From: Jose Alonso <alonso@estadao.com.br>
I am using a pcmcia modem (linux-2.6.3) and when I unplug the
card the kernel warns:
"kernel: Trying to free nonexistent resource <000003e8-000003ef>"
The allocation of I/O address is done in:
module serial_cs:
simple_config:
pcmcia_request_io ---> allocate I/O address
setup_serial ... serial8250_request_port ---> doesn't allocate I/O
(UPF_RESOURCES is not set)
The release of I/O address is done in:
module serial_cs:
serial_remove:
unregister_serial ... serial8250_release_port ---> release I/O
pcmcia_release_io ---> release again the I/O
I suggest the patch below.
(rmk says "Yep, looks good. However, with the next round of core PCMCIA
patches, I hope to eliminate the need for UPF_RESOURCES entirely.")
---
25-akpm/drivers/serial/8250.c | 2 ++
1 files changed, 2 insertions(+)
diff -puN drivers/serial/8250.c~8250-resource-management-fix drivers/serial/8250.c
--- 25/drivers/serial/8250.c~8250-resource-management-fix 2004-03-28 13:47:00.404411976 -0800
+++ 25-akpm/drivers/serial/8250.c 2004-03-28 13:47:00.408411368 -0800
@@ -1676,6 +1676,8 @@ static void serial8250_release_port(stru
struct uart_8250_port *up = (struct uart_8250_port *)port;
unsigned long start, offset = 0, size = 0;
+ if (!(up->port.flags & UPF_RESOURCES))
+ return;
if (up->port.type == PORT_RSA) {
offset = UART_RSA_BASE << up->port.regshift;
size = 8;
_