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ARM: clps711x: serial driver hungs are a result of call disable_irq within ISR

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Since 2.6.30-rc1 clps711x serial driver hungs system. This is a result
of call disable_irq from ISR. synchronize_irq waits for end of interrupt
and goes to infinite loop. This patch fix this problem.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shiyan 2012-03-27 12:22:49 +04:00 committed by Greg Kroah-Hartman
parent e816b57a33
commit 7a6fbc9a88
1 changed files with 8 additions and 6 deletions
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14
drivers/tty/serial/clps711x.c
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@ -154,10 +154,9 @@ static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id)
port->x_char = 0;
return IRQ_HANDLED;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
clps711xuart_stop_tx(port);
return IRQ_HANDLED;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
goto disable_tx_irq;
count = port->fifosize >> 1;
do {
@ -171,8 +170,11 @@ static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id)
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
clps711xuart_stop_tx(port);
if (uart_circ_empty(xmit)) {
disable_tx_irq:
disable_irq_nosync(TX_IRQ(port));
tx_enabled(port) = 0;
}
return IRQ_HANDLED;
}