From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shan Wei Subject: Re: [Bugme-new] [Bug 12056] New: the serial device(ttyS0) is unuseable after booting the kernel Date: Tue, 18 Nov 2008 11:04:15 +0800 Message-ID: <492230AF.6050200@cn.fujitsu.com> References: <20081117185309.68d19017.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:59489 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751867AbYKRDOE (ORCPT ); Mon, 17 Nov 2008 22:14:04 -0500 In-Reply-To: <20081117185309.68d19017.akpm@linux-foundation.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Yasunori Goto Cc: Andrew Morton , linux-acpi@vger.kernel.org, Zhao Yakui , Li Shaohua , Zhang Rui , Len Brown , bugme-daemon@bugzilla.kernel.org =E4=BA=94=E5=B3=B6=E6=AE=BF Forward the mail to you. If i miss something, welcome you comment. Andrew Morton says: > (switched to email. Please respond via emailed reply-to-all, not via= the > bugzilla web interface). >=20 > On Mon, 17 Nov 2008 18:44:44 -0800 (PST) bugme-daemon@bugzilla.kernel= =2Eorg wrote: >=20 >> http://bugzilla.kernel.org/show_bug.cgi?id=3D12056 >> >> Summary: the serial device(ttyS0) is unuseable after boot= ing 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@kernel-bugs.osdl.org >> ReportedBy: shanwei@cn.fujitsu.com >> >> >> 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=20 >> (ttyS0) is unused. But on 2.6.27, it's ok.=20 >> >> 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 39a0ad871000d2a016a4fa113a6e53d2= 2aabf25d___ >> For the device that is not present but functional, it unload the dri= ver for the >> device.=20 >> 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 =3D acpi_get_handle(device->handle, "_CRS", &temp); >> if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(dev= ice)) || >> - is_exclusive_device(device) || (!device->status.present)= ) >> + is_exclusive_device(device)) >> return 0; >> >> dev =3D pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hi= d(device)); >> >> Steps to reproduce: >> 1)build the kernel of 2.6.28-rc3; >> 2)check the device with ___setserial /dev/ttyS0___ >> >> >=20 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html