redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

serial: stm32: fix a recursive locking in stm32_config_rs485 

Remove spin_lock_irqsave in stm32_config_rs485, it cause recursive locking.
Already locked in uart_set_rs485_config.

Fixes: 1bcda09d29 ("serial: stm32: add support for RS485 hardware control mode")
Signed-off-by: Borut Seljak <borut.seljak@t-2.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Borut Seljak 2019-06-07 12:53:06 +02:00 committed by Greg Kroah-Hartman
parent 87bb008c77
commit 707aeea13a
1 changed files with 0 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/tty/serial/stm32-usart.c
View File

@ -105,9 +105,7 @@ static int stm32_config_rs485(struct uart_port *port,
struct stm32_usart_config *cfg = &stm32_port->info->cfg;
u32 usartdiv, baud, cr1, cr3;
bool over8;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
port->rs485 = *rs485conf;
@ -147,7 +145,6 @@ static int stm32_config_rs485(struct uart_port *port,
}
stm32_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
spin_unlock_irqrestore(&port->lock, flags);
return 0;
}