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SubjectRe: [PATCH] ALSA: cs4236: fix return check from call to pnp_port_start
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On 11/10/18 16:42, Takashi Iwai wrote:
> On Wed, 10 Oct 2018 16:15:42 +0200,
> Colin King wrote:
>>
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> Currently the return from pnp_port_start is being checked for validity
>> by checking if it is greater or equal to zero, however, the return
>> is unsigned and hence this check is always true. An 0 return from
>> pnp_port_start is actually an error, so fix the check by checking
>> for validity when it is non-zero.
>
> I guess you're confused between mpu_port[] and mpu_irq[]?
> The check "mpu_irq[] >= 0" here is to see the module parameter value
> from user.

Yep, you are quite correct. I overlooked this. My bad.
>
>
> thanks,
>
> Takashi
>
>> Detected by CoverityScan, CID#1468334 ("Unsigned compared to 0")
>>
>> Fixes: a9824c868a2c ("[ALSA] Add CS4232 PnP BIOS support")
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>> sound/isa/cs423x/cs4236.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/sound/isa/cs423x/cs4236.c b/sound/isa/cs423x/cs4236.c
>> index 70559e59d18f..2211c39d2c18 100644
>> --- a/sound/isa/cs423x/cs4236.c
>> +++ b/sound/isa/cs423x/cs4236.c
>> @@ -292,7 +292,7 @@ static int snd_cs423x_pnp_init_mpu(int dev, struct pnp_dev *pdev)
>> mpu_irq[dev] = SNDRV_AUTO_IRQ;
>> } else {
>> mpu_port[dev] = pnp_port_start(pdev, 0);
>> - if (mpu_irq[dev] >= 0 &&
>> + if (!mpu_irq[dev] &&
>> pnp_irq_valid(pdev, 0) && pnp_irq(pdev, 0) >= 0) {
>> mpu_irq[dev] = pnp_irq(pdev, 0);
>> } else {
>> --
>> 2.17.1
>>
>>

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