pcmcia: re-work pcmcia_request_irq()

Instead of the old pcmcia_request_irq() interface, drivers may now
choose between:

- calling request_irq/free_irq directly. Use the IRQ from *p_dev->irq.

- use pcmcia_request_irq(p_dev, handler_t); the PCMCIA core will
  clean up automatically on calls to pcmcia_disable_device() or
  device ejection.

- drivers still not capable of IRQF_SHARED (or not telling us so) may
  use the deprecated pcmcia_request_exclusive_irq() for the time
  being; they might receive a shared IRQ nonetheless.

CC: linux-bluetooth@vger.kernel.org
CC: netdev@vger.kernel.org
CC: linux-wireless@vger.kernel.org
CC: linux-serial@vger.kernel.org
CC: alsa-devel@alsa-project.org
CC: linux-usb@vger.kernel.org
CC: linux-ide@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 54 insertions, 83 deletions

diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 8dce223f3f44..f355c5ac407b 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -408,41 +408,6 @@ out:
 } /* pcmcia_release_io */
 
 
-static int pcmcia_release_irq(struct pcmcia_device *p_dev, irq_req_t *req)
-{
-        struct pcmcia_socket *s = p_dev->socket;
-        config_t *c;
-        int ret = -EINVAL;
-
-        mutex_lock(&s->ops_mutex);
-
-        c = p_dev->function_config;
-
-        if (!p_dev->_irq)
-                goto out;
-
-        p_dev->_irq = 0;
-
-        if (c->state & CONFIG_LOCKED)
-                goto out;
-
-        if (s->pcmcia_irq != req->AssignedIRQ) {
-                dev_dbg(&s->dev, "IRQ must match assigned one\n");
-                goto out;
-        }
-
-        if (req->Handler)
-                free_irq(req->AssignedIRQ, p_dev->priv);
-
-        ret = 0;
-
-out:
-        mutex_unlock(&s->ops_mutex);
-
-        return ret;
-} /* pcmcia_release_irq */
-
-
 int pcmcia_release_window(struct pcmcia_device *p_dev, window_handle_t wh)
 {
         struct pcmcia_socket *s = p_dev->socket;
@@ -681,61 +646,66 @@ out:
 EXPORT_SYMBOL(pcmcia_request_io);
 
 
-/** pcmcia_request_irq
+/**
+ * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
  *
- * Request_irq() reserves an irq for this client.
+ * pcmcia_request_irq() is a wrapper around request_irq which will allow
+ * the PCMCIA core to clean up the registration in pcmcia_disable_device().
+ * Drivers are free to use request_irq() directly, but then they need to
+ * call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
+ * handlers are allowed.
  */
-
-int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
+int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
+                                    irq_handler_t handler)
 {
-        struct pcmcia_socket *s = p_dev->socket;
-        config_t *c;
-        int ret = -EINVAL, irq = p_dev->irq_v;
-        int type = IRQF_SHARED;
+        int ret;
 
-        mutex_lock(&s->ops_mutex);
+        if (!p_dev->irq)
+                return -EINVAL;
 
-        if (!(s->state & SOCKET_PRESENT)) {
-                dev_dbg(&s->dev, "No card present\n");
-                goto out;
-        }
-        c = p_dev->function_config;
-        if (c->state & CONFIG_LOCKED) {
-                dev_dbg(&s->dev, "Configuration is locked\n");
-                goto out;
-        }
+        ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
+                        p_dev->devname, p_dev->priv);
+        if (!ret)
+                p_dev->_irq = 1;
 
-        if (!irq) {
-                dev_dbg(&s->dev, "no IRQ available\n");
-                goto out;
-        }
+        return ret;
+}
+EXPORT_SYMBOL(pcmcia_request_irq);
 
-        if (!(req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)) {
-                req->Attributes |= IRQ_TYPE_DYNAMIC_SHARING;
-                dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
-                        "needs updating to supported shared IRQ lines.\n");
-        }
 
-        if (req->Handler) {
-                ret = request_irq(irq, req->Handler, type,
-                                  p_dev->devname, p_dev->priv);
-                if (ret) {
-                        dev_printk(KERN_INFO, &s->dev,
-                                "request_irq() failed\n");
-                        goto out;
-                }
-        }
+/**
+ * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
+ *
+ * pcmcia_request_exclusive_irq() is a wrapper around request_irq which
+ * attempts first to request an exclusive IRQ. If it fails, it also accepts
+ * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
+ * IRQ sharing and either use request_irq directly (then they need to call
+ * free_irq themselves, too), or the pcmcia_request_irq() function.
+ */
+int __must_check
+pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev, irq_handler_t handler)
+{
+        int ret;
 
-        req->AssignedIRQ = irq;
+        if (!p_dev->irq)
+                return -EINVAL;
 
-        p_dev->_irq = 1;
+        ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv);
+        if (ret) {
+                ret = pcmcia_request_irq(p_dev, handler);
+                dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
+                        "request for exclusive IRQ could not be fulfilled.\n");
+                dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
+                        "needs updating to supported shared IRQ lines.\n");
+        }
+        if (ret)
+                dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n");
+        else
+                p_dev->_irq = 1;
 
-        ret = 0;
-out:
-        mutex_unlock(&s->ops_mutex);
         return ret;
-} /* pcmcia_request_irq */
-EXPORT_SYMBOL(pcmcia_request_irq);
+} /* pcmcia_request_exclusive_irq */
+EXPORT_SYMBOL(pcmcia_request_exclusive_irq);
 
 
 #ifdef CONFIG_PCMCIA_PROBE
@@ -779,7 +749,7 @@ static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
                                   p_dev);
                 if (!ret) {
                         free_irq(irq, p_dev);
-                        p_dev->irq_v = s->pcmcia_irq = irq;
+                        p_dev->irq = s->pcmcia_irq = irq;
                         pcmcia_used_irq[irq]++;
                         break;
                 }
@@ -820,12 +790,12 @@ int pcmcia_setup_irq(struct pcmcia_device *p_dev)
 {
         struct pcmcia_socket *s = p_dev->socket;
 
-        if (p_dev->irq_v)
+        if (p_dev->irq)
                 return 0;
 
         /* already assigned? */
         if (s->pcmcia_irq) {
-                p_dev->irq_v = s->pcmcia_irq;
+                p_dev->irq = s->pcmcia_irq;
                 return 0;
         }
 
@@ -839,7 +809,7 @@ int pcmcia_setup_irq(struct pcmcia_device *p_dev)
 
         /* but use the PCI irq otherwise */
         if (s->pci_irq) {
-                p_dev->irq_v = s->pcmcia_irq = s->pci_irq;
+                p_dev->irq = s->pcmcia_irq = s->pci_irq;
                 return 0;
         }
 
@@ -947,7 +917,8 @@ void pcmcia_disable_device(struct pcmcia_device *p_dev)
 {
         pcmcia_release_configuration(p_dev);
         pcmcia_release_io(p_dev, &p_dev->io);
-        pcmcia_release_irq(p_dev, &p_dev->irq);
+        if (p_dev->_irq)
+                free_irq(p_dev->irq, p_dev->priv);
         if (p_dev->win)
                 pcmcia_release_window(p_dev, p_dev->win);
 }