diff options
authorDominik Brodowski <linux@dominikbrodowski.net>2005-07-28 01:07:27 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-28 08:39:01 -0700
commita1b274fbe3f00469fb8a68806469ec7746c7f648 (patch)
parent661d04c6f08c16ae63fb3be05d59ee99c6f3de52 (diff)
[PATCH] pcmcia: fix sharing IRQs and request_irq without IRQ_HANDLE_PRESENT
Debugging and description from: Noah Misch <noah@cs.caltech.edu> When a driver calls pcmcia_request_irq with IRQ_HANDLE_PRESENT unset, it looks for an open IRQ by request_irq()ing with a dummy handler and NULL dev_info. free_irq uses dev_info as a key for identifying the handler to free among those sharing an IRQ, so request_irq returns -EINVAL if dev_info is NULL and the IRQ may be shared. That unknown error code is the -EINVAL. It looks like only pcnet_cs and axnet_cs are affected. Most other drivers let pcmcia_request_irq install their interrupt handlers. sym53c500_cs requests its IRQ manually, but it cannot share an IRQ. The appended patch changes pcmcia_request_irq to pass an arbitrary, unique, non-NULL dev_info with the dummy handler. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 184f4f88b2a0..6f9fdb276402 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -800,7 +800,7 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
} else {
int try;
u32 mask = s->irq_mask;
- void *data = NULL;
+ void *data = &p_dev->dev.driver; /* something unique to this device */
for (try = 0; try < 64; try++) {
irq = try % 32;