Jeff Garzik wrote:
Some hardware seems to get this wrong in a non-harmful way, and there
are
some devices that seem to do it deliberately for various reasons.
Just take it as a device error not a catastrophic state machine
explosion.
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
diff -u --exclude-from /usr/src/exclude --new-file --recursive
linux.vanilla-2.6.23-mm1/drivers/ata/libata-core.c
linux-2.6.23-mm1/drivers/ata/libata-core.c
--- linux.vanilla-2.6.23-mm1/drivers/ata/libata-core.c 2007-10-15
15:03:26.000000000 +0100
+++ linux-2.6.23-mm1/drivers/ata/libata-core.c 2007-10-15
15:13:49.000000000 +0100
@@ -5258,7 +5319,15 @@
if (unlikely(status & (ATA_ERR | ATA_DF))) {
ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
"error, dev_stat 0x%X\n", status);
- qc->err_mask |= AC_ERR_HSM;
+ /* Some devices muck this up. Some follow an ATA
+ non-standard that permits the damaged sector to
+ be retrieved at this point. The ATA spec says
+ we should jump up and down on DRQ + ERR, reality
I've always thought that setting both DRQ and ERR is perfectly
valid (well, maybe it's become invalid since ATAPI-4 where all these
state transition flow charts have made its first appearance, to be
quickly replaced by the state diagrams :-) -- I'm too lazy to check
now... :-)
DRQ+ERR is valid, and SRST (or hard reset) is defined as the method of
kicking the device out of that state.
Well, in the times of old, reading a sector (or group of them for multiple
mode) was valid for that purpose, wasn't it?
Jeff
MBR, Sergei
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