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>
diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 8dce223..f355c5a 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -408,41 +408,6 @@
} /* 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 @@
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;
+
+/**
+ * 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;
+
+ if (!p_dev->irq)
+ return -EINVAL;
+
+ 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;
- 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;
- }
- }
-
- req->AssignedIRQ = irq;
-
- 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 @@
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 @@
{
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 @@
/* 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 @@
{
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);
}