diff options
| -rw-r--r-- | drivers/scsi/mpt2sas/mpt2sas_base.h | 2 | ||||
| -rw-r--r-- | drivers/scsi/mpt2sas/mpt2sas_transport.c | 84 |
2 files changed, 86 insertions, 0 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h index 2616bb1597b0..454a74a3ec50 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_base.h +++ b/drivers/scsi/mpt2sas/mpt2sas_base.h @@ -366,6 +366,7 @@ struct _sas_port { * @phy_id: unique phy id * @handle: device handle for this phy * @attached_handle: device handle for attached device + * @phy_belongs_to_port: port has been created for this phy */ struct _sas_phy { struct list_head port_siblings; @@ -375,6 +376,7 @@ struct _sas_phy { u8 phy_id; u16 handle; u16 attached_handle; + u8 phy_belongs_to_port; }; /** diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c index bb2d2c93718b..2727c3b65104 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_transport.c +++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c @@ -465,6 +465,85 @@ _transport_expander_report_manufacture(struct MPT2SAS_ADAPTER *ioc, return rc; } + +/** + * _transport_delete_duplicate_port - (see below description) + * @ioc: per adapter object + * @sas_node: sas node object (either expander or sas host) + * @sas_address: sas address of device being added + * @phy_num: phy number + * + * This function is called when attempting to add a new port that is claiming + * the same phy resources already in use by another port. If we don't release + * the claimed phy resources, the sas transport layer will hang from the BUG + * in sas_port_add_phy. + * + * The reason we would hit this issue is becuase someone is changing the + * sas address of a device on the fly, meanwhile controller firmware sends + * EVENTs out of order when removing the previous instance of the device. + */ +static void +_transport_delete_duplicate_port(struct MPT2SAS_ADAPTER *ioc, + struct _sas_node *sas_node, u64 sas_address, int phy_num) +{ + struct _sas_port *mpt2sas_port, *mpt2sas_port_duplicate; + struct _sas_phy *mpt2sas_phy; + + printk(MPT2SAS_ERR_FMT "new device located at sas_addr(0x%016llx), " + "phy_id(%d)\n", ioc->name, (unsigned long long)sas_address, + phy_num); + + mpt2sas_port_duplicate = NULL; + list_for_each_entry(mpt2sas_port, &sas_node->sas_port_list, port_list) { + dev_printk(KERN_ERR, &mpt2sas_port->port->dev, + "existing device at sas_addr(0x%016llx), num_phys(%d)\n", + (unsigned long long) + mpt2sas_port->remote_identify.sas_address, + mpt2sas_port->num_phys); + list_for_each_entry(mpt2sas_phy, &mpt2sas_port->phy_list, + port_siblings) { + dev_printk(KERN_ERR, &mpt2sas_phy->phy->dev, + "phy_number(%d)\n", mpt2sas_phy->phy_id); + if (mpt2sas_phy->phy_id == phy_num) + mpt2sas_port_duplicate = mpt2sas_port; + } + } + + if (!mpt2sas_port_duplicate) + return; + + dev_printk(KERN_ERR, &mpt2sas_port_duplicate->port->dev, + "deleting duplicate device at sas_addr(0x%016llx), phy(%d)!!!!\n", + (unsigned long long) + mpt2sas_port_duplicate->remote_identify.sas_address, phy_num); + ioc->logging_level |= MPT_DEBUG_TRANSPORT; + mpt2sas_transport_port_remove(ioc, + mpt2sas_port_duplicate->remote_identify.sas_address, + sas_node->sas_address); + ioc->logging_level &= ~MPT_DEBUG_TRANSPORT; +} + +/** + * _transport_sanity_check - sanity check when adding a new port + * @ioc: per adapter object + * @sas_node: sas node object (either expander or sas host) + * @sas_address: sas address of device being added + * + * See the explanation above from _transport_delete_duplicate_port + */ +static void +_transport_sanity_check(struct MPT2SAS_ADAPTER *ioc, struct _sas_node *sas_node, + u64 sas_address) +{ + int i; + + for (i = 0; i < sas_node->num_phys; i++) + if (sas_node->phy[i].remote_identify.sas_address == sas_address) + if (sas_node->phy[i].phy_belongs_to_port) + _transport_delete_duplicate_port(ioc, sas_node, + sas_address, i); +} + /** * mpt2sas_transport_port_add - insert port to the list * @ioc: per adapter object @@ -522,6 +601,9 @@ mpt2sas_transport_port_add(struct MPT2SAS_ADAPTER *ioc, u16 handle, goto out_fail; } + _transport_sanity_check(ioc, sas_node, + mpt2sas_port->remote_identify.sas_address); + for (i = 0; i < sas_node->num_phys; i++) { if (sas_node->phy[i].remote_identify.sas_address != mpt2sas_port->remote_identify.sas_address) @@ -553,6 +635,7 @@ mpt2sas_transport_port_add(struct MPT2SAS_ADAPTER *ioc, u16 handle, mpt2sas_port->remote_identify.sas_address, mpt2sas_phy->phy_id); sas_port_add_phy(port, mpt2sas_phy->phy); + mpt2sas_phy->phy_belongs_to_port = 1; } mpt2sas_port->port = port; @@ -651,6 +734,7 @@ mpt2sas_transport_port_remove(struct MPT2SAS_ADAPTER *ioc, u64 sas_address, (unsigned long long) mpt2sas_port->remote_identify.sas_address, mpt2sas_phy->phy_id); + mpt2sas_phy->phy_belongs_to_port = 0; sas_port_delete_phy(mpt2sas_port->port, mpt2sas_phy->phy); list_del(&mpt2sas_phy->port_siblings); } |