(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Mon, 17 Nov 2008 18:44:44 -0800 (PST) bugme-daemon@xxxxxxxxxxxxxxxxxxx wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=12056 > > Summary: the serial device(ttyS0) is unuseable after booting the > kernel > Product: ACPI > Version: 2.5 > KernelVersion: 2.6.28-rc3 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: blocking > Priority: P1 > Component: ACPICA-Core > AssignedTo: acpi_acpica-core@xxxxxxxxxxxxxxxxxxxx > ReportedBy: shanwei@xxxxxxxxxxxxxx > > > Latest working kernel version:2.6.28-rc3 > Earliest failing kernel version:2.6.28-rc1 > Distribution: > Hardware Environment:fujitsu's PG > Software Environment: > Problem Description: > > When i switch to the kernel of 2.6.28-rc3, the serial device > (ttyS0) is unused. But on 2.6.27, it's ok. > > On 2.6.28-rc3: > [root@DaVid compiler]# setserial /dev/ttyS0 > /dev/ttyS0, UART: unknown, Port: 0x03f8, IRQ: 4 > > On 2.6.27: > [root@DaVid compiler]# setserial /dev/ttyS0 > /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 > > The problem comes from this patch 39a0ad871000d2a016a4fa113a6e53d22aabf25d___ > For the device that is not present but functional, it unload the driver for the > device. > In the following patch, I try to fix it whthout check the present bit when > adding device. After applied the patch, the serial device is useable again. > > diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c > index 383e47c..bcc731b 100644 > --- a/drivers/pnp/pnpacpi/core.c > +++ b/drivers/pnp/pnpacpi/core.c > @@ -154,7 +154,7 @@ static int __init pnpacpi_add_device(struct acpi_device > *device) > */ > status = acpi_get_handle(device->handle, "_CRS", &temp); > if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) || > - is_exclusive_device(device) || (!device->status.present)) > + is_exclusive_device(device)) > return 0; > > dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device)); > > Steps to reproduce: > 1)build the kernel of 2.6.28-rc3; > 2)check the device with ___setserial /dev/ttyS0___ > > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
