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[SCSI] add global timeout to the scsi mid-layer

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There are certain rogue devices (and the aic7xxx driver) that return
BUSY or QUEUE_FULL forever.  This code will apply a global timeout (of
the total number of retries times the per command timer) to a given
command.  If it is exceeded, the command is completed regardless of its
state.

The patch also removes the unused field in the command: timeout and
timeout_total.

This solves the problem of detecting an endless loop in the mid-layer
because of BUSY/QUEUE_FULL bouncing, but will not recover the device.
In the aic7xxx case, the driver can be recovered by sending a bus reset,
so possibly this should be tied into the error handler?

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley
2005-08-05 21:45:40 -05:00
committed by James Bottomley
parent f03a567054
commit b21a413851
3 changed files with 23 additions and 4 deletions
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4
drivers/scsi/advansys.c
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@@ -9200,8 +9200,8 @@ asc_prt_scsi_cmnd(struct scsi_cmnd *s)
(unsigned) s->serial_number, s->retries, s->allowed);
printk(
" timeout_per_command %d, timeout_total %d, timeout %d\n",
s->timeout_per_command, s->timeout_total, s->timeout);
" timeout_per_command %d\n",
s->timeout_per_command);
printk(
" scsi_done 0x%lx, done 0x%lx, host_scribble 0x%lx, result 0x%x\n",