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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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8
include/scsi/scsi_cmnd.h
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@@ -51,12 +51,16 @@ struct scsi_cmnd {
* printk's to use ->pid, so that we can kill this field.
*/
unsigned long serial_number;
/*
* This is set to jiffies as it was when the command was first
* allocated. It is used to time how long the command has
* been outstanding
*/
unsigned long jiffies_at_alloc;
int retries;
int allowed;
int timeout_per_command;
int timeout_total;
int timeout;
unsigned char cmd_len;
unsigned char old_cmd_len;