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From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: PROBLEM: serial port receive buffers not being flushed properly
Date: Fri, 27 Jul 2007 14:51:00 +
See attached .txt and .c files.
Use that information to fill in all fields of the bug report form, and
post it to the mailing list with a subject of "PROBLEM: " for easy identification by the developers.
[1.] PROBLEM: serial port receive buffers not being flushed properly
[2.] After calling tcflush() or ioctl() with the TCFLSH argument, an ioctl()
with the FIONREAD argument reports 0 bytes available for reading.
However, a subsequent select() and read() of the port returns data.
This problem is seen in 2.6.21.1 and 2.6.20, but is not seen in
version 2.6.17.14. Other versions have not been tested.
[3.] keywords: serial buffer flush
[4.] Kernel version (from /proc/version): 2.6.21.1
[5.] Most recent kernel version which did not have the bug: 2.6.17.14 (others
between 2.6.17.14 and 2.6.20 not checked)
[6.] No OOPs message applicable.
[7.] See attached source file com_buffer_test.c
[8.] Environment
[8.1.] Linux Pohaku 2.6.21.1 #1 PREEMPT Thu Jul 12 14:43:22 CDT 2007 i486
GNU/Linux
Gnu C 3.3.5
Gnu make 3.80
binutils 2.15
util-linux 2.12p
mount 2.12p
module-init-tools 3.2-pre1
e2fsprogs 1.37
pcmcia-cs 3.2.5
Linux C Library2.3.2
Dynamic linker (ldd) 2.3.2
Procps 3.2.1
Net-tools 1.60
Console-tools 0.2.3
Sh-utils 5.2.1
udev 056
Modules Loaded ipv6 e100 mii genrtc ext3 jbd ide_disk ide_generic
ns87415 piix siimage sc1200 generic cy82c693 cs5530 sis5513 via82cxxx rz1000
slc90e66 cmd64x pdc202xx_old hpt34x opti621 trm290 amd74xx hpt366 serverworks
atiixp aec62xx triflex alim15x3 pdc202xx_new cs5520 ide_core unix
[8.2.] Processor information (from /proc/cpuinfo):
processor : 0
vendor_id : AuthenticAMD
cpu family : 4
model : 9
model name : 486 DX/4-WB
stepping: 4
fdiv_bug: no
hlt_bug : no
f00f_bug: no
coma_bug: no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu
bogomips: 49.40
clflush size: 32
[8.3.] Module information (from /proc/modules):
ipv6 234848 10 - Live 0xc4c44000
e100 31632 0 - Live 0xc4bbb000
mii 5152 1 e100, Live 0xc4b83000
genrtc 9420 0 - Live 0xc4b99000
ext3 120392 1 - Live 0xc4bdf000
jbd 55976 1 ext3, Live 0xc4bac000
ide_disk 15808 2 - Live 0xc4b94000
ide_generic 1152 0 [permanent], Live 0xc4b81000
ns87415 3956 0 [permanent], Live 0xc487d000
piix 9764 0 [permanent], Live 0xc4b8a000
siimage 10912 0 [permanent], Live 0xc4b86000
sc1200 5152 0 [permanent], Live 0xc487a000
generic 4744 0 [permanent], Live 0xc4872000
cy82c693 4292 0 [permanent], Live 0xc486f000
cs5530 5056 0 [permanent], Live 0xc4867000
sis5513 14568 0 [permanent], Live 0xc4875000
via82cxxx 8676 0 [permanent], Live 0xc486b000
rz1000 2560 0 [permanent], Live 0xc482b000
slc90e66 5344 0 [permanent], Live 0xc4864000
cmd64x 10012 0 [permanent], Live 0xc4837000
pdc202xx_old 9408 0 [permanent], Live 0xc486
hpt34x 4672 0 [permanent], Live 0xc4834000
opti621 4228 0 [permanent], Live 0xc4831000
trm290 3748 0 [permanent], Live 0xc4829000
amd74xx 13308 0 [permanent], Live 0xc485b000
hpt366 15808 0 [permanent], Live 0xc4856000
serverworks 8264 0 [permanent], Live 0xc482d000
atiixp 6064 0 [permanent], Live 0xc4826000
aec62xx 7200 0 [permanent], Live 0xc4812000
triflex 3584 0 [permanent], Live 0xc481d000
alim15x3 11276 0 [permanent], Live 0xc4822000
pdc202xx_new 7744 0 [permanent], Live 0xc480c000
cs5520 4448 0 [permanent], Live 0xc480f000
ide_core 103204 27
ide_disk,ide_generic,ns87415,piix,siimage,sc1200,generic,cy82c693,cs5530,sis5513,via82cxxx,rz1000,slc90e66,cmd64x,pdc202xx_old,hpt34x,opti621,trm290,amd74xx,hpt366,serverworks,atiixp,aec62xx,triflex,alim15x3,pdc202xx_new,cs5520,
Live 0xc483b000
unix 25808 2 - Live 0xc4815000
[8.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)
-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-006f : keyboard
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
01f0-01f7 : ide0
02e8-02ef : serial
02f8-02ff : serial
03c0-03df : vesafb
03e8-03ef : serial
03f6-03f6 : ide0
03f8-03ff : serial
0cf8-0cff : PCI conf1
f900-f9ff : :00:11.0
fd00-fd3f : :00:10.0
fd00-fd3f : e100
-0009e3ff : System RAM
0009e400-0009 : reserved
000a-000b : Video RAM area
000c-000c : Video ROM
000f-000f : System ROM
0010-03ff : System RAM
0010-0026df65 : Kernel code