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| author | David Lechner | 2018-01-05 02:46:08 +0100 |
|---|---|---|
| committer | Stephen Boyd | 2018-01-10 22:39:31 +0100 |
| commit | a12aa8a68dfef5de181f2e555aa950a0ab05411f (patch) | |
| tree | f2faf66b671c503e15028be86a07e70f63767f96 /drivers/clk/ti/clk-2xxx.c | |
| parent | Linux 4.15-rc1 (diff) | |
| download | kernel-qcow2-linux-a12aa8a68dfef5de181f2e555aa950a0ab05411f.tar.gz kernel-qcow2-linux-a12aa8a68dfef5de181f2e555aa950a0ab05411f.tar.xz kernel-qcow2-linux-a12aa8a68dfef5de181f2e555aa950a0ab05411f.zip | |
clk: fix reentrancy of clk_enable() on UP systems
Reentrant calls to clk_enable() are not working on UP systems. This is
caused by the fact spin_trylock_irqsave() always returns true when
CONFIG_SMP=n (and CONFIG_DEBUG_SPINLOCK=n) which causes the reference
counting to not work correctly when clk_enable_lock() is called twice
before clk_enable_unlock() is called (this happens when clk_enable()
is called from within another clk_enable()).
This fixes the problem by skipping the call to spin_trylock_irqsave() on UP
systems and relying solely on reference counting. We also make sure to set
flags in this case so that we are not returning an uninitialized value.
Suggested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk/ti/clk-2xxx.c')
0 files changed, 0 insertions, 0 deletions