[U-Boot] [PATCH 1/9] mtd: Add a function to report when the MTD dev list has been updated

[Heiko Schocher]

Hello Boris,

Am 19.11.2018 um 13:40 schrieb Boris Brezillon:
> Crap! I forgot to pass -v2 to git format patch.

:-P

Do you use u-boot:/tools/patman ?

bye,
Heiko
> 
> On Mon, 19 Nov 2018 12:51:13 +0100
> Boris Brezillon <boris.brezillon at bootlin.com> wrote:
> 
>> We need to parse mtdparts/mtids again everytime a device has been
>> added/removed from the MTD list, but there's currently no way to know
>> when such an update has been done.
>>
>> Add an ->updated field to the idr struct that we set to true every time
>> a device is added/removed and expose a function returning the value
>> of this field and resetting it to false.
>>
>> Signed-off-by: Boris Brezillon <boris.brezillon at bootlin.com>
>> ---
>> Changes in v2:
>> - None
>> ---
>>   drivers/mtd/mtdcore.c   | 16 +++++++++++++++-
>>   include/linux/mtd/mtd.h |  1 +
>>   2 files changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
>> index fb6c779abbfe..7a15ded8c883 100644
>> --- a/drivers/mtd/mtdcore.c
>> +++ b/drivers/mtd/mtdcore.c
>> @@ -87,14 +87,17 @@ struct idr_layer {
>>   
>>   struct idr {
>>   	struct idr_layer id[MAX_IDR_ID];
>> +	bool updated;
>>   };
>>   
>>   #define DEFINE_IDR(name)	struct idr name;
>>   
>>   void idr_remove(struct idr *idp, int id)
>>   {
>> -	if (idp->id[id].used)
>> +	if (idp->id[id].used) {
>>   		idp->id[id].used = 0;
>> +		idp->updated = true;
>> +	}
>>   
>>   	return;
>>   }
>> @@ -134,6 +137,7 @@ int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t gfp_mask)
>>   		if (idl->used == 0) {
>>   			idl->used = 1;
>>   			idl->ptr = ptr;
>> +			idp->updated = true;
>>   			return i;
>>   		}
>>   		i++;
>> @@ -155,6 +159,16 @@ struct mtd_info *__mtd_next_device(int i)
>>   }
>>   EXPORT_SYMBOL_GPL(__mtd_next_device);
>>   
>> +bool mtd_dev_list_updated(void)
>> +{
>> +	if (mtd_idr.updated) {
>> +		mtd_idr.updated = false;
>> +		return true;
>> +	}
>> +
>> +	return false;
>> +}
>> +
>>   #ifndef __UBOOT__
>>   static LIST_HEAD(mtd_notifiers);
>>   
>> diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
>> index 68e591532492..d20ebd820289 100644
>> --- a/include/linux/mtd/mtd.h
>> +++ b/include/linux/mtd/mtd.h
>> @@ -581,6 +581,7 @@ int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
>>   void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
>>   			  const uint64_t length, uint64_t *len_incl_bad,
>>   			  int *truncated);
>> +bool mtd_dev_list_updated(void);
>>   
>>   /* drivers/mtd/mtd_uboot.c */
>>   int mtd_search_alternate_name(const char *mtdname, char *altname,
> 

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