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: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
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:
[EMAIL PROTECTED] compiler]# setserial /dev/ttyS0
/dev/ttyS0, UART: unknown, Port: 0x03f8, IRQ: 4
On 2.6.27:
[EMAIL PROTECTED] 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”
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