> -----Original Message-----
> From: Hilman, Kevin
> Sent: Friday, March 04, 2011 6:05 AM
> To: DebBarma, Tarun Kanti
> Cc: linux-omap@xxxxxxxxxxxxxxx; Gopinath, Thara
> Subject: Re: [PATCH v11 5/8] OMAP: dmtimer: platform driver
>
> Tarun Kanti DebBarma <tarun.kanti@xxxxxx> writes:
>
> > From: Thara Gopinath <thara@xxxxxx>
> >
> > Add dmtimer platform driver functions which include:
> > (1) platform driver initialization
> > (2) driver probe function
> > (3) driver remove function
> >
> > Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@xxxxxx>
> > Signed-off-by: Thara Gopinath <thara@xxxxxx>
> > Acked-by: Cousson, Benoit <b-cousson@xxxxxx>
>
> Some locking issues below...
>
> > ---
> > arch/arm/plat-omap/dmtimer.c | 167
> ++++++++++++++++++++++++++++-
> > arch/arm/plat-omap/include/plat/dmtimer.h | 2 +
> > 2 files changed, 168 insertions(+), 1 deletions(-)
> >
> > diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
> > index 1bfaf09..bfe6fd3 100644
> > --- a/arch/arm/plat-omap/dmtimer.c
> > +++ b/arch/arm/plat-omap/dmtimer.c
> > @@ -43,6 +43,9 @@
> > #include <linux/delay.h>
> > #include <linux/io.h>
> > #include <linux/module.h>
> > +#include <linux/slab.h>
> > +#include <linux/err.h>
> > +#include <linux/platform_device.h>
> > #include <mach/hardware.h>
> > #include <plat/dmtimer.h>
> > #include <mach/irqs.h>
> > @@ -257,7 +260,8 @@ static struct omap_dm_timer *dm_timers;
> > static const char **dm_source_names;
> > static struct clk **dm_source_clocks;
> >
> > -static spinlock_t dm_timer_lock;
> > +static LIST_HEAD(omap_timer_list);
> > +static DEFINE_SPINLOCK(dm_timer_lock);
>
> This spinlock is being used as a mutex. Please use a mutex instead.
Alright, I will use mutex instead.
>
> > /*
> > * Reads timer registers in posted and non-posted mode. The posted mode
> bit
> > @@ -689,6 +693,167 @@ int omap_dm_timers_active(void)
> > }
> > EXPORT_SYMBOL_GPL(omap_dm_timers_active);
> >
> > +/**
> > + * omap_dm_timer_probe - probe function called for every registered
> device
> > + * @pdev: pointer to current timer platform device
> > + *
> > + * Called by driver framework at the end of device registration for all
> > + * timer devices.
> > + */
> > +static int __devinit omap_dm_timer_probe(struct platform_device *pdev)
> > +{
> > + int ret;
> > + unsigned long flags;
> > + struct omap_dm_timer *timer;
> > + struct resource *mem, *irq, *ioarea;
> > + struct dmtimer_platform_data *pdata = pdev->dev.platform_data;
> > +
> > + if (!pdata) {
> > + dev_err(&pdev->dev, "%s: no platform data\n", __func__);
> > + return -ENODEV;
> > + }
> > +
> > + spin_lock_irqsave(&dm_timer_lock, flags);
>
> Why do you need IRQ versions of the locks? This lock is never used in
> interrupt context.
Yes.
>
> Kevin
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