greybus: svc: fix racy hotplug handling

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Fix racy hotplug handling by serialising all processing of hot-plug and
unplug requests using a single-threaded dedicated workqueue.

This fixes a reported crash during enumeration when processing multiple
events.

The current svc implementation does not handle concurrency at all (e.g.
no interface list lock or refcounting) so we need to use the big hammer
for now.

Note that we will eventually want to process events for different
interfaces in parallel, but that we'd still need a workqueue in order
not to starve other svc requests (e.g. for timesync).

Reported-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

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This commit is contained in:

Johan Hovold 2015-12-02 18:23:31 +01:00 • committed by Greg Kroah-Hartman

parent 57ccd4b087

commit 3e48acac26

2 changed files with 11 additions and 2 deletions

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12

drivers/staging/greybus/svc.c

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1

drivers/staging/greybus/svc.h

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