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Commit 44515193 authored by Ben Collins's avatar Ben Collins
Browse files

ieee1394: hl_irqs_lock is taken in hardware interrupt context 



ohci1394 and pcilynx call highlevel_host_reset from their hardware
interrupt handler (via hpsb_selfid_complete).  Therefore all readers and
writers of hl_irqs_lock have to disable interrupts.  Reported by Jiri
Slaby and J. A. Magallon.

Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: default avatarBen Collins <bcollins@ubuntu.com>
parent f654240f

drivers/ieee1394/highlevel.c

+17 −10
Original line number Diff line number Diff line
@@ -210,6 +210,8 @@ static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data) 


void hpsb_register_highlevel(struct hpsb_highlevel *hl)

{

	unsigned long flags;



        INIT_LIST_HEAD(&hl->addr_list);

	INIT_LIST_HEAD(&hl->host_info_list);
@@ -219,9 +221,9 @@ void hpsb_register_highlevel(struct hpsb_highlevel *hl) 
        list_add_tail(&hl->hl_list, &hl_drivers);

	up_write(&hl_drivers_sem);



	write_lock(&hl_irqs_lock);

	write_lock_irqsave(&hl_irqs_lock, flags);

	list_add_tail(&hl->irq_list, &hl_irqs);

	write_unlock(&hl_irqs_lock);

	write_unlock_irqrestore(&hl_irqs_lock, flags);



	if (hl->add_host)

		nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
@@ -282,9 +284,11 @@ static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data) 


void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)

{

	write_lock(&hl_irqs_lock);

	unsigned long flags;



	write_lock_irqsave(&hl_irqs_lock, flags);

	list_del(&hl->irq_list);

	write_unlock(&hl_irqs_lock);

	write_unlock_irqrestore(&hl_irqs_lock, flags);



	down_write(&hl_drivers_sem);

        list_del(&hl->hl_list);
@@ -517,42 +521,45 @@ void highlevel_remove_host(struct hpsb_host *host) 


void highlevel_host_reset(struct hpsb_host *host)

{

	unsigned long flags;

        struct hpsb_highlevel *hl;



	read_lock(&hl_irqs_lock);

	read_lock_irqsave(&hl_irqs_lock, flags);

	list_for_each_entry(hl, &hl_irqs, irq_list) {

                if (hl->host_reset)

                        hl->host_reset(host);

        }

	read_unlock(&hl_irqs_lock);

	read_unlock_irqrestore(&hl_irqs_lock, flags);

}



void highlevel_iso_receive(struct hpsb_host *host, void *data, size_t length)

{

	unsigned long flags;

        struct hpsb_highlevel *hl;

        int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;



        read_lock(&hl_irqs_lock);

        read_lock_irqsave(&hl_irqs_lock, flags);

	list_for_each_entry(hl, &hl_irqs, irq_list) {

                if (hl->iso_receive)

                        hl->iso_receive(host, channel, data, length);

        }

        read_unlock(&hl_irqs_lock);

        read_unlock_irqrestore(&hl_irqs_lock, flags);

}



void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,

			   void *data, size_t length)

{

	unsigned long flags;

        struct hpsb_highlevel *hl;

        int cts = ((quadlet_t *)data)[0] >> 4;



        read_lock(&hl_irqs_lock);

        read_lock_irqsave(&hl_irqs_lock, flags);

	list_for_each_entry(hl, &hl_irqs, irq_list) {

                if (hl->fcp_request)

                        hl->fcp_request(host, nodeid, direction, cts, data,

					length);

        }

        read_unlock(&hl_irqs_lock);

        read_unlock_irqrestore(&hl_irqs_lock, flags);

}



int highlevel_read(struct hpsb_host *host, int nodeid, void *data,