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ARM: bcm: don't special-case CPU 0 in bcm_kona_smc()

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There's logic in bcm_kona_smc() to ensure __bcm_kona_smc() gets
called on CPU 0; if already executing on CPU 0, that function is
called directly.  The direct call is not protected from interrupts,
however, which is not safe.

Note that smp_call_function_single() is designed to handle the case
where the target cpu is the current one.  It also gets a reference
to the CPU and disables IRQs across the call.

So we can simplify things and at the same time be protected against
interrupts by calling smp_call_function_single() unconditionally.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Reviewed-by: Matt Porter <mporter@linaro.org>
Signed-off-by: Matt Porter <mporter@linaro.org>
This commit is contained in:
Alex Elder 2014-04-21 16:53:06 -05:00 committed by Matt Porter
parent 6c90f10864
commit 35138d52f1
1 changed files with 1 additions and 6 deletions
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7
arch/arm/mach-bcm/bcm_kona_smc.c
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@ -114,12 +114,7 @@ unsigned bcm_kona_smc(unsigned service_id, unsigned arg0, unsigned arg1,
* Due to a limitation of the secure monitor, we must use the SMP
* infrastructure to forward all secure monitor calls to Core 0.
*/
if (get_cpu() != 0)
smp_call_function_single(0, __bcm_kona_smc, (void *)&data, 1);
else
__bcm_kona_smc(&data);
put_cpu();
smp_call_function_single(0, __bcm_kona_smc, &data, 1);
return data.result;
}