commit: 65ada547d68dc075aa06df92fe325bff07cbc606
From: Takashi YOSHII <[email protected]>
Date: Fri, 17 Dec 2010 07:25:09 +0000
Subject: [PATCH] clocksource: sh_cmt: Remove nested spinlock fix
There are control flow that sh_cmt_set_next() does double
spin-lock. The callers sh_cmt_{start,stop}() already have
lock. But another callers sh_cmt_clock_event_{start,next}()
does not.
Now sh_cmt_set_next() does not lock by itself. All the
callers should hold spin-lock before calling it.
[[email protected]: use __sh_cmt_set_next() to simplify code]
[[email protected]: added stable, suitable for v2.6.35 + v2.6.36]
Cc: [email protected]
Signed-off-by: Takashi YOSHII <[email protected]>
Signed-off-by: Magnus Damm <[email protected]>
Signed-off-by: Paul Mundt <[email protected]>
---
drivers/clocksource/sh_cmt.c | 17 +++++++++++------
1 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index d68d3aa..f975d24 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -283,16 +283,21 @@ static void sh_cmt_clock_event_program_verify(struct
sh_cmt_priv *p,
} while (delay);
}
-static void sh_cmt_set_next(struct sh_cmt_priv *p, unsigned long delta)
+static void __sh_cmt_set_next(struct sh_cmt_priv *p, unsigned long delta)
{
- unsigned long flags;
-
if (delta > p->max_match_value)
dev_warn(&p->pdev->dev, "delta out of range\n");
- spin_lock_irqsave(&p->lock, flags);
p->next_match_value = delta;
sh_cmt_clock_event_program_verify(p, 0);
+}
+
+static void sh_cmt_set_next(struct sh_cmt_priv *p, unsigned long delta)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&p->lock, flags);
+ __sh_cmt_set_next(p, delta);
spin_unlock_irqrestore(&p->lock, flags);
}
@@ -359,7 +364,7 @@ static int sh_cmt_start(struct sh_cmt_priv *p, unsigned
long flag)
/* setup timeout if no clockevent */
if ((flag == FLAG_CLOCKSOURCE) && (!(p->flags & FLAG_CLOCKEVENT)))
- sh_cmt_set_next(p, p->max_match_value);
+ __sh_cmt_set_next(p, p->max_match_value);
out:
spin_unlock_irqrestore(&p->lock, flags);
@@ -381,7 +386,7 @@ static void sh_cmt_stop(struct sh_cmt_priv *p, unsigned
long flag)
/* adjust the timeout to maximum if only clocksource left */
if ((flag == FLAG_CLOCKEVENT) && (p->flags & FLAG_CLOCKSOURCE))
- sh_cmt_set_next(p, p->max_match_value);
+ __sh_cmt_set_next(p, p->max_match_value);
spin_unlock_irqrestore(&p->lock, flags);
}
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