staging: ccree: Use platform_get_irq and devm_request_irq

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c
index cbe9a03..3e7193d 100644 (file)
--- 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 @@ init_cc_res_err:
 #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 (file)
--- 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