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Subject[PATCH 14/16] staging: gasket: interrupt: refactor PCI MSIX-specific handler code
Date
From: Todd Poynor <toddpoynor@google.com>

Split interrupt handler into PCI MSIX-specific and generic functions,
for adding non-MSIX handlers in the future. Move MSIX init code
together,, out of generic init path.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
---
drivers/staging/gasket/gasket_interrupt.c | 48 ++++++++++++-----------
1 file changed, 25 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/gasket/gasket_interrupt.c b/drivers/staging/gasket/gasket_interrupt.c
index 1cfbc120f2284..f94e4ea9a7ded 100644
--- a/drivers/staging/gasket/gasket_interrupt.c
+++ b/drivers/staging/gasket/gasket_interrupt.c
@@ -157,9 +157,22 @@ static void gasket_interrupt_setup(struct gasket_dev *gasket_dev)
}
}

-static irqreturn_t gasket_msix_interrupt_handler(int irq, void *dev_id)
+static void
+gasket_handle_interrupt(struct gasket_interrupt_data *interrupt_data,
+ int interrupt_index)
{
struct eventfd_ctx *ctx;
+
+ trace_gasket_interrupt_event(interrupt_data->name, interrupt_index);
+ ctx = interrupt_data->eventfd_ctxs[interrupt_index];
+ if (ctx)
+ eventfd_signal(ctx, 1);
+
+ ++(interrupt_data->interrupt_counts[interrupt_index]);
+}
+
+static irqreturn_t gasket_msix_interrupt_handler(int irq, void *dev_id)
+{
struct gasket_interrupt_data *interrupt_data = dev_id;
int interrupt = -1;
int i;
@@ -175,14 +188,7 @@ static irqreturn_t gasket_msix_interrupt_handler(int irq, void *dev_id)
pr_err("Received unknown irq %d\n", irq);
return IRQ_HANDLED;
}
- trace_gasket_interrupt_event(interrupt_data->name, interrupt);
-
- ctx = interrupt_data->eventfd_ctxs[interrupt];
- if (ctx)
- eventfd_signal(ctx, 1);
-
- ++(interrupt_data->interrupt_counts[interrupt]);
-
+ gasket_handle_interrupt(interrupt_data, interrupt);
return IRQ_HANDLED;
}

@@ -192,6 +198,12 @@ gasket_interrupt_msix_init(struct gasket_interrupt_data *interrupt_data)
int ret = 1;
int i;

+ interrupt_data->msix_entries =
+ kcalloc(interrupt_data->num_interrupts,
+ sizeof(struct msix_entry), GFP_KERNEL);
+ if (!interrupt_data->msix_entries)
+ return -ENOMEM;
+
for (i = 0; i < interrupt_data->num_interrupts; i++) {
interrupt_data->msix_entries[i].entry = i;
interrupt_data->msix_entries[i].vector = 0;
@@ -343,20 +355,10 @@ int gasket_interrupt_init(struct gasket_dev *gasket_dev, const char *name,
interrupt_data->num_configured = 0;
interrupt_data->wire_interrupt_offsets = wire_int_offsets;

- /* Allocate all dynamic structures. */
- interrupt_data->msix_entries = kcalloc(num_interrupts,
- sizeof(struct msix_entry),
- GFP_KERNEL);
- if (!interrupt_data->msix_entries) {
- kfree(interrupt_data);
- return -ENOMEM;
- }
-
interrupt_data->eventfd_ctxs = kcalloc(num_interrupts,
sizeof(struct eventfd_ctx *),
GFP_KERNEL);
if (!interrupt_data->eventfd_ctxs) {
- kfree(interrupt_data->msix_entries);
kfree(interrupt_data);
return -ENOMEM;
}
@@ -366,7 +368,6 @@ int gasket_interrupt_init(struct gasket_dev *gasket_dev, const char *name,
GFP_KERNEL);
if (!interrupt_data->interrupt_counts) {
kfree(interrupt_data->eventfd_ctxs);
- kfree(interrupt_data->msix_entries);
kfree(interrupt_data);
return -ENOMEM;
}
@@ -417,6 +418,7 @@ gasket_interrupt_msix_cleanup(struct gasket_interrupt_data *interrupt_data)
if (interrupt_data->msix_configured)
pci_disable_msix(interrupt_data->pci_dev);
interrupt_data->msix_configured = 0;
+ kfree(interrupt_data->msix_entries);
}

int gasket_interrupt_reinit(struct gasket_dev *gasket_dev)
@@ -448,10 +450,11 @@ int gasket_interrupt_reinit(struct gasket_dev *gasket_dev)
}

if (ret) {
- /* Failing to setup MSIx will cause the device
+ /* Failing to setup interrupts will cause the device
* to report GASKET_STATUS_LAMED, but is not fatal.
*/
- dev_warn(gasket_dev->dev, "Couldn't init msix: %d\n", ret);
+ dev_warn(gasket_dev->dev, "Couldn't reinit interrupts: %d\n",
+ ret);
return 0;
}

@@ -497,7 +500,6 @@ void gasket_interrupt_cleanup(struct gasket_dev *gasket_dev)

kfree(interrupt_data->interrupt_counts);
kfree(interrupt_data->eventfd_ctxs);
- kfree(interrupt_data->msix_entries);
kfree(interrupt_data);
gasket_dev->interrupt_data = NULL;
}
--
2.18.0.597.ga71716f1ad-goog
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