From: "Matwey V. Kornilov"
serial8250_em485_init() is supposed to be protected with
p->port.lock spinlock.
This may lead to issues when kmalloc sleeps, so it is better to use
GFP_ATOMIC in this spinlocked context.
Fixes: e490c9144cfa ("tty: Add software emulated RS485 support for 8250")
Reported-by: Ильяс Гасанов
Signed-off-by: Matwey V. Kornilov
Signed-off-by: Greg Kroah-Hartman
Patch-mainline: v4.6
Git-commit: b18a183eaac25bd8dc51eab85437c7253f5c31d1
Signed-off-by: Matwey V. Kornilov
---
drivers/tty/serial/8250/8250_port.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 8f2d439..9f7fb04 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -570,7 +570,7 @@ int serial8250_em485_init(struct uart_8250_port *p)
if (p->em485 != NULL)
return 0;
- p->em485 = kmalloc(sizeof(struct uart_8250_em485), GFP_KERNEL);
+ p->em485 = kmalloc(sizeof(struct uart_8250_em485), GFP_ATOMIC);
if (p->em485 == NULL)
return -ENOMEM;
--
2.1.4
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