linux-kernel - [PATCH] serial: Clear proper MPSC interrupt cause bits

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Message-ID: <20070622023208.GA20651@mag.az.mvista.com>
Date:	Thu, 21 Jun 2007 19:32:08 -0700
From:	"Mark A. Greer" <mgreer@...sta.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	jaylubo@...orola.com
Subject: [PATCH] serial: Clear proper MPSC interrupt cause bits

From: Jay Lubomirski <jaylubo@...orola.com>

Don't clobber the interrupt cause bits for both MPSC controllers when
clearing the interrupt for one of them.  Just clear the one that is
supposed to be cleared.

Signed-off-by: Jay Lubomirski <jaylubo@...orola.com>
Acked-by: Mark A. Greer <mgreer@...sta.com>
---
 drivers/serial/mpsc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/serial/mpsc.c b/drivers/serial/mpsc.c
index d09f209..00924fe 100644
--- a/drivers/serial/mpsc.c
+++ b/drivers/serial/mpsc.c
@@ -503,7 +503,8 @@ mpsc_sdma_intr_ack(struct mpsc_port_info *pi)

 	if (pi->mirror_regs)
 		pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
-	writel(0, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE);
+	writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE +
+	       pi->port.line);
 	return;
 }

-
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