genirq: Add IRQF_NO_AUTOEN for request_irq/nmi()

stable inclusion
from stable-v5.10.163
commit 50aaa6b1742cb26f718bc72f4196aaf6a4efa7a7
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9E6TU
CVE: CVE-2024-27437

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=50aaa6b1742cb26f718bc72f4196aaf6a4efa7a7



--------------------------------

[ Upstream commit cbe16f35 ]

Many drivers don't want interrupts enabled automatically via request_irq().
So they are handling this issue by either way of the below two:

(1)
  irq_set_status_flags(irq, IRQ_NOAUTOEN);
  request_irq(dev, irq...);

(2)
  request_irq(dev, irq...);
  disable_irq(irq);

The code in the second way is silly and unsafe. In the small time gap
between request_irq() and disable_irq(), interrupts can still come.

The code in the first way is safe though it's subobtimal.

Add a new IRQF_NO_AUTOEN flag which can be handed in by drivers to
request_irq() and request_nmi(). It prevents the automatic enabling of the
requested interrupt/nmi in the same safe way as #1 above. With that the
various usage sites of #1 and #2 above can be simplified and corrected.

Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: dmitry.torokhov@gmail.com
Link: https://lore.kernel.org/r/20210302224916.13980-2-song.bao.hua@hisilicon.com


Stable-dep-of: 99c05e42 ("iio: adis: add '__adis_enable_irq()' implementation")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>