greybus: es2: test apb1_log_task safely

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When usb_log_enable() is called, the global apb1_log_task is used to
hold the result of kthread_run().  It is possible for kthread_run()
to return an error pointer, so tests of apb_log_task against NULL
are insufficient to determine its validity.

Note that kthread_run() never returns NULL so we don't have to check
for that.  But apb1_log_task is initially NULL, so that global must
be both non-null and not an error in order to be considered valid.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

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Alex Elder 2015-03-27 15:20:49 -05:00 • committed by Greg Kroah-Hartman

parent dada3b02a3

commit e0feaf14b1

1 changed files with 4 additions and 4 deletions

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drivers/staging/greybus/es2.c

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