From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
(cherry picked from commit 8a949b07e4062cbd07e04e6a47249e69ca65b944)
Signed-off-by: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@xxxxxxxxx>
---
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 a8c38a1..8681f74 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -156,6 +156,7 @@ 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))
--
1.7.9.5
--
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