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Subject[PATCH 2/8] staging: ccree: Convert to devm_ioremap_resource for map, unmap
Date
From: Suniel Mahesh <sunil.m@techveda.org>

It is recommended to use managed function devm_ioremap_resource(),
which simplifies driver cleanup paths and driver code.
This patch does the following:
(a) replace request_mem_region(), ioremap() and corresponding error
handling with devm_ioremap_resource().
(b) remove struct resource pointer(res_mem) in struct ssi_drvdata as it
seems redundant, use struct resource pointer which is defined locally and
adjust return value of platform_get_resource() accordingly.
(c) release_mem_region() and iounmap() are dropped, since devm_ioremap_
resource() releases and unmaps mem region on driver detach.
(d) adjust log messages accordingly and remove any blank lines.

Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
[gby: rebase on top of latest coding style fixes changes]
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
drivers/staging/ccree/ssi_driver.c | 60 ++++++++++----------------------------
drivers/staging/ccree/ssi_driver.h | 1 -
2 files changed, 15 insertions(+), 46 deletions(-)

diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c
index 47e0880..cbe9a03 100644
--- a/drivers/staging/ccree/ssi_driver.c
+++ b/drivers/staging/ccree/ssi_driver.c
@@ -246,35 +246,21 @@ static int init_cc_resources(struct platform_device *plat_dev)
dev_set_drvdata(&plat_dev->dev, new_drvdata);
/* Get device resources */
/* First CC registers space */
- new_drvdata->res_mem = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
- if (unlikely(!new_drvdata->res_mem)) {
- SSI_LOG_ERR("Failed getting IO memory resource\n");
- rc = -ENODEV;
- goto init_cc_res_err;
- }
- SSI_LOG_DEBUG("Got MEM resource (%s): start=%pad end=%pad\n",
- new_drvdata->res_mem->name,
- new_drvdata->res_mem->start,
- new_drvdata->res_mem->end);
+ req_mem_cc_regs = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
/* Map registers space */
- req_mem_cc_regs = request_mem_region(new_drvdata->res_mem->start, resource_size(new_drvdata->res_mem), "arm_cc7x_regs");
- if (unlikely(!req_mem_cc_regs)) {
- SSI_LOG_ERR("Couldn't allocate registers memory region at "
- "0x%08X\n", (unsigned int)new_drvdata->res_mem->start);
- rc = -EBUSY;
- goto init_cc_res_err;
- }
- cc_base = ioremap(new_drvdata->res_mem->start, resource_size(new_drvdata->res_mem));
- if (unlikely(!cc_base)) {
- SSI_LOG_ERR("ioremap[CC](0x%08X,0x%08X) failed\n",
- (unsigned int)new_drvdata->res_mem->start,
- (unsigned int)resource_size(new_drvdata->res_mem));
- rc = -ENOMEM;
+ new_drvdata->cc_base = devm_ioremap_resource(&plat_dev->dev,
+ req_mem_cc_regs);
+ if (IS_ERR(new_drvdata->cc_base)) {
+ rc = PTR_ERR(new_drvdata->cc_base);
goto init_cc_res_err;
}
- SSI_LOG_DEBUG("CC registers mapped from %pa to 0x%p\n", &new_drvdata->res_mem->start, cc_base);
- new_drvdata->cc_base = cc_base;
-
+ SSI_LOG_DEBUG("Got MEM resource (%s): start=%pad end=%pad\n",
+ req_mem_cc_regs->name,
+ req_mem_cc_regs->start,
+ req_mem_cc_regs->end);
+ SSI_LOG_DEBUG("CC registers mapped from %pa to 0x%p\n",
+ &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)) {
@@ -424,17 +410,9 @@ static int init_cc_resources(struct platform_device *plat_dev)
#ifdef ENABLE_CC_SYSFS
ssi_sysfs_fini();
#endif
-
- if (req_mem_cc_regs) {
- if (irq_registered) {
- free_irq(new_drvdata->res_irq->start, new_drvdata);
- new_drvdata->res_irq = NULL;
- iounmap(cc_base);
- new_drvdata->cc_base = NULL;
- }
- release_mem_region(new_drvdata->res_mem->start,
- resource_size(new_drvdata->res_mem));
- new_drvdata->res_mem = NULL;
+ if (irq_registered) {
+ free_irq(new_drvdata->res_irq->start, new_drvdata);
+ new_drvdata->res_irq = NULL;
}
dev_set_drvdata(&plat_dev->dev, NULL);
}
@@ -470,14 +448,6 @@ static void cleanup_cc_resources(struct platform_device *plat_dev)
cc_clk_off(drvdata);
free_irq(drvdata->res_irq->start, drvdata);
drvdata->res_irq = NULL;
-
- if (drvdata->cc_base) {
- iounmap(drvdata->cc_base);
- release_mem_region(drvdata->res_mem->start,
- resource_size(drvdata->res_mem));
- drvdata->cc_base = NULL;
- drvdata->res_mem = 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 b6ad89a..518c0bf 100644
--- a/drivers/staging/ccree/ssi_driver.h
+++ b/drivers/staging/ccree/ssi_driver.h
@@ -128,7 +128,6 @@ struct ssi_crypto_req {
* @fw_ver: SeP loaded firmware version
*/
struct ssi_drvdata {
- struct resource *res_mem;
struct resource *res_irq;
void __iomem *cc_base;
unsigned int irq;
--
2.1.4
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