tree bbeba425693062ad38bc13f73ec8d0f5744f26e2
parent 5c554e6b984ce6b36488b93a7ec8e2752233e7cb
author Arjan van de Ven <arjan@linux.intel.com> 1214164982 -0300
committer Mauro Carvalho Chehab <mchehab@infradead.org> 1214506739 -0300

V4L/DVB (8108): Fix open/close race in saa7134

The saa7134 driver uses a (non-atomic) variable in an attempt to
only allow one opener of the device (how it deals with sending
the fd over unix sockets I don't know).

Unfortunately, the release function first decrements this variable,
and THEN goes on to disable more of the device. This allows for
a race where another opener of the device comes in after the decrement of
the variable, configures the hardware just to then see the hardware
be disabled by the rest of the release function.

This patch makes the release function use the same lock as the open
function to protect the hardware as well as the variable (which now
at least has some locking to protect it).

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>