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During suspend flow, interrupt shall be disabled before disabling clocks to avoid potential system hang due to accessing host registers after host clocks are disabled. For example, if an interrupt comes with IRQF_IRQPOLL flag configured with the misrouted interrupt recovery feature enabled, ufshcd ISR may be triggered even if nothing shall be done for UFS. In this case, system hang may happen if UFS interrupt status register is accessed with host clocks disabled. Link: https://lore.kernel.org/r/1575721321-8071-2-git-send-email-stanley.chu@mediatek.com Reviewed-by: Avri Altman <avri.altman@wdc.com> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.