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49769d4d35
When use one SDIO wifi which enable the runtime PM feature on i.MX6SX, we meet system hang. This hang happened during the usdhc runtime resume, in sdhci_init(), when call the sdhci_set_default_irqs. One interrupt (SDHCI_INT_CARD_INT) triggered just after the host->ier update and before the write of register SDHCI_SIGNAL_ENABLE. So in sdhci_irq, it will skip the call of sdio_signal_irq() because current host->ier do not set the SDHCI_INT_CARD_INT. So this SDIO wifi interrupt always keep triggered, let the system stuck in irq handle, can't response any other thread. This patch add spin lock for the sdhci_set_default_irqs to fix this issue. Signed-off-by: Haibo Chen <haibo.chen@nxp.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Link: https://lore.kernel.org/r/1586941255-9237-1-git-send-email-haibo.chen@nxp.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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.