forked from luck/tmp_suning_uos_patched
PM: base: power: don't try to use non-existing RTC for storing data
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>
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@ -13,6 +13,7 @@
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#include <linux/export.h>
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#include <linux/rtc.h>
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#include <linux/suspend.h>
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#include <linux/init.h>
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#include <linux/mc146818rtc.h>
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@ -165,6 +166,9 @@ void generate_pm_trace(const void *tracedata, unsigned int user)
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const char *file = *(const char **)(tracedata + 2);
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unsigned int user_hash_value, file_hash_value;
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if (!x86_platform.legacy.rtc)
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return;
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user_hash_value = user % USERHASH;
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file_hash_value = hash_string(lineno, file, FILEHASH);
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set_magic_time(user_hash_value, file_hash_value, dev_hash_value);
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@ -267,6 +271,9 @@ static struct notifier_block pm_trace_nb = {
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static int __init early_resume_init(void)
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{
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if (!x86_platform.legacy.rtc)
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return 0;
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hash_value_early_read = read_magic_time();
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register_pm_notifier(&pm_trace_nb);
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return 0;
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@ -277,6 +284,9 @@ static int __init late_resume_init(void)
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unsigned int val = hash_value_early_read;
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unsigned int user, file, dev;
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if (!x86_platform.legacy.rtc)
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return 0;
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user = val % USERHASH;
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val = val / USERHASH;
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file = val % FILEHASH;
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