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driver/uart_16550: serial output can cause deadlock 

All interrupts must be disabled to prevent re-entrancy and to prevent
interrupts from firing in the serial driver code.

Signed-off-by: hujun5 <hujun5@xiaomi.com>
This commit is contained in:
hujun5 2023-05-12 12:37:21 +08:00 committed by Xiang Xiao
parent 555506a584
commit 6da335cd81
1 changed files with 8 additions and 3 deletions
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11
drivers/serial/uart_16550.c
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@ -1340,9 +1340,13 @@ void u16550_serialinit(void)
int up_putc(int ch)
{
FAR struct u16550_s *priv = (FAR struct u16550_s *)CONSOLE_DEV.priv;
uart_datawidth_t ier;
irqstate_t flags;
u16550_disableuartint(priv, &ier);
/* All interrupts must be disabled to prevent re-entrancy and to prevent
* interrupts from firing in the serial driver code.
*/
flags = enter_critical_section();
/* Check for LF */
@ -1354,7 +1358,8 @@ int up_putc(int ch)
}
u16550_putc(priv, ch);
u16550_restoreuartint(priv, ier);
leave_critical_section(flags);
return ch;
}
#endif