Messages in this thread | | | Date | Tue, 30 Sep 2014 15:10:56 -0400 (EDT) | Subject | Re: [PATCH] net: ethernet : stmicro: fixed power suspend and resume failure in stmmac driver | From | David Miller <> |
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From: <hliang1025@gmail.com> Date: Tue, 30 Sep 2014 13:55:34 +0800
> From: Hao Liang <hliang1025@gmail.com> > > This is the fix for a power management issue caused by suspend and resume function in stmmac_main.c. > After enable CONFIG_DEBUG_ATOMIC_SLEEP which enable sleep-inside atomic section checking, power > managemet can not work normally. Board couldn't wakeup successfully after suspend. Command > "echo mem > /sys/power/state" suspend the board. > > In suspend and resume function of stmmac driver, there are some sleep-inside function in atomic section > created by spin lock. These functions will causes system warnings and wakeup issue when enable > CONFIG_DEBUG_ATOMIC_SLEEP. > > This bug was fixed by: > * replace some sleep function with non-sleep function > clk_disable_unprepare -> clk_disable ... > * decrease the atomic area created by spin lock function. The original atomic area in resume function is > too large. > > Signed-off-by: Hao Liang <hliang1025@gmail.com>
I really think the ->mac->xxx calls need to be under the lock, and therefore this spinlock region shortening is not valid.
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