[PATCH] Fix wrong register read address and add interrupt acknowledge.

[PATCH] Fix wrong register read address and add interrupt acknowledge.

[Benjamin Krill]

The receive interrupt routine checks the wrong register if the
receive fifo is empty. Further an explicit interrupt acknowledge
write is introduced. In some circumstances another interrupt was
issued.

Signed-off-by: Benjamin Krill <ben@codiert.org>
---
 drivers/serial/nwpserial.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/nwpserial.c b/drivers/serial/nwpserial.c
index 32f3eaf..9e150b1 100644
--- a/drivers/serial/nwpserial.c
+++ b/drivers/serial/nwpserial.c
@@ -145,11 +145,13 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
 		ch = dcr_read(up->dcr_host, UART_RX);
 		if (up->port.ignore_status_mask != NWPSERIAL_STATUS_RXVALID)
 			tty_insert_flip_char(tty, ch, TTY_NORMAL);
-	} while (dcr_read(up->dcr_host, UART_RX) & UART_LSR_DR);
+	} while (dcr_read(up->dcr_host, UART_LSR) & UART_LSR_DR);

 	tty_flip_buffer_push(tty);
 	ret = IRQ_HANDLED;

+	/* clear interrupt */
+	dcr_write(up->dcr_host, UART_IIR, 1);
 out:
 	spin_unlock(&up->port.lock);
 	return ret;
--
1.5.4.5

Re: [PATCH] Fix wrong register read address and add interrupt acknowledge.

[Timur Tabi]

On Tue, May 5, 2009 at 2:11 PM, Benjamin Krill <ben@codiert.org> wrote:
> The receive interrupt routine checks the wrong register if the
> receive fifo is empty. Further an explicit interrupt acknowledge
> write is introduced. In some circumstances another interrupt was
> issued.

The one-line summary of your patch is too vague.  It should mention
the name of the driver somehow.

-- 
Timur Tabi
Linux kernel developer at Freescale

Re: [PATCH] Fix wrong register read address and add interrupt acknowledge.

[Josh Boyer]

On Tue, May 05, 2009 at 02:24:04PM -0500, Timur Tabi wrote:
>On Tue, May 5, 2009 at 2:11 PM, Benjamin Krill <ben@codiert.org> wrote:
>> The receive interrupt routine checks the wrong register if the
>> receive fifo is empty. Further an explicit interrupt acknowledge
>> write is introduced. In some circumstances another interrupt was
>> issued.
>
>The one-line summary of your patch is too vague.  It should mention
>the name of the driver somehow.

That is quite true.  Although resending the patch just for that seems overkill.
The maintainer can edit the summary rather easily.

josh

Re: [PATCH] Fix wrong register read address and add interrupt acknowledge.

[Benjamin Krill]

* Josh Boyer | 2009-05-05 19:09:19 [-0400]:

>On Tue, May 05, 2009 at 02:24:04PM -0500, Timur Tabi wrote:
>>On Tue, May 5, 2009 at 2:11 PM, Benjamin Krill <ben@codiert.org> wrote:
>
>That is quite true.  Although resending the patch just for that seems overkill.
>The maintainer can edit the summary rather easily.

Ben, could you please merge this patch in your next tree?


cheers
  ben