linux-kernel - Re: [PATCH 2/2] Fix warning during compilation

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Message-ID: <837c4c31-55e3-48ec-d353-0bd614c6d2e4@amk-drives.bg>
Date:   Wed, 4 Jan 2017 08:36:20 +0200
From:   Ivan Stoyanov <ivan.stoyanov@...-drives.bg>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     vinod.koul@...el.com, dan.j.williams@...el.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        amk <amk@...-drives.bg>
Subject: Re: [PATCH 2/2] Fix warning during compilation

I have done this patch for mainline because since v4.3 the ipu driver 
doesn't work properly.
The reason is mistake in v4.3 considering both functions ipu_irq_err and 
ipu_irq_fn for equal and they was merged to ipu_irq_handler.
But there is only one difference between these functions which was missed.

In ipu_irq_err:
for (i = IPU_IRQ_NR_FN_BANKS; i < IPU_IRQ_NR_BANKS; i++) {

In ipu_irq_fn:
for (i = 0; i < IPU_IRQ_NR_FN_BANKS; i++) {

All kernel versions since v4.3 make kernel to freeze on boot.

Kind regards,
Ivan

On 3.1.2017 г. 23:57 ч., Arnd Bergmann wrote:
> On Tuesday, January 3, 2017 10:23:29 AM CET ivan.stoyanov@...-drives.bg wrote:
>> From: amk <amk@...-drives.bg>
>>
>> drivers/dma/ipu/ipu_irq.c: In function 'ipu_irq_fn':
>> drivers/dma/ipu/ipu_irq.c:342:4: warning: 'irq' may be used uninitialized in this function [-Wmaybe-uninitialized]
>>
>> Signed-off-by: amk <amk@...-drives.bg>
>> ---
> This looks like my patch 86c7e6836479 ("dmaengine: ipu: remove bogus NO_IRQ reference")
> that was applied in September, but it seems to be written for an older kernel
> prior to v4.3.
>
> Which kernel version were you testing on?
>
> 	Arnd

-- 
Best regards,

Ivan Stoyanov

AMK "Drives and Controls" Ltd.
Bulgaria
5300 Gabrovo
1 "Gen. Nikolov" str.
www.amk-drives.bg

Phone:  +359 / 66 / 819136
E-mail: ivan.stoyanov@...-drives.bg