From: Jiada Wang <jiada_wang@mentor.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: <nick@shmanahar.org>, <linux-input@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <george_davis@mentor.com>
Subject: Re: [PATCH v1 41/63] Input: touchscreen: Atmel: Enable IRQ_DISABLE_UNLAZY flag for interrupt
Date: Thu, 22 Aug 2019 15:25:05 +0900 [thread overview]
Message-ID: <0c4edce0-1295-e36b-e658-c109dfca867e@mentor.com> (raw)
In-Reply-To: <20190816172615.GJ121898@dtor-ws>
Hi Dmitry
On 2019/08/17 2:26, Dmitry Torokhov wrote:
> On Fri, Aug 16, 2019 at 05:35:36PM +0900, Jiada Wang wrote:
>> From: Bhuvanesh Surachari <bhuvanesh_surachari@mentor.com>
>>
>> The de-/serializer driver has defined only irq_mask "ds90ub927_irq_mask" and
>> irq_unmask "ds90ub927_irq_unmask" callback functions. And de-/serializer
>> driver doesn't implement the irq_disable and irq_enable callback functions.
>> Hence inorder to invoke irq_mask callback function when disable_irq_nosync is
>> called the IRQ_DISABLE_UNLAZY interrupt flag should be set. If not the
>> disable_irq_nosync will just increment the depth field in the irq
>> descriptor only once as shown below.
>>
>> disable_irq_nosync
>> __disable_irq_nosync
>> __disable_irq (desc->depth++)
>> irq_disable
>> if irq_disable present -----------> if IRQ_DISABLE_UNLAZYflag set
>> | no |
>> yes | yes |
>> | |
>> desc->irq_data.chip->irq_disable desc->irq_data.chip->irq_unmask
>> (ds90ub927_irq_mask)
>> disable_irq
>> __disable_irq_nosync
>> __disable_irq
>> (desc->depth++)
>> But the enable_irq will try to decrement the depth field twice which generates
>> the backtrace stating "Unbalanced enable for irq 293". This is because there is
>> no IRQ_DISABLE_UNLAZY flag check while calling irq_unmask callback function
>> of the "ds90ub927_irq_unmask" de-/serializer via enable_irq.
>>
>> enable_irq
>> __enable_irq (desc->depth--)
>> irq_enable
>> if irq_enable present -------------> desc->irq_data.chip->irq_unmask
>> | no (ds90ub927_irq_unmask)
>> yes | enable_irq
>> | __enable_irq (desc->depth--)
>> (desc->irq_data.chip->irq_enable)
>
> I'd prefer if we instead did not use the disable_irq_nosync() in the
> driver.
>
sorry for the mistake, during forward port,
I have already eliminated disable_irq_nosync(),
so this patch is no longer needed,
will drop it in v2 patch-set
Thanks,
Jiada
> Thanks.
>
next prev parent reply other threads:[~2019-08-22 6:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 8:35 [PATCH v1 40/63] input: atmel_mxt_ts: Add Missing Delay for reset handling of Atmel touch panel controller in detachable displays Jiada Wang
2019-08-16 8:35 ` [PATCH v1 41/63] Input: touchscreen: Atmel: Enable IRQ_DISABLE_UNLAZY flag for interrupt Jiada Wang
2019-08-16 17:26 ` Dmitry Torokhov
2019-08-22 6:25 ` Jiada Wang [this message]
2019-08-16 8:35 ` [PATCH v2 42/63] Input: atmel_mxt_ts: Limit the max bytes transferred in an i2c transaction Jiada Wang
2019-08-16 8:35 ` [PATCH v1 43/63] Input: atmel_mxt_ts: update stale use_retrigen_workaround flag Jiada Wang
2019-08-16 8:35 ` [PATCH v1 44/63] Input: atmel_mxt_ts: return error from mxt_process_messages_until_invalid() Jiada Wang
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