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| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-09-12 16:46:51 -0500 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-10-13 09:28:57 -0400 |
| commit | c82dc88ddaf17112841dd3a6b08352968555ee08 (patch) | |
| tree | 6be63f298247641ccec9766e68a5d3a727d8a87d /drivers/scsi | |
| parent | ea2151b4e142fa2de0319d9dd80413a997bf435a (diff) | |
| download | linux-c82dc88ddaf17112841dd3a6b08352968555ee08.tar.bz2 | |
[SCSI] scsi_error: fix target reset handling
There's a target reset bug.
This loop:
for (id = 0; id <= shost->max_id; id++) {
Never terminates if shost->max_id is set to ~0, like aic94xx does.
It's also pretty inefficient since you mostly have compact target
numbers, but the max_id can be very high. The best way would be to
sort the recovery list by target id and skip them if they're equal,
but even a worst case O(N^2) traversal is probably OK here, so fix it
by finding the next highest target number (assuming n+1) and
terminating when there isn't one.
Cc: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_error.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index ad019ece2139..94ed262bdf0c 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -1065,10 +1065,10 @@ static int scsi_eh_target_reset(struct Scsi_Host *shost, struct list_head *done_q) { struct scsi_cmnd *scmd, *tgtr_scmd, *next; - unsigned int id; + unsigned int id = 0; int rtn; - for (id = 0; id <= shost->max_id; id++) { + do { tgtr_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) { if (id == scmd_id(scmd)) { @@ -1076,8 +1076,18 @@ static int scsi_eh_target_reset(struct Scsi_Host *shost, break; } } + if (!tgtr_scmd) { + /* not one exactly equal; find the next highest */ + list_for_each_entry(scmd, work_q, eh_entry) { + if (scmd_id(scmd) > id && + (!tgtr_scmd || + scmd_id(tgtr_scmd) > scmd_id(scmd))) + tgtr_scmd = scmd; + } + } if (!tgtr_scmd) - continue; + /* no more commands, that's it */ + break; SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " "to target %d\n", @@ -1096,7 +1106,8 @@ static int scsi_eh_target_reset(struct Scsi_Host *shost, " failed target: " "%d\n", current->comm, id)); - } + id++; + } while(id != 0); return list_empty(work_q); } |