Commit 2bb95584 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Martin K. Petersen
Browse files

scsi: core: add scsi_host_(block,unblock) helper function 

Add helper functions to call scsi_internal_device_block()/
scsi_internal_device_unblock() for all attached devices on a SCSI host.

Link: https://lore.kernel.org/r/20200228075318.91255-9-hare@suse.de


Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 5646e13a

drivers/scsi/scsi_lib.c

+30 −0
Original line number Diff line number Diff line
@@ -2845,6 +2845,36 @@ scsi_target_unblock(struct device *dev, enum scsi_device_state new_state) 
}

EXPORT_SYMBOL_GPL(scsi_target_unblock);



int

scsi_host_block(struct Scsi_Host *shost)

{

	struct scsi_device *sdev;

	int ret = 0;



	shost_for_each_device(sdev, shost) {

		ret = scsi_internal_device_block(sdev);

		if (ret)

			break;

	}

	return ret;

}

EXPORT_SYMBOL_GPL(scsi_host_block);



int

scsi_host_unblock(struct Scsi_Host *shost, int new_state)

{

	struct scsi_device *sdev;

	int ret = 0;



	shost_for_each_device(sdev, shost) {

		ret = scsi_internal_device_unblock(sdev, new_state);

		if (ret)

			break;

	}

	return ret;

}

EXPORT_SYMBOL_GPL(scsi_host_unblock);



/**

 * scsi_kmap_atomic_sg - find and atomically map an sg-elemnt

 * @sgl:	scatter-gather list

include/scsi/scsi_host.h

+2 −0
Original line number Diff line number Diff line
@@ -758,6 +758,8 @@ static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) 


extern void scsi_unblock_requests(struct Scsi_Host *);

extern void scsi_block_requests(struct Scsi_Host *);

extern int scsi_host_block(struct Scsi_Host *shost);

extern int scsi_host_unblock(struct Scsi_Host *shost, int new_state);



struct class_container;

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