Hello,
On 23.03.21 15:07, Greg Kroah-Hartman wrote:
> On Fri, Mar 19, 2021 at 12:04:58PM +0100, Ahmad Fatoum wrote:
>> We now have three places within the same file doing the same operation
>> of freeing this pointer and setting it anew. A helper make this
>> arguably easier to read, so add one.
>>
>> Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
>> ---
>> v1 -> v2:
>> - no change
>> ---
>> drivers/base/dd.c | 17 +++++++++++------
>> 1 file changed, 11 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
>> index e2cf3b29123e..4201baa1cc13 100644
>> --- a/drivers/base/dd.c
>> +++ b/drivers/base/dd.c
>> @@ -69,6 +69,12 @@ static char
>> async_probe_drv_names[ASYNC_DRV_NAMES_MAX_LEN];
>> */
>> static bool defer_all_probes;
>>
>> +static void __device_set_deferred_probe_reason(const struct device *dev,
>> char *reason)
>> +{
>> + kfree(dev->p->deferred_probe_reason);
>> + dev->p->deferred_probe_reason = reason;
>> +}
>> +
>> /*
>> * deferred_probe_work_func() - Retry probing devices in the active list.
>> */
>> @@ -97,8 +103,7 @@ static void deferred_probe_work_func(struct work_struct
>> *work)
>>
>> get_device(dev);
>>
>> - kfree(dev->p->deferred_probe_reason);
>> - dev->p->deferred_probe_reason = NULL;
>> + __device_set_deferred_probe_reason(dev, NULL);
>>
>> /*
>> * Drop the mutex while probing each device; the probe path may
>> @@ -140,8 +145,7 @@ void driver_deferred_probe_del(struct device *dev)
>> if (!list_empty(&dev->p->deferred_probe)) {
>> dev_dbg(dev, "Removed from deferred list\n");
>> list_del_init(&dev->p->deferred_probe);
>> - kfree(dev->p->deferred_probe_reason);
>> - dev->p->deferred_probe_reason = NULL;
>> + __device_set_deferred_probe_reason(dev, NULL);
>> }
>> mutex_unlock(&deferred_probe_mutex);
>> }
>> @@ -220,11 +224,12 @@ void device_unblock_probing(void)
>> void device_set_deferred_probe_reason(const struct device *dev, struct
>> va_format *vaf)
>> {
>> const char *drv = dev_driver_string(dev);
>> + char *reason;
>>
>> mutex_lock(&deferred_probe_mutex);
>>
>> - kfree(dev->p->deferred_probe_reason);
>> - dev->p->deferred_probe_reason = kasprintf(GFP_KERNEL, "%s: %pV", drv,
>> vaf);
>> + reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf);
>
> No error checking?
There wasn't any before and I think silent failure to set the defer reason
is completely adequate behavior.
Cheers,
Ahmad
>
> :(
>
>
--
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