[PATCH 08/24] ste_dma40: Less checks in d40_hw_detect_init() after error detection

SF Markus Elfring
2016-09-17T15:16:11Z

Date: Sat, 17 Sep 2016 14:10:47 +0200

Four checks could be repeated by the d40_hw_detect_init() function during
error handling even if the passed variables contained a null pointer.

* Adjust jump targets according to the Linux coding style convention.

* Call the interface "iounmap" only once at the end.

* Delete the repeated checks which became unnecessary with
this refactoring.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
drivers/dma/ste_dma40.c | 67 ++++++++++++++++++++++++-------------------------
1 file changed, 33 insertions(+), 34 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index f813056..c680dd3 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3158,27 +3158,27 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
d40_err(&pdev->dev, "No matching clock found\n");
- goto failure;
+ goto check_prepare_enabled;
}

clk_ret = clk_prepare_enable(clk);
if (clk_ret) {
d40_err(&pdev->dev, "Failed to prepare/enable clock\n");
- goto failure;
+ goto disable_unprepare;
}

/* Get IO for DMAC base address */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
if (!res)
- goto failure;
+ goto disable_unprepare;

if (request_mem_region(res->start, resource_size(res),
D40_NAME " I/O base") = NULL)
- goto failure;
+ goto release_region;

virtbase = ioremap(res->start, resource_size(res));
if (!virtbase)
- goto failure;
+ goto release_region;

/* This is just a regular AMBA PrimeCell ID actually */
for (pid = 0, i = 0; i < 4; i++)
@@ -3190,13 +3190,13 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)

if (cid != AMBA_CID) {
d40_err(&pdev->dev, "Unknown hardware! No PrimeCell ID\n");
- goto failure;
+ goto unmap_io;
}
if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) {
d40_err(&pdev->dev, "Unknown designer! Got %x wanted %x\n",
AMBA_MANF_BITS(pid),
AMBA_VENDOR_ST);
- goto failure;
+ goto unmap_io;
}
/*
* HW revision:
@@ -3210,7 +3210,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
rev = AMBA_REV_BITS(pid);
if (rev < 2) {
d40_err(&pdev->dev, "hardware revision: %d is not supported", rev);
- goto failure;
+ goto unmap_io;
}

/* The number of physical channels on this HW */
@@ -3236,7 +3236,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
sizeof(struct d40_chan), GFP_KERNEL);

if (base = NULL)
- goto failure;
+ goto unmap_io;

base->rev = rev;
base->clk = clk;
@@ -3285,63 +3285,62 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
sizeof(*base->phy_res),
GFP_KERNEL);
if (!base->phy_res)
- goto failure;
+ goto free_base;

base->lookup_phy_chans = kcalloc(num_phy_chans,
sizeof(*base->lookup_phy_chans),
GFP_KERNEL);
if (!base->lookup_phy_chans)
- goto failure;
+ goto free_phy_res;

base->lookup_log_chans = kcalloc(num_log_chans,
sizeof(*base->lookup_log_chans),
GFP_KERNEL);
if (!base->lookup_log_chans)
- goto failure;
+ goto free_phy_chans;

base->reg_val_backup_chan = kmalloc_array(base->num_phy_chans,
sizeof(d40_backup_regs_chan),
GFP_KERNEL);
if (!base->reg_val_backup_chan)
- goto failure;
+ goto free_log_chans;

base->lcla_pool.alloc_map = kcalloc(num_phy_chans
* D40_LCLA_LINK_PER_EVENT_GRP,
sizeof(*base->lcla_pool.alloc_map),
GFP_KERNEL);
if (!base->lcla_pool.alloc_map)
- goto failure;
+ goto free_backup_chan;

base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
0, SLAB_HWCACHE_ALIGN,
NULL);
if (base->desc_slab = NULL)
- goto failure;
+ goto free_map;

return base;
-
-failure:
+ free_map:
+ kfree(base->lcla_pool.alloc_map);
+ free_backup_chan:
+ kfree(base->reg_val_backup_chan);
+ free_log_chans:
+ kfree(base->lookup_log_chans);
+ free_phy_chans:
+ kfree(base->lookup_phy_chans);
+ free_phy_res:
+ kfree(base->phy_res);
+ free_base:
+ kfree(base);
+ unmap_io:
+ iounmap(virtbase);
+ release_region:
+ release_mem_region(res->start, resource_size(res));
+ check_prepare_enabled:
if (!clk_ret)
+ disable_unprepare:
clk_disable_unprepare(clk);
if (!IS_ERR(clk))
clk_put(clk);
- if (virtbase)
- iounmap(virtbase);
- if (res)
- release_mem_region(res->start,
- resource_size(res));
- if (virtbase)
- iounmap(virtbase);
-
- if (base) {
- kfree(base->lcla_pool.alloc_map);
- kfree(base->reg_val_backup_chan);
- kfree(base->lookup_log_chans);
- kfree(base->lookup_phy_chans);
- kfree(base->phy_res);
- kfree(base);
- }
-
return NULL;
}

--
2.10.0