mpt3sas: Refcount fw_events and fix unsafe list usage
The fw_event_work struct is concurrently referenced at shutdown. Add a
refcount to protect it and refactor the code to use it.
Additionally, refactor _scsih_fw_event_cleanup_queue() such that it no
longer iterates over the list without holding the lock since
_firmware_event_work() concurrently deletes items from the list.
This patch is ported from commit 008549f6e8
("mpt2sas: Refcount
fw_events and fix unsafe list usage"). These changes are also required
for mpt3sas.
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Родитель
d1cb5e495e
Коммит
146b16c807
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@ -200,9 +200,37 @@ struct fw_event_work {
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u8 VP_ID;
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u8 ignore;
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u16 event;
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struct kref refcount;
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char event_data[0] __aligned(4);
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};
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static void fw_event_work_free(struct kref *r)
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{
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kfree(container_of(r, struct fw_event_work, refcount));
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}
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static void fw_event_work_get(struct fw_event_work *fw_work)
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{
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kref_get(&fw_work->refcount);
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}
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static void fw_event_work_put(struct fw_event_work *fw_work)
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{
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kref_put(&fw_work->refcount, fw_event_work_free);
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}
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static struct fw_event_work *alloc_fw_event_work(int len)
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{
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struct fw_event_work *fw_event;
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fw_event = kzalloc(sizeof(*fw_event) + len, GFP_ATOMIC);
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if (!fw_event)
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return NULL;
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kref_init(&fw_event->refcount);
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return fw_event;
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}
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/**
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* struct _scsi_io_transfer - scsi io transfer
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* @handle: sas device handle (assigned by firmware)
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@ -2598,32 +2626,36 @@ _scsih_fw_event_add(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
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return;
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spin_lock_irqsave(&ioc->fw_event_lock, flags);
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fw_event_work_get(fw_event);
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INIT_LIST_HEAD(&fw_event->list);
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list_add_tail(&fw_event->list, &ioc->fw_event_list);
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INIT_WORK(&fw_event->work, _firmware_event_work);
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fw_event_work_get(fw_event);
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queue_work(ioc->firmware_event_thread, &fw_event->work);
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spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
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}
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/**
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* _scsih_fw_event_free - delete fw_event
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* _scsih_fw_event_del_from_list - delete fw_event from the list
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* @ioc: per adapter object
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* @fw_event: object describing the event
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* Context: This function will acquire ioc->fw_event_lock.
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*
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* This removes firmware event object from link list, frees associated memory.
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* If the fw_event is on the fw_event_list, remove it and do a put.
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*
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* Return nothing.
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*/
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static void
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_scsih_fw_event_free(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work
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_scsih_fw_event_del_from_list(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work
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*fw_event)
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{
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unsigned long flags;
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spin_lock_irqsave(&ioc->fw_event_lock, flags);
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list_del(&fw_event->list);
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kfree(fw_event);
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if (!list_empty(&fw_event->list)) {
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list_del_init(&fw_event->list);
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fw_event_work_put(fw_event);
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}
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spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
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}
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@ -2640,17 +2672,19 @@ mpt3sas_send_trigger_data_event(struct MPT3SAS_ADAPTER *ioc,
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struct SL_WH_TRIGGERS_EVENT_DATA_T *event_data)
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{
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struct fw_event_work *fw_event;
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u16 sz;
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if (ioc->is_driver_loading)
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return;
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fw_event = kzalloc(sizeof(*fw_event) + sizeof(*event_data),
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GFP_ATOMIC);
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sz = sizeof(*event_data);
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fw_event = alloc_fw_event_work(sz);
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if (!fw_event)
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return;
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fw_event->event = MPT3SAS_PROCESS_TRIGGER_DIAG;
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fw_event->ioc = ioc;
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memcpy(fw_event->event_data, event_data, sizeof(*event_data));
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_scsih_fw_event_add(ioc, fw_event);
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fw_event_work_put(fw_event);
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}
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/**
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@ -2666,12 +2700,13 @@ _scsih_error_recovery_delete_devices(struct MPT3SAS_ADAPTER *ioc)
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if (ioc->is_driver_loading)
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return;
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fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
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fw_event = alloc_fw_event_work(0);
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if (!fw_event)
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return;
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fw_event->event = MPT3SAS_REMOVE_UNRESPONDING_DEVICES;
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fw_event->ioc = ioc;
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_scsih_fw_event_add(ioc, fw_event);
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fw_event_work_put(fw_event);
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}
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/**
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@ -2685,12 +2720,29 @@ mpt3sas_port_enable_complete(struct MPT3SAS_ADAPTER *ioc)
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{
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struct fw_event_work *fw_event;
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fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
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fw_event = alloc_fw_event_work(0);
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if (!fw_event)
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return;
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fw_event->event = MPT3SAS_PORT_ENABLE_COMPLETE;
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fw_event->ioc = ioc;
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_scsih_fw_event_add(ioc, fw_event);
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fw_event_work_put(fw_event);
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}
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static struct fw_event_work *dequeue_next_fw_event(struct MPT3SAS_ADAPTER *ioc)
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{
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unsigned long flags;
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struct fw_event_work *fw_event = NULL;
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spin_lock_irqsave(&ioc->fw_event_lock, flags);
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if (!list_empty(&ioc->fw_event_list)) {
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fw_event = list_first_entry(&ioc->fw_event_list,
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struct fw_event_work, list);
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list_del_init(&fw_event->list);
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}
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spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
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return fw_event;
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}
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/**
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@ -2705,17 +2757,25 @@ mpt3sas_port_enable_complete(struct MPT3SAS_ADAPTER *ioc)
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static void
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_scsih_fw_event_cleanup_queue(struct MPT3SAS_ADAPTER *ioc)
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{
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struct fw_event_work *fw_event, *next;
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struct fw_event_work *fw_event;
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if (list_empty(&ioc->fw_event_list) ||
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!ioc->firmware_event_thread || in_interrupt())
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return;
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list_for_each_entry_safe(fw_event, next, &ioc->fw_event_list, list) {
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if (cancel_delayed_work_sync(&fw_event->delayed_work)) {
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_scsih_fw_event_free(ioc, fw_event);
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continue;
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}
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while ((fw_event = dequeue_next_fw_event(ioc))) {
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/*
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* Wait on the fw_event to complete. If this returns 1, then
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* the event was never executed, and we need a put for the
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* reference the delayed_work had on the fw_event.
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*
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* If it did execute, we wait for it to finish, and the put will
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* happen from _firmware_event_work()
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*/
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if (cancel_delayed_work_sync(&fw_event->delayed_work))
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fw_event_work_put(fw_event);
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fw_event_work_put(fw_event);
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}
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}
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@ -4242,13 +4302,14 @@ _scsih_send_event_to_turn_on_pfa_led(struct MPT3SAS_ADAPTER *ioc, u16 handle)
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{
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struct fw_event_work *fw_event;
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fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
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fw_event = alloc_fw_event_work(0);
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if (!fw_event)
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return;
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fw_event->event = MPT3SAS_TURN_ON_PFA_LED;
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fw_event->device_handle = handle;
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fw_event->ioc = ioc;
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_scsih_fw_event_add(ioc, fw_event);
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fw_event_work_put(fw_event);
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}
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/**
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@ -7498,10 +7559,11 @@ mpt3sas_scsih_reset_handler(struct MPT3SAS_ADAPTER *ioc, int reset_phase)
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static void
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_mpt3sas_fw_work(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
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{
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_scsih_fw_event_del_from_list(ioc, fw_event);
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/* the queue is being flushed so ignore this event */
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if (ioc->remove_host ||
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ioc->pci_error_recovery) {
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_scsih_fw_event_free(ioc, fw_event);
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if (ioc->remove_host || ioc->pci_error_recovery) {
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fw_event_work_put(fw_event);
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return;
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}
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@ -7512,8 +7574,16 @@ _mpt3sas_fw_work(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
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fw_event->event_data);
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break;
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case MPT3SAS_REMOVE_UNRESPONDING_DEVICES:
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while (scsi_host_in_recovery(ioc->shost) || ioc->shost_recovery)
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while (scsi_host_in_recovery(ioc->shost) ||
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ioc->shost_recovery) {
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/*
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* If we're unloading, bail. Otherwise, this can become
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* an infinite loop.
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*/
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if (ioc->remove_host)
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goto out;
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ssleep(1);
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}
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_scsih_remove_unresponding_sas_devices(ioc);
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_scsih_scan_for_devices_after_reset(ioc);
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break;
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@ -7558,7 +7628,8 @@ _mpt3sas_fw_work(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
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_scsih_sas_ir_operation_status_event(ioc, fw_event);
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break;
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}
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_scsih_fw_event_free(ioc, fw_event);
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out:
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fw_event_work_put(fw_event);
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}
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/**
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@ -7720,7 +7791,7 @@ mpt3sas_scsih_event_callback(struct MPT3SAS_ADAPTER *ioc, u8 msix_index,
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}
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sz = le16_to_cpu(mpi_reply->EventDataLength) * 4;
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fw_event = kzalloc(sizeof(*fw_event) + sz, GFP_ATOMIC);
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fw_event = alloc_fw_event_work(sz);
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if (!fw_event) {
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pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
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ioc->name, __FILE__, __LINE__, __func__);
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@ -7733,6 +7804,7 @@ mpt3sas_scsih_event_callback(struct MPT3SAS_ADAPTER *ioc, u8 msix_index,
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fw_event->VP_ID = mpi_reply->VP_ID;
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fw_event->event = event;
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_scsih_fw_event_add(ioc, fw_event);
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fw_event_work_put(fw_event);
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return 1;
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}
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