On Sat, Jan 29, 2022 at 08:16:04AM +0100, Christophe JAILLET wrote:
> The error handling path of mpc52xx_lpbfifo_probe() and a request_irq() is
> not balanced by a corresponding free_irq().
>
> Add the missing call, as already done in the remove function.
>
> Fixes: 3c9059d79f5e ("powerpc/5200: add LocalPlus bus FIFO device driver")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> ---
> Another strange thing is that the remove function has:
> /* Release the bestcomm transmit task */
> free_irq(bcom_get_task_irq(lpbfifo.bcom_tx_task), &lpbfifo);
> but I've not been able to find a corresponding request_irq().
>
> Is it dead code? Is there something missing in the probe?
> (...Is it working?...)
I think you're right that the tx_task IRQ is never allocated.
I'm pretty sure that if you free a zero IRQ then it's a no-op. It won't
find the 0 in the radix tree so irq_to_desc() returns NULL and free_irq()
returns early.
regards,
dan carpenter
