 --- a/drivers/base/power/trace.c +++ b/drivers/base/power/trace.c @@ -13,6 +13,7 @@ #include <linux/export.h> #include <linux/rtc.h> #include <linux/suspend.h> +#include <linux/init.h>
#include <linux/mc146818rtc.h>
@@ -165,6 +166,9 @@ void generate_pm_trace(const void *tracedata, unsigned int user) const char *file = *(const char **)(tracedata + 2); unsigned int user_hash_value, file_hash_value;
+ if (!x86_platform.legacy.rtc) + return; + user_hash_value = user % USERHASH; file_hash_value = hash_string(lineno, file, FILEHASH); set_magic_time(user_hash_value, file_hash_value, dev_hash_value); @@ -267,6 +271,9 @@ static struct notifier_block pm_trace_nb = {
static int __init early_resume_init(void) { + if (!x86_platform.legacy.rtc) + return 0; + hash_value_early_read = read_magic_time(); register_pm_notifier(&pm_trace_nb); return 0; @@ -277,6 +284,9 @@ static int __init late_resume_init(void) unsigned int val = hash_value_early_read; unsigned int user, file, dev;
+ if (!x86_platform.legacy.rtc) + return 0; + user = val % USERHASH; val = val / USERHASH; file = val % FILEHASH;