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author | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2013-08-23 17:03:44 +0200 |
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committer | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2013-12-04 17:19:36 +0100 |
commit | 3a3d2b0551d79ef476ef57424beeb8f68789fbcd (patch) | |
tree | 8dd517d6650876376d1d4e18b605b56fc59ace4b /README | |
parent | d6782c263661abd6c7e8a375141d69fdc457f9e1 (diff) | |
download | linux-stable-3a3d2b0551d79ef476ef57424beeb8f68789fbcd.tar.gz linux-stable-3a3d2b0551d79ef476ef57424beeb8f68789fbcd.tar.bz2 linux-stable-3a3d2b0551d79ef476ef57424beeb8f68789fbcd.zip |
clkdev: Fix race condition in clock lookup from device tree
There is currently a race condition in the device tree part of clk_get()
function, since the pointer returned from of_clk_get_by_name() may become
invalid before __clk_get() call. E.g. due to the clock provider driver
remove() callback being called in between of_clk_get_by_name() and
__clk_get().
Fix this by doing both the look up and __clk_get() operations with the
clock providers list mutex held. This ensures that the clock pointer
returned from __of_clk_get_from_provider() call and passed to __clk_get()
is valid, as long as the clock supplier module first removes its clock
provider instance and then does clk_unregister() on the corresponding
clocks.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Mike Turquette <mturquette@linaro.org>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions