From: Hannes Reinecke Date: Fri, 6 May 2016 08:34:35 +0000 (+0200) Subject: scsi_dh_alua: do not fail for unknown VPD identification X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fe8b9534a0a0356f8a76467e2c561194bdb53c84;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git scsi_dh_alua: do not fail for unknown VPD identification Not every device will return a useable VPD identification, but still might support ALUA. Rather than disable ALUA support we should be allowing the device identification to be empty and attach individual ALUA device handler to each devices. [mkp: Fixed typo reported by Bart] Reported-by: Paul Mackerras Signed-off-by: Hannes Reinecke Tested-by: Paul Mackerras Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c index e034f12c1418..b2244eb90776 100644 --- a/drivers/scsi/device_handler/scsi_dh_alua.c +++ b/drivers/scsi/device_handler/scsi_dh_alua.c @@ -195,10 +195,13 @@ static struct alua_port_group *alua_find_get_pg(char *id_str, size_t id_size, { struct alua_port_group *pg; + if (!id_str || !id_size || !strlen(id_str)) + return NULL; + list_for_each_entry(pg, &port_group_list, node) { if (pg->group_id != group_id) continue; - if (pg->device_id_len != id_size) + if (!pg->device_id_len || pg->device_id_len != id_size) continue; if (strncmp(pg->device_id_str, id_str, id_size)) continue; @@ -232,14 +235,14 @@ static struct alua_port_group *alua_alloc_pg(struct scsi_device *sdev, sizeof(pg->device_id_str)); if (pg->device_id_len <= 0) { /* - * Internal error: TPGS supported but no device - * identifcation found. Disable ALUA support. + * TPGS supported but no device identification found. + * Generate private device identification. */ - kfree(pg); sdev_printk(KERN_INFO, sdev, "%s: No device descriptors found\n", ALUA_DH_NAME); - return ERR_PTR(-ENXIO); + pg->device_id_str[0] = '\0'; + pg->device_id_len = 0; } pg->group_id = group_id; pg->tpgs = tpgs; @@ -354,9 +357,15 @@ static int alua_check_vpd(struct scsi_device *sdev, struct alua_dh_data *h, return SCSI_DH_NOMEM; return SCSI_DH_DEV_UNSUPP; } - sdev_printk(KERN_INFO, sdev, - "%s: device %s port group %x rel port %x\n", - ALUA_DH_NAME, pg->device_id_str, group_id, rel_port); + if (pg->device_id_len) + sdev_printk(KERN_INFO, sdev, + "%s: device %s port group %x rel port %x\n", + ALUA_DH_NAME, pg->device_id_str, + group_id, rel_port); + else + sdev_printk(KERN_INFO, sdev, + "%s: port group %x rel port %x\n", + ALUA_DH_NAME, group_id, rel_port); /* Check for existing port group references */ spin_lock(&h->pg_lock);