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SubjectRe: [PATCH v2] PCI: v3: fix missing clk_disable_unprepare() on error in v3_pci_probe
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在 2020/11/3 22:16, Rob Herring 写道:
> On Tue, Nov 3, 2020 at 1:28 AM Qinglang Miao <miaoqinglang@huawei.com> wrote:
>>
>> Fix the missing clk_disable_unprepare() before return
>> from v3_pci_probe() in the error handling case.
>>
>> Moving the clock enable later to avoid some fixes.
>>
>> Fixes: 6e0832fa432e (" PCI: Collect all native drivers under drivers/pci/controller/")
>
> I don't think this commit caused the problem.
>
>> Suggested-by: Rob Herring <robh@kernel.org>
>> Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
>> ---
>> drivers/pci/controller/pci-v3-semi.c | 40 ++++++++++++++++------------
>> 1 file changed, 23 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/pci/controller/pci-v3-semi.c b/drivers/pci/controller/pci-v3-semi.c
>> index 154a53986..90520555b 100644
>> --- a/drivers/pci/controller/pci-v3-semi.c
>> +++ b/drivers/pci/controller/pci-v3-semi.c
>> @@ -725,18 +725,6 @@ static int v3_pci_probe(struct platform_device *pdev)
>> host->sysdata = v3;
>> v3->dev = dev;
>>
>> - /* Get and enable host clock */
>> - clk = devm_clk_get(dev, NULL);
>> - if (IS_ERR(clk)) {
>> - dev_err(dev, "clock not found\n");
>> - return PTR_ERR(clk);
>> - }
>> - ret = clk_prepare_enable(clk);
>> - if (ret) {
>> - dev_err(dev, "unable to enable clock\n");
>> - return ret;
>> - }
>> -
>> regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> v3->base = devm_ioremap_resource(dev, regs);
>> if (IS_ERR(v3->base))
>> @@ -761,17 +749,31 @@ static int v3_pci_probe(struct platform_device *pdev)
>> if (IS_ERR(v3->config_base))
>> return PTR_ERR(v3->config_base);
>>
>> + /* Get and enable host clock */
>> + clk = devm_clk_get(dev, NULL);
>> + if (IS_ERR(clk)) {
>> + dev_err(dev, "clock not found\n");
>> + return PTR_ERR(clk);
>> + }
>> + ret = clk_prepare_enable(clk);
>> + if (ret) {
>> + dev_err(dev, "unable to enable clock\n");
>> + return ret;
>> + }
>> +
>> /* Get and request error IRQ resource */
>> irq = platform_get_irq(pdev, 0);
>> - if (irq < 0)
>> + if (irq < 0) {
>> + clk_disable_unprepare(clk);
>> return irq;
>> -
>> + }
>> ret = devm_request_irq(dev, irq, v3_irq, 0,
>> "PCIv3 error", v3);
>> if (ret < 0) {
>> dev_err(dev,
>> "unable to request PCIv3 error IRQ %d (%d)\n",
>> irq, ret);
>> + clk_disable_unprepare(clk);
>> return ret;
>> }
>>
>> @@ -814,13 +816,15 @@ static int v3_pci_probe(struct platform_device *pdev)
>> ret = v3_pci_setup_resource(v3, host, win);
>> if (ret) {
>> dev_err(dev, "error setting up resources\n");
>> + clk_disable_unprepare(clk);
>> return ret;
>> }
>> }
>> ret = v3_pci_parse_map_dma_ranges(v3, np);
>> - if (ret)
>> + if (ret) {
>> + clk_disable_unprepare(clk);
>> return ret;
>> -
>> + }
>> /*
>> * Disable PCI to host IO cycles, enable I/O buffers @3.3V,
>> * set AD_LOW0 to 1 if one of the LB_MAP registers choose
>> @@ -862,8 +866,10 @@ static int v3_pci_probe(struct platform_device *pdev)
>> /* Special Integrator initialization */
>> if (of_device_is_compatible(np, "arm,integrator-ap-pci")) {
>> ret = v3_integrator_init(v3);
>> - if (ret)
>> + if (ret) {
>> + clk_disable_unprepare(clk);
>
> You should make all these a goto and just have one clk_disable_unprepare() call.
>
> You are still missing error handling after pci_host_probe().

I made a mistake on author name on v3 so resent a v4 on this one.

Sorry about that.
>
>> return ret;
>> + }
>> }
>>
>> /* Post-init: enable PCI memory and invalidate (master already on) */
>> --
>> 2.23.0
>>
> .
>

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