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e594443196
Channel device_node deletion is managed by the device driver rather than
the dmaengine core. The deletion was accidentally introduced when making
channel unregister dynamic. It causes xilinx_dma module to crash on unload
as reported by Radhey. Remove chan->device_node delete in dmaengine and
also fix up idxd driver.
[ 42.142705] Internal error: Oops: 96000044 [#1] SMP
[ 42.147566] Modules linked in: xilinx_dma(-) clk_xlnx_clock_wizard uio_pdrv_genirq
[ 42.155139] CPU: 1 PID: 2075 Comm: rmmod Not tainted 5.10.1-00026-g3a2e6dd7a05-dirty #192
[ 42.163302] Hardware name: Enclustra XU5 SOM (DT)
[ 42.167992] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--)
[ 42.173996] pc : xilinx_dma_chan_remove+0x74/0xa0 [xilinx_dma]
[ 42.179815] lr : xilinx_dma_chan_remove+0x70/0xa0 [xilinx_dma]
[ 42.185636] sp : ffffffc01112bca0
[ 42.188935] x29: ffffffc01112bca0 x28: ffffff80402ea640
xilinx_dma_chan_remove+0x74/0xa0:
__list_del at ./include/linux/list.h:112 (inlined by)
__list_del_entry at./include/linux/list.h:135 (inlined by)
list_del at ./include/linux/list.h:146 (inlined by)
xilinx_dma_chan_remove at drivers/dma/xilinx/xilinx_dma.c:2546
Fixes: e81274cd6b ("dmaengine: add support to dynamic register/unregister of channels")
Reported-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/161099092469.2495902.5064826526660062342.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Cc: stable@vger.kernel.org # 5.9+
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
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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
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