linux-kernel - Re: [PATCHv2] omap:mailbox: resolve hang issue

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Date:	Wed, 2 Mar 2011 20:51:41 -0600
From:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Armando Uribe <x0095078@...com>, hiroshi.doyu@...ia.com,
	ohad@...ery.com, Russell King <linux@....linux.org.uk>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Hari Kanigeri <h-kanigeri2@...com>
Subject: Re: [PATCHv2] omap:mailbox: resolve hang issue

On Wed, Mar 2, 2011 at 7:44 PM, Tony Lindgren <tony@...mide.com> wrote:
> * Armando Uribe <x0095078@...com> [110302 13:54]:
>> From: Hari Kanigeri <h-kanigeri2@...com>
>>
>> omap4 interrupt disable bits is different. On rx kfifo full, the mbox rx
>> interrupts wasn't getting disabled, and this is causing the rcm stress tests
>> to hang.
>>
>> Signed-off-by: Hari Kanigeri <h-kanigeri2@...com>
>> Signed-off-by: Armando Uribe <x0095078@...com>
>> Signed-off-by: Fernando Guzman Lugo <fernando.lugo@...com>
>
> Should we merge this as a fix for the 2.6.38 still?

yeah, if it can still be merged in 2.6.38 because it is a fix it would be great.

Regards,
Fernando.

>
> Tony
>
>> ---
>>  arch/arm/mach-omap2/mailbox.c |   10 ++++++----
>>  1 files changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c
>> index 394413d..011ca50 100644
>> --- a/arch/arm/mach-omap2/mailbox.c
>> +++ b/arch/arm/mach-omap2/mailbox.c
>> @@ -193,10 +193,12 @@ static void omap2_mbox_disable_irq(struct omap_mbox *mbox,
>>               omap_mbox_type_t irq)
>>  {
>>       struct omap_mbox2_priv *p = mbox->priv;
>> -     u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
>> -     l = mbox_read_reg(p->irqdisable);
>> -     l &= ~bit;
>> -     mbox_write_reg(l, p->irqdisable);
>> +     u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
>> +
>> +     if (!cpu_is_omap44xx())
>> +             bit = mbox_read_reg(p->irqdisable) & ~bit;
>> +
>> +     mbox_write_reg(bit, p->irqdisable);
>>  }
>>
>>  static void omap2_mbox_ack_irq(struct omap_mbox *mbox,
>> --
>> 1.7.0.4
>>
>
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