From: Laurent Pinchart <[email protected]> The global spinlock is used to protect the shared start/stop register. Now that all MTU2 channels are handled by a single device instance, use a per-device spinlock.
Signed-off-by: Laurent Pinchart <[email protected]> Tested-by: Wolfram Sang <[email protected]> --- drivers/clocksource/sh_mtu2.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c index 0342e4a..b0c229f 100644 --- a/drivers/clocksource/sh_mtu2.c +++ b/drivers/clocksource/sh_mtu2.c @@ -47,14 +47,14 @@ struct sh_mtu2_device { void __iomem *mapbase; struct clk *clk; + raw_spinlock_t lock; /* Protect the shared registers */ + struct sh_mtu2_channel *channels; unsigned int num_channels; bool has_clockevent; }; -static DEFINE_RAW_SPINLOCK(sh_mtu2_lock); - #define TSTR -1 /* shared register */ #define TCR 0 /* channel register */ #define TMDR 1 /* channel register */ @@ -192,7 +192,7 @@ static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start) unsigned long flags, value; /* start stop register shared by multiple timer channels */ - raw_spin_lock_irqsave(&sh_mtu2_lock, flags); + raw_spin_lock_irqsave(&ch->mtu->lock, flags); value = sh_mtu2_read(ch, TSTR); if (start) @@ -201,7 +201,7 @@ static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start) value &= ~(1 << ch->index); sh_mtu2_write(ch, TSTR, value); - raw_spin_unlock_irqrestore(&sh_mtu2_lock, flags); + raw_spin_unlock_irqrestore(&ch->mtu->lock, flags); } static int sh_mtu2_enable(struct sh_mtu2_channel *ch) @@ -402,6 +402,8 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu, mtu->pdev = pdev; + raw_spin_lock_init(&mtu->lock); + /* Get hold of clock. */ mtu->clk = clk_get(&mtu->pdev->dev, "fck"); if (IS_ERR(mtu->clk)) { -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
