* [BUG] bug in mmap_kmem
@ 2001-06-19 10:34 Yoav Etsion
2001-06-19 11:00 ` Scsi Dead2
0 siblings, 1 reply; 2+ messages in thread
From: Yoav Etsion @ 2001-06-19 10:34 UTC (permalink / raw)
To: Linux Kernel Mailing List; +Cc: Tsafrir Dan
Hi,
The problem is that mmaping a segment <addr,len> from /dev/kmem gives
differnet results than reading the same <addr,len>.
It seems that the bug is that mmap_kmem is a macro for mmap_mem (for
/dev/mem).
mmap_mem maps a _physical_ offset into a vm area vma, while mmap_kmem
should map a _virtual_ offset into a vm area.
I hacked it to work by copying mmap_mem to mmap_kmem and adding __pa() in
the proper assginment, but I don't know how to check if the offset is
valid in the kernel virtual memory. Maybe someone who knows the mm code
better can fix this?
Thanks,
Yoav Etsion
^ permalink raw reply [flat|nested] 2+ messages in thread
* Scsi
2001-06-19 10:34 [BUG] bug in mmap_kmem Yoav Etsion
@ 2001-06-19 11:00 ` Dead2
0 siblings, 0 replies; 2+ messages in thread
From: Dead2 @ 2001-06-19 11:00 UTC (permalink / raw)
To: Linux Kernel Mailing List
Attached below: original mail to the 'linux-scsi' list
Please read attachment first.
It seems that the Davicom NIC's is the problem in this system.
I have tried to swap them with new davicom cards, and tried
with only one of them.
Davicom DM9102AF is the chip on all the cards.
Adaptec SCSI 19160 Ultra160, 68/50pin (7892B, rev2)
I changed the Davicom's with Intel cards (same IRQ), and now it works
flawlessly. I think this might be an error worth looking at..
Hans K. Rosbach aka. Dead2
CircleStorm Productions
-START ATTACHMENT-
Hi, i'm getting the following errors constantly while accessing my scsi disk
(10x per second or more)
"Kernel: scsi0: PCI error Interrupt at seqaddr = 0x*"
"Kernel: scsi0: Data Parity Error Detected during address or write data
phase"
(where * is a number, most often 8 or 9)
I'm running Kernel 2.4.6pre1 (also got it with 2.4.5)
Worked fine with the distro's kernel 2.4.0
Hardware:
Adaptec SCSI 19160 Ultra160, 68/50pin (7892B, rev2)
MSI K7T-PRO2 motherboard (VIA chipset)
Amd Duron 750Mhz cpu
Winbond SDRAM (7ns)
2x Davicom PCI 10/100 cards
ATI 3D Rage IIc AGP
The computer is running SuSE 7.1 without X or other fancy
packages, as it is going to run a squid cache server.
The Scsi drivers are compiled into the kernel.
Hans K. Rosbach aka. Dead2
CircleStorm Productions
-END ATTACHMENT-
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2001-06-19 10:34 [BUG] bug in mmap_kmem Yoav Etsion
2001-06-19 11:00 ` Scsi Dead2
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