diff options
| author | Juergen Gross <jgross@suse.com> | 2021-09-03 10:49:36 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2021-09-14 09:56:20 +0200 |
| commit | 0560204b360a332c321124dbc5cdfd3364533a74 (patch) | |
| tree | 172eabc3facf51eb98638b8833a34c48c3816845 /drivers | |
| parent | xen/balloon: use a kernel thread instead a workqueue (diff) | |
| download | linux-0560204b360a332c321124dbc5cdfd3364533a74.tar.xz linux-0560204b360a332c321124dbc5cdfd3364533a74.zip | |
PM: base: power: don't try to use non-existing RTC for storing data
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/power/trace.c | 10 |
1 files changed, 10 insertions, 0 deletions
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; |