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authorSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>2012-06-16 15:30:45 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-07-01 13:31:22 +0200
commit443772d408a25af62498793f6f805ce3c559309a (patch)
treef89e50547524bbb275d38b8a39b1e4d82a18c22d /Documentation/ABI
parent62c552ccc3eda1198632a4f344aa32623d226bab (diff)
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ftrace: Disable function tracing during suspend/resume and hibernation, again
If function tracing is enabled for some of the low-level suspend/resume functions, it leads to triple fault during resume from suspend, ultimately ending up in a reboot instead of a resume (or a total refusal to come out of suspended state, on some machines). This issue was explained in more detail in commit f42ac38c59e0a03d (ftrace: disable tracing for suspend to ram). However, the changes made by that commit got reverted by commit cbe2f5a6e84eebb (tracing: allow tracing of suspend/resume & hibernation code again). So, unfortunately since things are not yet robust enough to allow tracing of low-level suspend/resume functions, suspend/resume is still broken when ftrace is enabled. So fix this by disabling function tracing during suspend/resume & hibernation. Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: stable@vger.kernel.org Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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