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[SCSI] expose eh_timed_out to the host template 

It looks like megaraid_sas at least needs this to throttle its commands
as they begin to time out.  The code keeps the existing transport
template use of eh_timed_out (and allows the transport to override the
host if they both have this callback).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2007-03-16 17:44:41 -05:00 committed by James Bottomley
parent 03d4433721
commit 6c5f8ce1fb
2 changed files with 23 additions and 1 deletions
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11
drivers/scsi/scsi_error.c
View File

@ -184,10 +184,19 @@ int scsi_delete_timer(struct scsi_cmnd *scmd)
**/
void scsi_times_out(struct scsi_cmnd *scmd)
{
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
scsi_log_completion(scmd, TIMEOUT_ERROR);
if (scmd->device->host->transportt->eh_timed_out)
switch (scmd->device->host->transportt->eh_timed_out(scmd)) {
eh_timed_out = scmd->device->host->transportt->eh_timed_out;
else if (scmd->device->host->hostt->eh_timed_out)
eh_timed_out = scmd->device->host->hostt->eh_timed_out;
else
eh_timed_out = NULL;
if (eh_timed_out)
switch (eh_timed_out(scmd)) {
case EH_HANDLED:
__scsi_done(scmd);
return;

13
include/scsi/scsi_host.h
View File

@ -325,6 +325,19 @@ struct scsi_host_template {
*/
int (*proc_info)(struct Scsi_Host *, char *, char **, off_t, int, int);
/*
* This is an optional routine that allows the transport to become
* involved when a scsi io timer fires. The return value tells the
* timer routine how to finish the io timeout handling:
* EH_HANDLED: I fixed the error, please complete the command
* EH_RESET_TIMER: I need more time, reset the timer and
* begin counting again
* EH_NOT_HANDLED Begin normal error recovery
*
* Status: OPTIONAL
*/
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
/*
* suspend support
*/