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[ Upstream commitdef4cd43f5] Currently, polling a umad device will always works, even if the device was disassociated. A disassociated device should immediately return EPOLLERR from poll(). Otherwise userspace is endlessly hung on poll() with no idea that the device has been removed from the system. Fixes:1da177e4c3("Linux-2.6.12-rc2") Link: https://lore.kernel.org/r/20210125121339.837518-3-leon@kernel.org Signed-off-by: Shay Drory <shayd@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Sasha Levin <sashal@kernel.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.