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When we shut down the device (i.e., during 'reset'), we cancel any
outstanding work, but we don't clear any work-related flags. This can
cause problems if, e.g., we begin to queue a new firmware dump or card
reset while the other one is in progress. That might leave work_flags
with a stale value, and we might begin one of these *after* we've
completely reset the device. That doesn't make sense, because all
firmware context will have been lost by then.
This fixes some forms of cascading failures, where I:
(a) force a firmware dump (cat /sys/kernel/debug/mwifiex/mlan0/device_dump)
(b) run a Wifi scan in parallel (iw mlan0 scan)
(c) the scan times out due to (a) hogging the interface
(d) the command timeout triggers another firmware dump and a reset [*]
(e) the 2nd firmware dump flag persists across the reset
(f) as soon as the interface comes back up, we trigger the pending
firmware dump
(g) subsequent commands time out again, while we are processing the
firmware dump; return to (d)
[*] Note that automatic card_reset() support is not yet implemented for
the mwifiex PCIe driver, so we won't hit *exactly* this behavior yet.
But we can see similarly-confusing behaviors today.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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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.