netdev - Re: [PATCH net v5 2/2] net/ps3_gelic_net: Use dma_mapping

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Date:   Sat, 25 Feb 2023 16:16:45 -0800
From:   Geoff Levand <geoff@...radead.org>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net v5 2/2] net/ps3_gelic_net: Use dma_mapping_error

Hi,

On 2/14/23 09:28, Alexander Lobakin wrote:
> From: Geoff Levand <geoff@...radead.org>
> Date: Sun, 12 Feb 2023 18:00:58 +0000
> 
>> The current Gelic Etherenet driver was checking the return value of its
>> dma_map_single call, and not using the dma_mapping_error() routine.
>>
>> Fixes runtime problems like these:
>>
>>   DMA-API: ps3_gelic_driver sb_05: device driver failed to check map error
>>   WARNING: CPU: 0 PID: 0 at kernel/dma/debug.c:1027 .check_unmap+0x888/0x8dc
>>
>> Fixes: 02c1889166b4 (ps3: gigabit ethernet driver for PS3, take3)
>> Signed-off-by: Geoff Levand <geoff@...radead.org>
>> ---
>>  drivers/net/ethernet/toshiba/ps3_gelic_net.c | 41 ++++++++++----------
>>  1 file changed, 20 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
>> index 2bb68e60d0d5..0e52bb99e344 100644
>> --- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c
>> +++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c

>> -		if (!descr->bus_addr)
>> -			goto iommu_error;
>> +		if (unlikely(dma_mapping_error(dev, descr->bus_addr))) {
> 
> dma_mapping_error() already has unlikely() inside.

OK, I'll remove that in the next patch set.

>> +			dev_err(dev, "%s:%d: dma_mapping_error\n", __func__,
>> +				__LINE__);

> It is fast path. You're not allowed to use plain printk on fast path,
> since you may generate then thousands of messages per second.
> Consider looking at _ratelimit family of functions.

OK, I'll fix that.

Thanks for the review.

-Geoff