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Message-Id: <20230417-ux500-dma40-cleanup-v2-7-cdaa68a4b863@linaro.org>
Date: Thu, 27 Apr 2023 14:10:02 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 7/8] dmaengine: ste_dma40: Return error codes properly
This makes the probe() and its subfunction d40_hw_detect_init()
return proper error codes.
One effect of this is that deferred probe, e.g from the clock,
will start to work, would it happen. Also it is better design.
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
drivers/dma/ste_dma40.c | 46 ++++++++++++++++++++++++----------------------
1 file changed, 24 insertions(+), 22 deletions(-)
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index c5991009d3e4..2911017265cf 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3132,7 +3132,8 @@ static void d40_drop_kmem_cache_action(void *d)
kmem_cache_destroy(desc_slab);
}
-static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
+static int __init d40_hw_detect_init(struct platform_device *pdev,
+ struct d40_base **retbase)
{
struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
struct device *dev = &pdev->dev;
@@ -3150,14 +3151,12 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
clk = devm_clk_get_enabled(dev, NULL);
if (IS_ERR(clk))
- return NULL;
+ return PTR_ERR(clk);
/* Get IO for DMAC base address */
virtbase = devm_platform_ioremap_resource_byname(pdev, "base");
- if (IS_ERR(virtbase)) {
- dev_err(dev, "No IO base defined\n");
- return NULL;
- }
+ if (IS_ERR(virtbase))
+ return PTR_ERR(virtbase);
/* This is just a regular AMBA PrimeCell ID actually */
for (pid = 0, i = 0; i < 4; i++)
@@ -3169,13 +3168,13 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
if (cid != AMBA_CID) {
d40_err(dev, "Unknown hardware! No PrimeCell ID\n");
- return NULL;
+ return -EINVAL;
}
if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) {
d40_err(dev, "Unknown designer! Got %x wanted %x\n",
AMBA_MANF_BITS(pid),
AMBA_VENDOR_ST);
- return NULL;
+ return -EINVAL;
}
/*
* HW revision:
@@ -3189,7 +3188,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
rev = AMBA_REV_BITS(pid);
if (rev < 2) {
d40_err(dev, "hardware revision: %d is not supported", rev);
- return NULL;
+ return -EINVAL;
}
/* The number of physical channels on this HW */
@@ -3216,7 +3215,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
sizeof(struct d40_chan), GFP_KERNEL);
if (!base)
- return NULL;
+ return -ENOMEM;
base->rev = rev;
base->clk = clk;
@@ -3263,51 +3262,53 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
sizeof(*base->phy_res),
GFP_KERNEL);
if (!base->phy_res)
- return NULL;
+ return -ENOMEM;
base->lookup_phy_chans = devm_kcalloc(dev, num_phy_chans,
sizeof(*base->lookup_phy_chans),
GFP_KERNEL);
if (!base->lookup_phy_chans)
- return NULL;
+ return -ENOMEM;
base->lookup_log_chans = devm_kcalloc(dev, num_log_chans,
sizeof(*base->lookup_log_chans),
GFP_KERNEL);
if (!base->lookup_log_chans)
- return NULL;
+ return -ENOMEM;
base->reg_val_backup_chan = devm_kmalloc_array(dev, base->num_phy_chans,
sizeof(d40_backup_regs_chan),
GFP_KERNEL);
if (!base->reg_val_backup_chan)
- return NULL;
+ return -ENOMEM;
base->lcla_pool.alloc_map = devm_kcalloc(dev, num_phy_chans
* D40_LCLA_LINK_PER_EVENT_GRP,
sizeof(*base->lcla_pool.alloc_map),
GFP_KERNEL);
if (!base->lcla_pool.alloc_map)
- return NULL;
+ return -ENOMEM;
base->regs_interrupt = devm_kmalloc_array(dev, base->gen_dmac.il_size,
sizeof(*base->regs_interrupt),
GFP_KERNEL);
if (!base->regs_interrupt)
- return NULL;
+ return -ENOMEM;
base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
0, SLAB_HWCACHE_ALIGN,
NULL);
if (!base->desc_slab)
- return NULL;
+ return -ENOMEM;
ret = devm_add_action_or_reset(dev, d40_drop_kmem_cache_action,
base->desc_slab);
if (ret)
- return NULL;
+ return ret;
+
+ *retbase = base;
- return base;
+ return 0;
}
static void __init d40_hw_init(struct d40_base *base)
@@ -3503,20 +3504,20 @@ static int __init d40_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
struct device_node *np_lcpa;
- int ret = -ENOENT;
struct d40_base *base;
struct resource *res;
struct resource res_lcpa;
int num_reserved_chans;
u32 val;
+ int ret;
if (d40_of_probe(dev, np)) {
ret = -ENOMEM;
goto report_failure;
}
- base = d40_hw_detect_init(pdev);
- if (!base)
+ ret = d40_hw_detect_init(pdev, &base);
+ if (ret)
goto report_failure;
num_reserved_chans = d40_phy_res_init(base);
@@ -3530,6 +3531,7 @@ static int __init d40_probe(struct platform_device *pdev)
np_lcpa = of_parse_phandle(np, "sram", 0);
if (!np_lcpa) {
dev_err(dev, "no LCPA SRAM node\n");
+ ret = -EINVAL;
goto report_failure;
}
/* This is no device so read the address directly from the node */
--
2.40.0
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