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bus: ti-sysc: Fix iterating over clocks 

commit 2c81f0f6d3 upstream.

Commit d878970f6c ("bus: ti-sysc: Add separate functions for handling
clocks") separated handling of optional clocks from the main clocks, but
introduced an issue where we do not necessarily allocate a slot for both
fck and ick clocks, but still assume fixed slots for enumerating over the
clocks.

Let's fix the issue by ensuring we always have slots for both fck and ick
even if we don't use ick, and don't attempt to enumerate optional clocks
if not allocated.

In the long run we might want to simplify things a bit by only allocating
space only for the optional clocks as we have only few devices with
optional clocks.

Fixes: d878970f6c ("bus: ti-sysc: Add separate functions for handling clocks")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Tony Lindgren 2019-12-16 14:41:53 -08:00 committed by Greg Kroah-Hartman
parent 289ecfaadf
commit 5aacb4de36
1 changed files with 8 additions and 2 deletions
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10
drivers/bus/ti-sysc.c
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@ -343,6 +343,12 @@ static int sysc_get_clocks(struct sysc *ddata)
return -EINVAL;
}
/* Always add a slot for main clocks fck and ick even if unused */
if (!nr_fck)
ddata->nr_clocks++;
if (!nr_ick)
ddata->nr_clocks++;
ddata->clocks = devm_kcalloc(ddata->dev,
ddata->nr_clocks, sizeof(*ddata->clocks),
GFP_KERNEL);
@ -421,7 +427,7 @@ static int sysc_enable_opt_clocks(struct sysc *ddata)
struct clk *clock;
int i, error;
if (!ddata->clocks)
if (!ddata->clocks || ddata->nr_clocks < SYSC_OPTFCK0 + 1)
return 0;
for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
@ -455,7 +461,7 @@ static void sysc_disable_opt_clocks(struct sysc *ddata)
struct clk *clock;
int i;
if (!ddata->clocks)
if (!ddata->clocks || ddata->nr_clocks < SYSC_OPTFCK0 + 1)
return;
for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {