scsi: Add scsi_vpd_tpg_id() (a8aa3978) · Commits · 戴 / test

drivers/scsi/scsi_lib.c

+48 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@
		#include <linux/scatterlist.h>
		#include <linux/blk-mq.h>
		#include <linux/ratelimit.h>
		#include <asm/unaligned.h>

		#include <scsi/scsi.h>
		#include <scsi/scsi_cmnd.h>
		@@ -3294,3 +3295,50 @@ next_desig:
		return id_size;
		}
		EXPORT_SYMBOL(scsi_vpd_lun_id);

		/*
		* scsi_vpd_tpg_id - return a target port group identifier
		* @sdev: SCSI device
		*
		* Returns the Target Port Group identifier from the information
		* froom VPD page 0x83 of the device.
		*
		* Returns the identifier or error on failure.
		*/
		int scsi_vpd_tpg_id(struct scsi_device sdev, int rel_id)
		{
		unsigned char *d;
		unsigned char __rcu *vpd_pg83;
		int group_id = -EAGAIN, rel_port = -1;

		rcu_read_lock();
		vpd_pg83 = rcu_dereference(sdev->vpd_pg83);
		if (!vpd_pg83) {
		rcu_read_unlock();
		return -ENXIO;
		}

		d = sdev->vpd_pg83 + 4;
		while (d < sdev->vpd_pg83 + sdev->vpd_pg83_len) {
		switch (d[1] & 0xf) {
		case 0x4:
		/* Relative target port */
		rel_port = get_unaligned_be16(&d[6]);
		break;
		case 0x5:
		/* Target port group */
		group_id = get_unaligned_be16(&d[6]);
		break;
		default:
		break;
		}
		d += d[3] + 4;
		}
		rcu_read_unlock();

		if (group_id >= 0 && rel_id && rel_port != -1)
		*rel_id = rel_port;

		return group_id;
		}
		EXPORT_SYMBOL(scsi_vpd_tpg_id);

+1 −0

Original line number	Diff line number	Diff line
		@@ -416,6 +416,7 @@ static inline int scsi_execute_req(struct scsi_device *sdev,
		extern void sdev_disable_disk_events(struct scsi_device *sdev);
		extern void sdev_enable_disk_events(struct scsi_device *sdev);
		extern int scsi_vpd_lun_id(struct scsi_device , char , size_t);
		extern int scsi_vpd_tpg_id(struct scsi_device , int );

		#ifdef CONFIG_PM
		extern int scsi_autopm_get_device(struct scsi_device *);