linux-kernel - Re: [PATCH] dmaengine: ti: k3-udma: Use cap_mask directly from dma

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Message-ID: <77329c0d-2839-4af3-aa71-f65cc96864b7@ti.com>
Date: Thu, 3 Apr 2025 13:05:23 +0530
From: Yemike Abhilash Chandra <y-abhilashchandra@...com>
To: <peter.ujfalusi@...il.com>, <vkoul@...nel.org>
CC: <vaishnav.a@...com>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, "Kumar, Udit" <u-kumar1@...com>
Subject: Re: [PATCH] dmaengine: ti: k3-udma: Use cap_mask directly from
 dma_device structure instead of a local copy

Hi Vinod,

On 03/02/25 19:02, Kumar, Udit wrote:
> 
> On 2/3/2025 1:19 PM, Yemike Abhilash Chandra wrote:
>> Currently, a local dma_cap_mask_t variable is used to store device
>> cap_mask within udma_of_xlate(). However, the DMA_PRIVATE flag in
>> the device cap_mask can get cleared when the last channel is released.
>> This can happen right after storing the cap_mask locally in
>> udma_of_xlate(), and subsequent dma_request_channel() can fail due to
>> mismatch in the cap_mask. Fix this by removing the local dma_cap_mask_t
>> variable and directly using the one from the dma_device structure.
>>
>> Fixes: 25dcb5dd7b7c ("dmaengine: ti: New driver for K3 UDMA")
>> Cc: stable@...r.kernel.org
> 
> I don't see  patch is sent to stable in cc , please check if you 
> suppressed cc list.
> 
> For rest
> 
> Reviewed-by: Udit Kumar <u-kumar1@...com>
> 

May I kindly ask if this patch is in line to be merged for the 6.15 window?
I just wanted to check if you are waiting for anything.

Please let me know if you prefer me to resend the patch.
I can do that as well.

Thanks and Regards
Yemike Abhilash Chandra


>> Signed-off-by: Vaishnav Achath <vaishnav.a@...com>
>> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@...com>
>> Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>
>> ---
>> RFC: 
>> https://lore.kernel.org/all/20250117121728.203452-1-y-abhilashchandra@ti.com/
>>
>>   drivers/dma/ti/k3-udma.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
>> index 7ed1956b4642..c775a2284e86 100644
>> --- a/drivers/dma/ti/k3-udma.c
>> +++ b/drivers/dma/ti/k3-udma.c
>> @@ -4246,7 +4246,6 @@ static struct dma_chan *udma_of_xlate(struct 
>> of_phandle_args *dma_spec,
>>                         struct of_dma *ofdma)
>>   {
>>       struct udma_dev *ud = ofdma->of_dma_data;
>> -    dma_cap_mask_t mask = ud->ddev.cap_mask;
>>       struct udma_filter_param filter_param;
>>       struct dma_chan *chan;
>> @@ -4278,7 +4277,7 @@ static struct dma_chan *udma_of_xlate(struct 
>> of_phandle_args *dma_spec,
>>           }
>>       }
>> -    chan = __dma_request_channel(&mask, udma_dma_filter_fn, 
>> &filter_param,
>> +    chan = __dma_request_channel(&ud->ddev.cap_mask, 
>> udma_dma_filter_fn, &filter_param,
>>                        ofdma->of_node);
>>       if (!chan) {
>>           dev_err(ud->dev, "get channel fail in %s.\n", __func__);