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ARM: 5688/1: ks8695_serial: disable_irq() lockup 

disable_irq() cannot be called from interrupt context without self imposed deadlock. This was happening in ks8695uart_stop_tx().

Signed-off-by: Dick Hollenbeck <dick@softplc.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Dick Hollenbeck 2009-09-02 17:07:29 +01:00 committed by Russell King
parent 13f96d8f4c
commit c47a830c08
1 changed files with 5 additions and 1 deletions
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6
drivers/serial/serial_ks8695.c
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@ -110,7 +110,11 @@ static struct console ks8695_console;
static void ks8695uart_stop_tx(struct uart_port *port)
{
if (tx_enabled(port)) {
disable_irq(KS8695_IRQ_UART_TX);
/* use disable_irq_nosync() and not disable_irq() to avoid self
* imposed deadlock by not waiting for irq handler to end,
* since this ks8695uart_stop_tx() is called from interrupt context.
*/
disable_irq_nosync(KS8695_IRQ_UART_TX);
tx_enable(port, 0);
}
}