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Subject[PATCH v2] bus: hisi_lpc: fix missing platform_device_put() in hisi_lpc_acpi_probe()
Date
In error case in hisi_lpc_acpi_probe() after calling platform_device_alloc(),
if platform_device_add() is not called successfully, hisi_lpc_acpi_remove()
can't release the failed 'pdev' including its resource and data, so they will
be leaked, call platform_device_put() to put the refcount, then they will be
freed in platform_device_release().
I'v constructed this error case and tested this patch on D05 board.

Fixes: 99c0228d6ff1 ("HISI LPC: Re-Add ACPI child enumeration support")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
v2:
- keep declartion of pdev reverse-firtree ordering
- update commit message
---
drivers/bus/hisi_lpc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
index 378f5d62a991..05e9357bf006 100644
--- a/drivers/bus/hisi_lpc.c
+++ b/drivers/bus/hisi_lpc.c
@@ -502,6 +502,7 @@ static void hisi_lpc_acpi_remove(struct device *hostdev)
static int hisi_lpc_acpi_probe(struct device *hostdev)
{
struct acpi_device *adev = ACPI_COMPANION(hostdev);
+ struct platform_device *pdev;
struct acpi_device *child;
int ret;

@@ -509,7 +510,6 @@ static int hisi_lpc_acpi_probe(struct device *hostdev)
list_for_each_entry(child, &adev->children, node) {
const char *hid = acpi_device_hid(child);
const struct hisi_lpc_acpi_cell *cell;
- struct platform_device *pdev;
const struct resource *res;
bool found = false;
int num_res;
@@ -571,22 +571,24 @@ static int hisi_lpc_acpi_probe(struct device *hostdev)

ret = platform_device_add_resources(pdev, res, num_res);
if (ret)
- goto fail;
+ goto fail_put_device;

ret = platform_device_add_data(pdev, cell->pdata,
cell->pdata_size);
if (ret)
- goto fail;
+ goto fail_put_device;

ret = platform_device_add(pdev);
if (ret)
- goto fail;
+ goto fail_put_device;

acpi_device_set_enumerated(child);
}

return 0;

+fail_put_device:
+ platform_device_put(pdev);
fail:
hisi_lpc_acpi_remove(hostdev);
return ret;
--
2.25.1
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