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spi: microchip-core: fix and cleanups 

Merge series from Yang Yingliang <yangyingliang@huawei.com>:

Patch #1 fix a UAF in mchp_corespi_remove().
Patch #2 and #3 some cleanups to simpify code.
This commit is contained in:
Mark Brown 2022-07-13 15:19:13 +01:00
parent 7e9984d183 cdeaf3a99a
commit 1ed34d367b
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GPG Key ID: 24D68B725D5487D0
1 changed files with 20 additions and 36 deletions
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56
drivers/spi/spi-microchip-core.c
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@ -513,7 +513,7 @@ static int mchp_corespi_probe(struct platform_device *pdev)
u32 num_cs;
int ret = 0;
master = spi_alloc_master(&pdev->dev, sizeof(*spi));
master = devm_spi_alloc_master(&pdev->dev, sizeof(*spi));
if (!master)
return dev_err_probe(&pdev->dev, -ENOMEM,
"unable to allocate master for SPI controller\n");
@ -535,58 +535,44 @@ static int mchp_corespi_probe(struct platform_device *pdev)
spi = spi_master_get_devdata(master);
spi->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(spi->regs)) {
ret = PTR_ERR(spi->regs);
goto error_release_master;
}
if (IS_ERR(spi->regs))
return PTR_ERR(spi->regs);
spi->irq = platform_get_irq(pdev, 0);
if (spi->irq <= 0) {
dev_err(&pdev->dev, "invalid IRQ %d for SPI controller\n", spi->irq);
ret = -ENXIO;
goto error_release_master;
}
if (spi->irq <= 0)
return dev_err_probe(&pdev->dev, -ENXIO,
"invalid IRQ %d for SPI controller\n",
spi->irq);
ret = devm_request_irq(&pdev->dev, spi->irq, mchp_corespi_interrupt,
IRQF_SHARED, dev_name(&pdev->dev), master);
if (ret) {
dev_err(&pdev->dev, "could not request irq: %d\n", ret);
goto error_release_master;
}
if (ret)
return dev_err_probe(&pdev->dev, ret,
"could not request irq: %d\n", ret);
spi->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(spi->clk)) {
ret = PTR_ERR(spi->clk);
dev_err(&pdev->dev, "could not get clk: %d\n", ret);
goto error_release_master;
}
if (IS_ERR(spi->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(spi->clk),
"could not get clk: %d\n", ret);
ret = clk_prepare_enable(spi->clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock\n");
goto error_release_master;
}
if (ret)
return dev_err_probe(&pdev->dev, ret,
"failed to enable clock\n");
mchp_corespi_init(master, spi);
ret = devm_spi_register_master(&pdev->dev, master);
if (ret) {
dev_err(&pdev->dev,
"unable to register master for SPI controller\n");
goto error_release_hardware;
mchp_corespi_disable(spi);
clk_disable_unprepare(spi->clk);
return dev_err_probe(&pdev->dev, ret,
"unable to register master for SPI controller\n");
}
dev_info(&pdev->dev, "Registered SPI controller %d\n", master->bus_num);
return 0;
error_release_hardware:
mchp_corespi_disable(spi);
clk_disable_unprepare(spi->clk);
error_release_master:
spi_master_put(master);
return ret;
}
static int mchp_corespi_remove(struct platform_device *pdev)
@ -595,8 +581,6 @@ static int mchp_corespi_remove(struct platform_device *pdev)
struct mchp_corespi *spi = spi_master_get_devdata(master);
mchp_corespi_disable_ints(spi);
spi_unregister_master(master);
spi_master_put(master);
clk_disable_unprepare(spi->clk);
mchp_corespi_disable(spi);