Hi Hans,
On 21-Oct-21 23:48, Hans de Goede wrote:
> [CAUTION: External Email]
>
> Hi,
>
> On 10/21/21 11:29, Sanket Goswami wrote:
>> Store the root port information in amd_pmc_probe() so that the
>> information can be used across multiple routines.
>>
>> Signed-off-by: Sanket Goswami <Sanket.Goswami@xxxxxxx>
>> ---
>> Changes in v2:
>> - Store the rdev info in amd_pmc_probe() as suggested by Hans.
>
> Thank you, but there are still some issues, see below.
>
>
>> drivers/platform/x86/amd-pmc.c | 4 +++-
>> 1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c
>> index 55f14bdfdbfd..502f37eaba1f 100644
>> --- a/drivers/platform/x86/amd-pmc.c
>> +++ b/drivers/platform/x86/amd-pmc.c
>> @@ -119,6 +119,7 @@ struct amd_pmc_dev {
>> u16 minor;
>> u16 rev;
>> struct device *dev;
>> + struct pci_dev *rdev;
>> struct mutex lock; /* generic mutex lock */
>> #if IS_ENABLED(CONFIG_DEBUG_FS)
>> struct dentry *dbgfs_dir;
>> @@ -482,6 +483,7 @@ static int amd_pmc_probe(struct platform_device *pdev)
>> return -ENODEV;
>> }
>>
>> + dev->rdev = rdev;
>> dev->cpu_id = rdev->device;
>> err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_LO);
>> if (err) {
>> @@ -512,7 +514,6 @@ static int amd_pmc_probe(struct platform_device *pdev)
>> }
>>
>> base_addr_hi = val & AMD_PMC_BASE_ADDR_LO_MASK;
>> - pci_dev_put(dev->rdev);
>
> The current code here actually reads:
>
> pci_dev_put(rdev);
>
> Note (rdev) not (dev->rdev). I don't know what you based this on, this is weird.
rdev is already retrieved before doing this:
pci_dev_put(dev->rdev);
i.e.
in amd_pmc_probe()
rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
if (!rdev || !pci_match_id(pmc_pci_ids, rdev)) {
pci_dev_put(rdev);
return -ENODEV;
}
after this I am storing rdev in "dev->rdev"
i.e.
dev->rdev = rdev;
after this I am using "dev->rdev" at places where "rdev" was getting used earlier.
Do you see any problem?
>
> Also there are a bunch of error-exits from amd_pmc_probe() which not all
> need a "pci_dev_put(rdev)" added to them before there "return ERROR;"
> statement.
>
> It would be best to add:
>
> err_pci_dev_put:
> pci_dev_put(rdev);
> return err;
>
> Add the end off the function (after the return 0;) and replace all
> "return FOO" error-exits with:
>
> err = <FOO>;
> goto err_pci_dev_put;
> }
>
Thank you, will take it as a separate patch in v3.
Thanks,
Sanket
