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[SCSI] scsi_transport_fc: Introduce helper function for blocking scsi_eh

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Move the duplicated code from FC LLDs to SCSI FC transport class.

Acked-by: James Smart <james.smart@emulex.com>
Acked-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Acked-by: Abhijeet Joglekar <abjoglek@cisco.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Christof Schmitt
2009-10-30 17:59:29 +01:00
committed by James Bottomley
parent 03b147083a
commit 65d430fa99
5 changed files with 37 additions and 65 deletions
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26
drivers/scsi/scsi_transport_fc.c
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@@ -27,6 +27,7 @@
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
@@ -3144,6 +3145,31 @@ fc_scsi_scan_rport(struct work_struct *work)
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
* @cmnd: SCSI command that scsi_eh is trying to recover
*
* This routine can be called from a FC LLD scsi_eh callback. It
* blocks the scsi_eh thread until the fc_rport leaves the
* FC_PORTSTATE_BLOCKED. This is necessary to avoid the scsi_eh
* failing recovery actions for blocked rports which would lead to
* offlined SCSI devices.
*/
void fc_block_scsi_eh(struct scsi_cmnd *cmnd)
{
struct Scsi_Host *shost = cmnd->device->host;
struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
while (rport->port_state == FC_PORTSTATE_BLOCKED) {
spin_unlock_irqrestore(shost->host_lock, flags);
msleep(1000);
spin_lock_irqsave(shost->host_lock, flags);
}
spin_unlock_irqrestore(shost->host_lock, flags);
}
EXPORT_SYMBOL(fc_block_scsi_eh);
/**
* fc_vport_setup - allocates and creates a FC virtual port.