linux-kernel - Add UPF_FIXED_TYPE flag - eedacbf02df462d6c915d8d642b23fb450d485c7

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Date:	Mon, 23 Nov 2009 17:53:21 +0100
From:	Michal Simek <monstr@...str.eu>
To:	benh@...nel.crashing.org, dmitchell@...c.com
CC:	Grant Likely <grant.likely@...retlab.ca>,
	John Williams <john.williams@...alogix.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Add UPF_FIXED_TYPE flag - eedacbf02df462d6c915d8d642b23fb450d485c7

Hi Ben and David,

I have found one problem with input overrun. My problem is of course on 
Microblaze with uart16550.

Here is the behavior - I just pressed left arrow.

~ # fdasfdakjsdhfkajsdhfkjadklasdjfhajksdhfkahsdfjkahsdkjfhjkattyS0: 3 
input overrun(s)
[[DttyS0: 3 input overrun(s)
[[[[[DDDahsdk[[[[D[DDjfhjka[D          [[[DttyS0: 6 input 
overrun(s)jk[[D[D[[D[[
[[[[D[Dsd[[Dhfkah[[[[DD[[DDsdfjk[[D[D[[[[D[[[D[Dsd[[Dhfkah[[[[DD[[DDsdfjk[[D[D[[
D[[[[DDDahsdk[[[[D[DDjfhjka[D
-sh: 
fdasfdakjsdhfkajsdhfkjadklasdjfhajk[[D[[[D[Dsd[[Dhfkah[[[[DD[[DDsdfjk[[D[D[[D[[[[DDDahsdk[[[[D[DDjfhjka[D: 
not found


I bisected it and yours Subject patch caused my problems. It is really 
old patch and I was surprised how old it is.


Here is your diff
diff --git a/drivers/serial/of_serial.c b/drivers/serial/of_serial.c
index 02406ba..54483cd 100644
--- a/drivers/serial/of_serial.c
+++ b/drivers/serial/of_serial.c
@@ -67,7 +67,7 @@ static int __devinit of_platform_serial_setup(struct 
of_device *ofdev,
         port->type = type;
         port->uartclk = *clk;
         port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
-               | UPF_FIXED_PORT | UPF_FIXED_TYPE;
+               | UPF_FIXED_PORT;
         port->dev = &ofdev->dev;
         /* If current-speed was set, then try not to change it. */
         if (spd)


If I trace port->type I am getting 3. (drivers/serial/8250.c:3089 
serial8250_register_port func 3118 - serial8250_register_port)
Grant: Could you please print that value on ppc?

Can you give me any hints what could be wrong? I will continue on it 
tomorrow.

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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