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@xxxxxxxxxxxxxxxxxx>
---
include/linux/serial_core.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 5bbb809..4a43292 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -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))
--
2.1.0
--
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