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uio: pruss: fix error handling in probe 

There are two bugs here.  First the error codes weren't set on several
paths.  And second, if the call to request_threaded_irq() inside
uio_register_device() fails then it would lead to a double free when
we call uio_unregister_device() inside pruss_cleanup().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2018-08-02 10:15:58 +03:00 committed by Greg Kroah-Hartman
parent 7ceb1c3753
commit 95883676e3
1 changed files with 45 additions and 24 deletions
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69
drivers/uio/uio_pruss.c
View File

@ -122,7 +122,7 @@ static int pruss_probe(struct platform_device *pdev)
struct uio_pruss_dev *gdev;
struct resource *regs_prussio;
struct device *dev = &pdev->dev;
int ret = -ENODEV, cnt = 0, len;
int ret, cnt, i, len;
struct uio_pruss_pdata *pdata = dev_get_platdata(dev);
gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL);
@ -131,8 +131,8 @@ static int pruss_probe(struct platform_device *pdev)
gdev->info = kcalloc(MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL);
if (!gdev->info) {
kfree(gdev);
return -ENOMEM;
ret = -ENOMEM;
goto err_free_gdev;
}
/* Power on PRU in case its not done as part of boot-loader */
@ -140,29 +140,26 @@ static int pruss_probe(struct platform_device *pdev)
if (IS_ERR(gdev->pruss_clk)) {
dev_err(dev, "Failed to get clock\n");
ret = PTR_ERR(gdev->pruss_clk);
kfree(gdev->info);
kfree(gdev);
return ret;
} else {
ret = clk_enable(gdev->pruss_clk);
if (ret) {
dev_err(dev, "Failed to enable clock\n");
clk_put(gdev->pruss_clk);
kfree(gdev->info);
kfree(gdev);
return ret;
}
goto err_free_info;
}
ret = clk_enable(gdev->pruss_clk);
if (ret) {
dev_err(dev, "Failed to enable clock\n");
goto err_clk_put;
}
regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs_prussio) {
dev_err(dev, "No PRUSS I/O resource specified\n");
goto out_free;
ret = -EIO;
goto err_clk_disable;
}
if (!regs_prussio->start) {
dev_err(dev, "Invalid memory resource\n");
goto out_free;
ret = -EIO;
goto err_clk_disable;
}
if (pdata->sram_pool) {
@ -172,7 +169,8 @@ static int pruss_probe(struct platform_device *pdev)
sram_pool_sz, &gdev->sram_paddr);
if (!gdev->sram_vaddr) {
dev_err(dev, "Could not allocate SRAM pool\n");
goto out_free;
ret = -ENOMEM;
goto err_clk_disable;
}
}
@ -180,14 +178,16 @@ static int pruss_probe(struct platform_device *pdev)
&(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);
if (!gdev->ddr_vaddr) {
dev_err(dev, "Could not allocate external memory\n");
goto out_free;
ret = -ENOMEM;
goto err_free_sram;
}
len = resource_size(regs_prussio);
gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
if (!gdev->prussio_vaddr) {
dev_err(dev, "Can't remap PRUSS I/O address range\n");
goto out_free;
ret = -ENOMEM;
goto err_free_ddr_vaddr;
}
gdev->pintc_base = pdata->pintc_base;
@ -215,15 +215,36 @@ static int pruss_probe(struct platform_device *pdev)
p->priv = gdev;
ret = uio_register_device(dev, p);
if (ret < 0)
goto out_free;
if (ret < 0) {
kfree(p->name);
goto err_unloop;
}
}
platform_set_drvdata(pdev, gdev);
return 0;
out_free:
pruss_cleanup(dev, gdev);
err_unloop:
for (i = 0, p = gdev->info; i < cnt; i++, p++) {
uio_unregister_device(p);
kfree(p->name);
}
iounmap(gdev->prussio_vaddr);
err_free_ddr_vaddr:
dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
gdev->ddr_paddr);
err_free_sram:
if (pdata->sram_pool)
gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz);
err_clk_disable:
clk_disable(gdev->pruss_clk);
err_clk_put:
clk_put(gdev->pruss_clk);
err_free_info:
kfree(gdev->info);
err_free_gdev:
kfree(gdev);
return ret;
}