Messages in this thread | | | From | "Jaewon Kim" <> | Subject | RE: [PATCH 1/1] tty: serial: samsung: add spin_lock for interrupt and console_write | Date | Wed, 6 Apr 2022 17:39:11 +0900 |
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Hello
On 22. 4. 6. 17:21, Greg Kroah-Hartman wrote: > On Wed, Apr 06, 2022 at 05:22:16PM +0900, Jaewon Kim wrote: > > The console_write and IRQ handler can run concurrently. > > Problems may occurs console_write is continuously executed while the > > IRQ handler is running. > > > > Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com> > > --- > > drivers/tty/serial/samsung_tty.c | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/drivers/tty/serial/samsung_tty.c > > b/drivers/tty/serial/samsung_tty.c > > index e1585fbae909..9db479d728b5 100644 > > --- a/drivers/tty/serial/samsung_tty.c > > +++ b/drivers/tty/serial/samsung_tty.c > > @@ -2480,12 +2480,24 @@ s3c24xx_serial_console_write(struct console *co, const char *s, > > unsigned int count) > > { > > unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON); > > + unsigned long flags; > > + bool locked = 1; > > "1" is not a boolean :)
return value of spin_trylock() is 1 or 0. It seems better to keep it as an int than to change it to bool. I will return it to int.
Thanks Jaewon Kim
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