V4L/DVB (7711): pvrusb2: Fix race on module unload

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The pvrusb2 driver - for basically forever - was not enforcing a
proper module tear-down.  Kernel threads are used inside the driver
and all must be gone before the module can be safely removed.  This
changeset reimplements a chunk of pvrusb2-context.c to enforce this
correctly.  Unfortunately this is not a simple fix.  The new
implementation also cuts back on kernel thread usage; instead of there
being 1 control thread per instance now it's just 1 control thread
shared by all instances.  (By dropping to a single thread then the
module exit function can block on its shutdown and the thread itself
can monitor and cleanly shut down all of the other instances first.)

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

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This commit is contained in:

Mike Isely 2008-04-07 02:22:04 -03:00 • committed by Mauro Carvalho Chehab

parent d913d63030

commit e5be15c638

3 changed files with 174 additions and 51 deletions

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204

drivers/media/video/pvrusb2/pvrusb2-context.c

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9

drivers/media/video/pvrusb2/pvrusb2-context.h

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12

drivers/media/video/pvrusb2/pvrusb2-main.c

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