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9b2aef128b
If i40evf_open() is called quickly at the same time as a reset occurs (such as via ethtool) it is possible for the device to attempt to open while a reset is in progress. This occurs because the driver was not holding the critical task bit lock during i40evf_open, nor was it holding it around the call to i40evf_up_complete() in i40evf_reset_task(). We didn't hold the lock previously because calls to i40evf_down() would take the bit lock directly, and this would have caused a deadlock. To avoid this, we'll move the bit lock handling out of i40evf_down() and into the callers of this function. Additionally, we'll now hold the bit lock over the entire set of steps when going up or down, to ensure that we remain consistent. Ultimately this causes us to serialize the transitions between down and up properly, and avoid changing status while we're resetting. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.