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authorArjan van de Ven <arjan@linux.intel.com>2010-06-17 11:02:15 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-10 13:47:39 -0700
commitd6e679b474c096f1125087e789e7af8886de39d3 (patch)
treeb24235a50fe8c6c7d640999abd02ce6ed5d91cad /Documentation/pcmcia
parent68c16b4117cc746a91897d629b61e5f2af18c225 (diff)
serial: fix wakup races in the mrst_max3110 driver
The mrst_max3110 driver had a set of unsafe wakeup sequences along the following line: if (!atomic_read(&foo)) { atomic_set(&foo, 1); wake_up(worker_thread); } and the worker thread would do if (atomic_read(&foo)) { do_work(); atomic_set(&foo, 0); } which can result in various missed wakups due to test-then-set races, as well as due to clear-after-work instead of clear-before-work. This patch fixes these races by using the proper bit test-and-set operations, and by doing clear-before-work. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/pcmcia')
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