> On Aug 25, 2015, at 16:07, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> On Tue, 25 Aug 2015, yalin wang wrote:
>> Change ipu_irq_handler() to avoid gcc warning:
>>
>> drivers/dma/ipu/ipu_irq.c:305:4: warning: 'irq' may be used
>> uninitialized in this function [-Wmaybe-uninitialized]
>> generic_handle_irq(irq);
>
> That's a false positive from GCC. irq is always initialized when
> generic_handle_irq() is called.
>
>> Signed-off-by: yalin wang <yalin.wang2010@xxxxxxxxx>
>> ---
>> drivers/dma/ipu/ipu_irq.c | 6 ++----
>> 1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/dma/ipu/ipu_irq.c b/drivers/dma/ipu/ipu_irq.c
>> index 7489d2a..1a74eee 100644
>> --- a/drivers/dma/ipu/ipu_irq.c
>> +++ b/drivers/dma/ipu/ipu_irq.c
>> @@ -286,23 +286,21 @@ static void ipu_irq_handler(unsigned int __irq, struct irq_desc *desc)
>> raw_spin_unlock(&bank_lock);
>> while ((line = ffs(status))) {
>> struct ipu_irq_map *map;
>> - unsigned int irq;
>>
>> line--;
>> status &= ~(1UL << line);
>>
>> raw_spin_lock(&bank_lock);
>> map = src2map(32 * i + line);
>> - if (map)
>> - irq = map->irq;
>> raw_spin_unlock(&bank_lock);
>>
>> if (!map) {
>> pr_err("IPU: Interrupt on unmapped source %u bank %d\n",
>> line, i);
>> continue;
>> + } else {
>> + generic_handle_irq(map->irq);
>
> So you change that from retrieving the irq number with bank lock held
> to an unprotected access.
i see,
i will send a V2 patch .
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