From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Stephen Boyd <sboyd@codeaurora.org>,
linux-kernel@vger.kernel.org, heikki.krogerus@linux.intel.com
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH v3 1/3] clk: fractional-divider: fix sparse warnings
Date: Wed, 1 Apr 2015 13:09:06 +0300 [thread overview]
Message-ID: <1427882948-97260-2-git-send-email-andriy.shevchenko@linux.intel.com> (raw)
In-Reply-To: <1427882948-97260-1-git-send-email-andriy.shevchenko@linux.intel.com>
Sparse complains about possible imbalance in locking.
drivers/clk/clk-fractional-divider.c:37:9: warning: context imbalance in 'clk_fd_recalc_rate' - different lock contexts for basic block
drivers/clk/clk-fractional-divider.c:61:12: warning: context imbalance in 'clk_fd_set_rate' - different lock contexts for basic block
Let's rewrite code to fix this and make it more straight.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/clk/clk-fractional-divider.c | 44 +++++++++++++++++++++---------------
1 file changed, 26 insertions(+), 18 deletions(-)
diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c
index 6aa72d9..786aa482 100644
--- a/drivers/clk/clk-fractional-divider.c
+++ b/drivers/clk/clk-fractional-divider.c
@@ -21,17 +21,18 @@ static unsigned long clk_fd_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
- unsigned long flags = 0;
- u32 val, m, n;
+ unsigned long flags;
+ unsigned long m, n;
+ u32 val;
u64 ret;
- if (fd->lock)
+ if (fd->lock) {
spin_lock_irqsave(fd->lock, flags);
-
- val = clk_readl(fd->reg);
-
- if (fd->lock)
+ val = clk_readl(fd->reg);
spin_unlock_irqrestore(fd->lock, flags);
+ } else {
+ val = clk_readl(fd->reg);
+ }
m = (val & fd->mmask) >> fd->mshift;
n = (val & fd->nmask) >> fd->nshift;
@@ -65,29 +66,36 @@ static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate,
return rate;
}
+static void clk_fd_update(struct clk_fractional_divider *fd,
+ unsigned long m, unsigned long n)
+{
+ u32 val;
+
+ val = clk_readl(fd->reg);
+ val &= ~(fd->mmask | fd->nmask);
+ val |= (m << fd->mshift) | (n << fd->nshift);
+ clk_writel(val, fd->reg);
+}
+
static int clk_fd_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
- unsigned long flags = 0;
+ unsigned long flags;
unsigned long div;
- unsigned n, m;
- u32 val;
+ unsigned long m, n;
div = gcd(parent_rate, rate);
m = rate / div;
n = parent_rate / div;
- if (fd->lock)
+ if (fd->lock) {
spin_lock_irqsave(fd->lock, flags);
-
- val = clk_readl(fd->reg);
- val &= ~(fd->mmask | fd->nmask);
- val |= (m << fd->mshift) | (n << fd->nshift);
- clk_writel(val, fd->reg);
-
- if (fd->lock)
+ clk_fd_update(fd, m, n);
spin_unlock_irqrestore(fd->lock, flags);
+ } else {
+ clk_fd_update(fd, m, n);
+ }
return 0;
}
--
2.1.4
next prev parent reply other threads:[~2015-04-01 10:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-01 10:09 [PATCH v3 0/3] clk: fractional-divider: do a clean up Andy Shevchenko
2015-04-01 10:09 ` Andy Shevchenko [this message]
2015-04-01 10:09 ` [PATCH v3 2/3] clk: fractional-divider: keep mwidth and nwidth internally Andy Shevchenko
2015-04-09 8:22 ` Ming Lei
2015-05-06 10:58 ` Andy Shevchenko
2015-04-01 10:09 ` [PATCH v3 3/3] clk: fractional-divider: switch to rational best approximation Andy Shevchenko
2015-06-18 20:39 ` [PATCH v3 0/3] clk: fractional-divider: do a clean up Stephen Boyd
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