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40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
--- a/drivers/serial/8250.c
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+++ b/drivers/serial/8250.c
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@@ -1743,6 +1743,7 @@ static void serial8250_backup_timeout(un
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unsigned int iir, ier = 0, lsr;
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unsigned long flags;
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+ spin_lock_irqsave(&up->port.lock, flags);
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/*
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* Must disable interrupts or else we risk racing with the interrupt
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* based handler.
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@@ -1760,10 +1761,8 @@ static void serial8250_backup_timeout(un
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* the "Diva" UART used on the management processor on many HP
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* ia64 and parisc boxes.
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*/
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- spin_lock_irqsave(&up->port.lock, flags);
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lsr = serial_in(up, UART_LSR);
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up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
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- spin_unlock_irqrestore(&up->port.lock, flags);
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if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
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(!uart_circ_empty(&up->port.info->xmit) || up->port.x_char) &&
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(lsr & UART_LSR_THRE)) {
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@@ -1771,12 +1770,14 @@ static void serial8250_backup_timeout(un
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iir |= UART_IIR_THRI;
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}
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- if (!(iir & UART_IIR_NO_INT))
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- serial8250_handle_port(up);
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-
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if (is_real_interrupt(up->port.irq))
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serial_out(up, UART_IER, ier);
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+ spin_unlock_irqrestore(&up->port.lock, flags);
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+
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+ if (!(iir & UART_IIR_NO_INT))
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+ serial8250_handle_port(up);
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+
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/* Standard timer interval plus 0.2s to keep the port running */
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mod_timer(&up->timer,
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jiffies + poll_timeout(up->port.timeout) + HZ / 5);
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