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serial: core: Document lock requirement for UPF_* flags updates 

The flags field of struct uart_port can only be safely modified
if the port mutex is held; no other lock prevents concurrent
changes from corrupting the field.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-09-02 17:39:19 -04:00 committed by Greg Kroah-Hartman
parent 16020b989a
commit 8a949b07e4
1 changed files with 1 additions and 0 deletions
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include/linux/serial_core.h
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@ -152,6 +152,7 @@ struct uart_port {
unsigned long sysrq; /* sysrq timeout */
#endif
/* flags must be updated while holding port mutex */
upf_t flags;
#define UPF_FOURPORT ((__force upf_t) (1 << 1))