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The hardware for performing a cross-timestamp on E822 uses a hardware semaphore which we must acquire before initiating the cross-timestamp operation. The current implementation only attempts to acquire the semaphore once, and assumes that it will succeed. If the semaphore is busy for any reason, the cross-timestamp operation fails with -EFAULT. Instead of immediately failing, try the acquire the lock a few times with a small sleep between attempts. This ensures that most requests will go through without issue. Additionally, return -EBUSY instead of -EFAULT if the operation can't continue due to the semaphore being busy. Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel) Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> |
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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.