ChangeSet 1.1290.15.19, 2004/03/10 11:55:07-08:00, lists@mdiehl.de [PATCH] USB: fix stack usage in pl2303 driver Arghh - while trying to follow this I just realized the pl2303 is DMA'ing to the stack - not good! Could you please just try with the patch below. I'm not sure if this might cause the MA620 trouble but it's definedly a bug and maybe it improves things for you... drivers/usb/serial/pl2303.c | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletion(-) diff -Nru a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c --- a/drivers/usb/serial/pl2303.c Wed Mar 17 15:48:27 2004 +++ b/drivers/usb/serial/pl2303.c Wed Mar 17 15:48:27 2004 @@ -390,7 +390,7 @@ { struct termios tmp_termios; struct usb_serial *serial = port->serial; - unsigned char buf[10]; + unsigned char *buf; int result; if (port_paranoia_check (port, __FUNCTION__)) @@ -401,6 +401,10 @@ usb_clear_halt(serial->dev, port->write_urb->pipe); usb_clear_halt(serial->dev, port->read_urb->pipe); + buf = kmalloc(10, GFP_KERNEL); + if (buf==NULL) + return -ENOMEM; + #define FISH(a,b,c,d) \ result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \ b, a, c, d, buf, 1, 100); \ @@ -419,6 +423,8 @@ SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1); FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0); FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0); + + kfree(buf); /* Setup termios */ if (port->tty) {