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[SCSI] Negotiate correctly with async-only devices 

When we got a device only capable of async, we would zero out goal->period
which would cause us to try PPR negotiations.  Leave goal->period alone,
and check goal->offset before doing PPR.  Kudos to Daniel Forsgren for
figuring this out.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Matthew Wilcox 2005-11-29 23:08:40 -05:00 committed by James Bottomley
parent 1a68de5c08
commit 322e079f1b
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/sym53c8xx_2/sym_hipd.c
View File

@ -1405,7 +1405,6 @@ static void sym_check_goals(struct sym_hcb *np, struct scsi_target *starget,
goal->iu = 0;
goal->dt = 0;
goal->qas = 0;
goal->period = 0;
goal->offset = 0;
return;
}
@ -1465,7 +1464,8 @@ static int sym_prepare_nego(struct sym_hcb *np, struct sym_ccb *cp, u_char *msgp
* Many devices implement PPR in a buggy way, so only use it if we
* really want to.
*/
if (goal->iu || goal->dt || goal->qas || (goal->period < 0xa)) {
if (goal->offset &&
(goal->iu || goal->dt || goal->qas || (goal->period < 0xa))) {
nego = NS_PPR;
} else if (spi_width(starget) != goal->width) {
nego = NS_WIDE;