openkylin
/
platform_kernel-5.15
mirror of https://gitee.com/openkylin/platform_kernel-5.15.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

USB: serial: ftdi_sio: don't access latency timer on old chips 

The latency timer was introduced with the FT232BM and FT245BM chips.  Do
not bother attempting to read or write it for older chip versions.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ian Abbott 2017-03-08 16:02:57 +00:00 committed by Johan Hovold
parent 4495c08e84
commit 2dea7cd728
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/serial/ftdi_sio.c
View File

@ -1406,6 +1406,9 @@ static int write_latency_timer(struct usb_serial_port *port)
int rv;
int l = priv->latency;
if (priv->chip_type == SIO || priv->chip_type == FT8U232AM)
return -EINVAL;
if (priv->flags & ASYNC_LOW_LATENCY)
l = 1;
@ -1429,6 +1432,9 @@ static int read_latency_timer(struct usb_serial_port *port)
unsigned char *buf;
int rv;
if (priv->chip_type == SIO || priv->chip_type == FT8U232AM)
return -EINVAL;
buf = kmalloc(1, GFP_KERNEL);
if (!buf)
return -ENOMEM;