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Subject[PATCH v2 3/8] staging: ccree: Use platform_get_irq and devm_request_irq
Date
From: Suniel Mahesh <sunil.m@techveda.org>

It is recommended to use managed function devm_request_irq(),
which simplifies driver cleanup paths and driver code.
This patch does the following:
(a) replace platform_get_resource(), request_irq() and corresponding
error handling with platform_get_irq() and devm_request_irq().
(b) remove struct resource pointer(res_irq) in struct ssi_drvdata as
it seems redundant.
(c) change type of member irq in struct ssi_drvdata from unsigned int
to int, as return type of platform_get_irq is int and can be used in
error handling.
(d) remove irq_registered variable from driver probe as it seems
redundant.
(e) free_irq is not required any more, devm_request_irq() free's it
on driver detach.
(f) adjust log messages accordingly and remove any blank lines.

Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
drivers/staging/ccree/ssi_driver.c | 30 +++++++++---------------------
drivers/staging/ccree/ssi_driver.h | 3 +--
2 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c
index cbe9a03..3e7193d 100644
--- a/drivers/staging/ccree/ssi_driver.c
+++ b/drivers/staging/ccree/ssi_driver.c
@@ -222,7 +222,6 @@ static int init_cc_resources(struct platform_device *plat_dev)
{
struct resource *req_mem_cc_regs = NULL;
void __iomem *cc_base = NULL;
- bool irq_registered = false;
struct ssi_drvdata *new_drvdata;
struct device *dev = &plat_dev->dev;
struct device_node *np = dev->of_node;
@@ -262,26 +261,22 @@ static int init_cc_resources(struct platform_device *plat_dev)
&req_mem_cc_regs->start, new_drvdata->cc_base);
cc_base = new_drvdata->cc_base;
/* Then IRQ */
- new_drvdata->res_irq = platform_get_resource(plat_dev, IORESOURCE_IRQ, 0);
- if (unlikely(!new_drvdata->res_irq)) {
+ new_drvdata->irq = platform_get_irq(plat_dev, 0);
+ if (new_drvdata->irq < 0) {
SSI_LOG_ERR("Failed getting IRQ resource\n");
- rc = -ENODEV;
+ rc = new_drvdata->irq;
goto init_cc_res_err;
}
- rc = request_irq(new_drvdata->res_irq->start, cc_isr,
- IRQF_SHARED, "arm_cc7x", new_drvdata);
- if (unlikely(rc != 0)) {
- SSI_LOG_ERR("Could not register to interrupt %llu\n",
- (unsigned long long)new_drvdata->res_irq->start);
+ rc = devm_request_irq(&plat_dev->dev, new_drvdata->irq, cc_isr,
+ IRQF_SHARED, "arm_cc7x", new_drvdata);
+ if (rc) {
+ SSI_LOG_ERR("Could not register to interrupt %d\n",
+ new_drvdata->irq);
goto init_cc_res_err;
}
init_completion(&new_drvdata->icache_setup_completion);

- irq_registered = true;
- SSI_LOG_DEBUG("Registered to IRQ (%s) %llu\n",
- new_drvdata->res_irq->name,
- (unsigned long long)new_drvdata->res_irq->start);
-
+ SSI_LOG_DEBUG("Registered to IRQ: %d\n", new_drvdata->irq);
new_drvdata->plat_dev = plat_dev;

rc = cc_clk_on(new_drvdata);
@@ -410,10 +405,6 @@ static int init_cc_resources(struct platform_device *plat_dev)
#ifdef ENABLE_CC_SYSFS
ssi_sysfs_fini();
#endif
- if (irq_registered) {
- free_irq(new_drvdata->res_irq->start, new_drvdata);
- new_drvdata->res_irq = NULL;
- }
dev_set_drvdata(&plat_dev->dev, NULL);
}
return rc;
@@ -443,11 +434,8 @@ static void cleanup_cc_resources(struct platform_device *plat_dev)
#ifdef ENABLE_CC_SYSFS
ssi_sysfs_fini();
#endif
-
fini_cc_regs(drvdata);
cc_clk_off(drvdata);
- free_irq(drvdata->res_irq->start, drvdata);
- drvdata->res_irq = NULL;
dev_set_drvdata(&plat_dev->dev, NULL);
}

diff --git a/drivers/staging/ccree/ssi_driver.h b/drivers/staging/ccree/ssi_driver.h
index 518c0bf..88ef370 100644
--- a/drivers/staging/ccree/ssi_driver.h
+++ b/drivers/staging/ccree/ssi_driver.h
@@ -128,9 +128,8 @@ struct ssi_crypto_req {
* @fw_ver: SeP loaded firmware version
*/
struct ssi_drvdata {
- struct resource *res_irq;
void __iomem *cc_base;
- unsigned int irq;
+ int irq;
u32 irq_mask;
u32 fw_ver;
/* Calibration time of start/stop
--
2.1.4
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