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hvc_dcc: Disable preemption when cheking for smp_processor_id

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smp_processor_id() complains if called from a preemptible
context. Hence, disable the preemption just before calling
this and enable it back later.

Change-Id: I6721796d11186eb15021b37d5ea8250afa0edda0
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>
This commit is contained in:
Raghavendra Rao Ananta 2019-06-04 23:15:14 -07:00
parent 1462003eed
commit 44fcbe837a
1 changed files with 7 additions and 1 deletions
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8
drivers/tty/hvc/hvc_dcc.c
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@ -72,12 +72,18 @@ static bool hvc_dcc_check(void)
static bool dcc_core0_available;
preempt_disable();
/*
* If we're not on core 0, but we previously confirmed that DCC is
* active, then just return true.
*/
if (smp_processor_id() && dcc_core0_available)
if (smp_processor_id() && dcc_core0_available) {
preempt_enable();
return true;
}
preempt_enable();
/* Write a test character to check if it is handled */
__dcc_putchar('\n');