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[92.34.216.5]) by smtp.gmail.com with ESMTPSA id e7-20020ac25467000000b004d4d7fb0e07sm2892044lfn.216.2023.04.27.05.10.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Apr 2023 05:10:05 -0700 (PDT) From: Linus Walleij Date: Thu, 27 Apr 2023 14:10:02 +0200 Subject: [PATCH v2 7/8] dmaengine: ste_dma40: Return error codes properly MIME-Version: 1.0 Message-Id: <20230417-ux500-dma40-cleanup-v2-7-cdaa68a4b863@linaro.org> References: <20230417-ux500-dma40-cleanup-v2-0-cdaa68a4b863@linaro.org> In-Reply-To: <20230417-ux500-dma40-cleanup-v2-0-cdaa68a4b863@linaro.org> To: Vinod Koul , Rob Herring , Krzysztof Kozlowski Cc: dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Linus Walleij X-Mailer: b4 0.12.2 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org 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 --- 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 */