linux-kernel - Re: [PATCH] added S6E63M0 AMOLED LCD Panel driver.

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Date:	Wed, 31 Mar 2010 11:41:54 +0900
From:	InKi Dae <daeinki@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Pavel Machek <pavel@....cz>,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kyungmin.park@...sung.com
Subject: Re: [PATCH] added S6E63M0 AMOLED LCD Panel driver.

Hi Andrew,

all the calls to s6e63m0_panel_send_sequence() would return -EINVAL.
by api_async() of driver/spi/spi.c
so I think that those return values aren't changed to other.

and final step is to check only whether the return value is 0 or not.
if you still think that this code has minor problem or you want it to
be corrected
then I will patch this code to be corrected anytime.

Thank you.

2010/3/31 Andrew Morton <akpm@...ux-foundation.org>:
> On Fri, 26 Mar 2010 12:24:24 +0900
> InKi Dae <daeinki@...il.com> wrote:
>
>> +static int s6e63m0_ldi_init(struct s6e63m0 *lcd)
>> +{
>> +     int ret;
>> +
>> +     ret = s6e63m0_panel_send_sequence(lcd, SEQ_PANEL_CONDITION_SET);
>> +     ret |= s6e63m0_panel_send_sequence(lcd, SEQ_DISPLAY_CONDITION_SET);
>> +     ret |= s6e63m0_panel_send_sequence(lcd, SEQ_GAMMA_SETTING);
>> +     ret |= s6e63m0_panel_send_sequence(lcd, SEQ_ETC_CONDITION_SET);
>> +     ret |= s6e63m0_panel_send_sequence(lcd, SEQ_ACL_ON);
>> +     ret |= s6e63m0_panel_send_sequence(lcd, SEQ_ELVSS_ON);
>> +
>> +     return ret;
>> +}
>
> Well.  If one call to s6e63m0_panel_send_sequence() returns -ENOMEM and
> another call returns -EIO (for example), this function will return some
> other, incorrect errno.
>
> Which is a rather minor problem, unless some caller is explicitly
> looking for some particular error code, which doesn't happen often.
>
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