Issue while oops and panic message logging to MTD partition

[Jagdish Gediya]

Hi,

Setup details:
Board - Freescale ls1046ardb(ARM64)
MTD device - nand(IFC)

CONFIG_MTD_OOPS is enabled to collect oops and panic logs. 
Added bootargs to collect logs : mtdoops.mtddev=3 mtdoops.record_size=16384

Issue:
Kernel hangs during oops log collection in function :fsl_ifc_run_command".
Below is the code location where it hangs exactly,

/*
 * execute IFC NAND command and wait for it to complete
 */
static void fsl_ifc_run_command(struct mtd_info *mtd)
{		.
		.
		.
		.
		.

        /* wait for command complete flag or timeout */
        wait_event_timeout(ctrl->nand_wait, ctrl->nand_stat,
                           msecs_to_jiffies(IFC_TIMEOUT_MSECS));

		.
		.
		.
		.
}

"wait_event_timeout" is the exact culrit where kernel hangs. As panic(...) disables the local interrupt by calling local_irq_disable(),
It looks like behavior is expected because timer interrupts are disabled and because of that "wait_event_timeout" hangs forever.

The odd behaviour is sometimes "wait_event_timeout" does not hang. The reason could be being a multicore processor, some other core would receive the
timer interrupt and as a result "wait_event_timeout" gets unblocked.

How the other driver accomplish the timer replated work if any during the panic path or in general when local interrupts are disabled?

Thanks,
Jagdish