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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: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
This commit is contained in:
Ben Collins 2006-06-12 18:16:01 -04:00
parent f654240f33
commit 445151932e
1 changed files with 17 additions and 10 deletions
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27
drivers/ieee1394/highlevel.c
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@ -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,