diff options
| author | Magnus Damm <damm@opensource.se> | 2011-11-10 00:44:10 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-11-10 00:44:10 +0100 |
| commit | 24050956e029a9ecff096e1992869ada4492963c (patch) | |
| tree | 096341c4741fcc967645578af0acb277f9754501 /drivers/base/power/clock_ops.c | |
| parent | 056879d2f244001b2888cdc8cf868c33ca8b23a0 (diff) | |
| download | linux-24050956e029a9ecff096e1992869ada4492963c.tar.bz2 | |
PM / Clocks: Only disable enabled clocks in pm_clk_suspend()
Refrain from running clk_disable() on clocks that
have not been enabled. A typical case when this can
happen is during Suspend-to-RAM for devices that have
no driver associated with them. In such case the clock
may be in default ACQUIRED state.
Without this patch the sh7372 Mackerel board crashes
in __clk_disable() during Suspend-to-RAM with:
"Trying to disable clock 0xdeadbeef with 0 usecount"
This happens for the CEU device which is added during
boot. The test case has no CEU driver included in the
kernel configuration. Needed for v3.2-rc1.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base/power/clock_ops.c')
| -rw-r--r-- | drivers/base/power/clock_ops.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c index 5f0f85d5c576..428e55e012dc 100644 --- a/drivers/base/power/clock_ops.c +++ b/drivers/base/power/clock_ops.c @@ -229,7 +229,8 @@ int pm_clk_suspend(struct device *dev) list_for_each_entry_reverse(ce, &psd->clock_list, node) { if (ce->status < PCE_STATUS_ERROR) { - clk_disable(ce->clk); + if (ce->status == PCE_STATUS_ENABLED) + clk_disable(ce->clk); ce->status = PCE_STATUS_ACQUIRED; } } |