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Subject[PATCH v2] tty: serial: Use GFP_ATOMIC instead of GFP_KERNEL in serial8250_em485_init()
Date
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 <torso.nafi@gmail.com>
Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru>
---
Changes from v1:
- Properly filled Reported-by: tag

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 c908b77..4d6deef 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -586,7 +586,7 @@ 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;

--
2.7.0
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