[PATCH] pcmcia: warn if driver requests exclusive, but gets a shared IRQ

The patch below cleans up the pcmcia code a bit on the IRQ side (I did
this while debugging the problem just so I could read wtf it was doing),
and also adds a warning and passes back the correct information when a
device asks for exclusive but gets given shared. This at least means the
dmesg dump of a problem triggered by this will have a signature to find.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 18 insertions, 9 deletions

diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 3131bb0a0095..3281e519e714 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -788,6 +788,7 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
         struct pcmcia_socket *s = p_dev->socket;
         config_t *c;
         int ret = CS_IN_USE, irq = 0;
+        int type;
 
         if (!(s->state & SOCKET_PRESENT))
                 return CS_NO_CARD;
@@ -797,6 +798,13 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
         if (c->state & CONFIG_IRQ_REQ)
                 return CS_IN_USE;
 
+        /* Decide what type of interrupt we are registering */
+        type = 0;
+        if (s->functions > 1)           /* All of this ought to be handled higher up */
+                type = SA_SHIRQ;
+        if (req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)
+                type = SA_SHIRQ;
+
 #ifdef CONFIG_PCMCIA_PROBE
         if (s->irq.AssignedIRQ != 0) {
                 /* If the interrupt is already assigned, it must be the same */
@@ -822,9 +830,7 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
                          * marked as used by the kernel resource management core */
                         ret = request_irq(irq,
                                           (req->Attributes & IRQ_HANDLE_PRESENT) ? req->Handler : test_action,
-                                          ((req->Attributes & IRQ_TYPE_DYNAMIC_SHARING) ||
-                                           (s->functions > 1) ||
-                                           (irq == s->pci_irq)) ? SA_SHIRQ : 0,
+                                          type,
                                           p_dev->devname,
                                           (req->Attributes & IRQ_HANDLE_PRESENT) ? req->Instance : data);
                         if (!ret) {
@@ -839,18 +845,21 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
         if (ret && !s->irq.AssignedIRQ) {
                 if (!s->pci_irq)
                         return ret;
+                type = SA_SHIRQ;
                 irq = s->pci_irq;
         }
 
-        if (ret && req->Attributes & IRQ_HANDLE_PRESENT) {
-                if (request_irq(irq, req->Handler,
-                                ((req->Attributes & IRQ_TYPE_DYNAMIC_SHARING) ||
-                                 (s->functions > 1) ||
-                                 (irq == s->pci_irq)) ? SA_SHIRQ : 0,
-                                p_dev->devname, req->Instance))
+        if (ret && (req->Attributes & IRQ_HANDLE_PRESENT)) {
+                if (request_irq(irq, req->Handler, type,  p_dev->devname, req->Instance))
                         return CS_IN_USE;
         }
 
+        /* Make sure the fact the request type was overridden is passed back */
+        if (type == SA_SHIRQ && !(req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)) {
+                req->Attributes |= IRQ_TYPE_DYNAMIC_SHARING;
+                printk(KERN_WARNING "pcmcia: request for exclusive IRQ could not be fulfilled.\n");
+                printk(KERN_WARNING "pcmcia: the driver needs updating to supported shared IRQ lines.\n");
+        }
         c->irq.Attributes = req->Attributes;
         s->irq.AssignedIRQ = req->AssignedIRQ = irq;
         s->irq.Config++;