linux-kernel - [PATCH 3/5] ARM: etm: Don't trigger another overflow when trying to clear the RAM-full status

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Date:	Wed,  2 Feb 2011 18:54:21 -0800
From:	Arve Hjønnevåg <arve@...roid.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Russell King <linux@....linux.org.uk>,
	Alexander Shishkin <virtuoso@...nd.org>,
	Jason Wessel <jason.wessel@...driver.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] ARM: etm: Don't trigger another overflow when trying to clear the RAM-full status

If the write address was at the end of the buffer, toggling the trace
capture bit would set the RAM-full status instead of clearing it.

Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
---
 arch/arm/kernel/etm.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
index 2ea0b7c..7652e9f 100644
--- a/arch/arm/kernel/etm.c
+++ b/arch/arm/kernel/etm.c
@@ -235,6 +235,7 @@ static void etm_dump(void)
 	printk(KERN_INFO "\n--- ETB buffer end ---\n");
 
 	/* deassert the overflow bit */
+	etb_writel(t, 0, ETBR_WRITEADDR);
 	etb_writel(t, 1, ETBR_CTRL);
 	etb_writel(t, 0, ETBR_CTRL);
 
@@ -300,6 +301,7 @@ static ssize_t etb_read(struct file *file, char __user *data,
 		buf[i] = etb_readl(t, ETBR_READMEM);
 
 	/* the only way to deassert overflow bit in ETB status is this */
+	etb_writel(t, 0, ETBR_WRITEADDR);
 	etb_writel(t, 1, ETBR_CTRL);
 	etb_writel(t, 0, ETBR_CTRL);
 
-- 
1.7.3.1

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