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Modular test showed a bug in ufs_rockchip_remove which looks like: [ 23.132276][ T844] ufshcd-rockchip 2a2d0000.ufs: Unbalanced pm_runtime_enable! [ 23.133411][ T217] ueventd: restorecon_recursive: /sys/devices/platform/2a2d0000.ufs [ 23.141741][ T80] platform 2a2d0000.ufs: uic cmd 0x16 with arg3 0x0 completion timeout [ 23.141749][ T10] platform 2a2d0000.ufs: uic cmd 0x14 with arg3 0x0 completion timeout [ 23.141772][ T10] platform 2a2d0000.ufs: dme-reset: error code -110 [ 23.141775][ T10] platform 2a2d0000.ufs: DME_RESET failed [ 23.141779][ T10] platform 2a2d0000.ufs: link startup failed -110 [ 23.141782][ T10] platform 2a2d0000.ufs: UFS Host state=0 [ 23.141785][ T10] platform 2a2d0000.ufs: outstanding reqs=0x0 tasks=0x0 [ 23.141789][ T10] platform 2a2d0000.ufs: saved_err=0x0, saved_uic_err=0x0 [ 23.141800][ T10] platform 2a2d0000.ufs: Device power mode=1, UIC link state=0 [ 23.141801][ T80] Unable to handle kernel paging request at virtual address ffffffc00f170034 [ 23.141804][ T80] Mem abort info: [ 23.147077][ T10] platform 2a2d0000.ufs: PM in progress=0, sys. suspended=0 [ 23.147829][ T80] ESR = 0x0000000096000007 [ 23.148134][ T10] platform 2a2d0000.ufs: Auto BKOPS=0, Host self-block=0 [ 23.148752][ T80] EC = 0x25: DABT (current EL), IL = 32 bits This can be triggered by: while true do echo "2a2d0000.ufs" > /sys/bus/platform/drivers/ufshcd-rockchip/unbind; sleep 2; echo "2a2d0000.ufs" > /sys/bus/platform/drivers/ufshcd-rockchip/bind; sleep 2; done Also we leave reference clk ungate if ufs is removed. Fix them all together. Change-Id: I785a7c196ddacf2fb51eba441bcdb288441f9c30 Signed-off-by: Shawn Lin <shawn.lin@rock-chips.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.