Received-SPF: pass (google.com: domain of linux-kernel+bounces-102370-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
Message-ID: <9420b802-5361-4f47-a069-52c43f5fd253@broadcom.com>
Date: Wed, 13 Mar 2024 11:37:45 -0700
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH] spi: Fix error code checking in spi_mem_exec_op()
To: Pratyush Yadav <pratyush@kernel.org>, Michael Walle <mwalle@kernel.org>
Cc: linux-spi@vger.kernel.org, Mark Brown <broonie@kernel.org>,
 Miquel Raynal <miquel.raynal@bootlin.com>,
 Mika Westerberg <mika.westerberg@linux.intel.com>,
 "Chia-Lin Kao (AceLan)" <acelan.kao@canonical.com>,
 open list <linux-kernel@vger.kernel.org>
References: <20240313171050.3505620-1-florian.fainelli@broadcom.com>
 <CZSSWP7A9UM7.1R20796VHLU0F@kernel.org> <mafs0o7bic7fs.fsf@kernel.org>
From: Florian Fainelli <florian.fainelli@broadcom.com>
Autocrypt: addr=florian.fainelli@broadcom.com; keydata=
 xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT
 M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs
 JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ
 PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ
 KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB
 AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB
 IQQQAQgAywUCZWl41AUJI+Jo+hcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFr
 ZXktdXNhZ2UtbWFza0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2Rp
 bmdAcGdwLmNvbXBncG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29t
 Lm5ldAUbAwAAAAMWAgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagAAoJEIEx
 tcQpvGagWPEH/2l0DNr9QkTwJUxOoP9wgHfmVhqc0ZlDsBFv91I3BbhGKI5UATbipKNqG13Z
 TsBrJHcrnCqnTRS+8n9/myOF0ng2A4YT0EJnayzHugXm+hrkO5O9UEPJ8a+0553VqyoFhHqA
 zjxj8fUu1px5cbb4R9G4UAySqyeLLeqnYLCKb4+GklGSBGsLMYvLmIDNYlkhMdnnzsSUAS61
 WJYW6jjnzMwuKJ0ZHv7xZvSHyhIsFRiYiEs44kiYjbUUMcXor/uLEuTIazGrE3MahuGdjpT2
 IOjoMiTsbMc0yfhHp6G/2E769oDXMVxCCbMVpA+LUtVIQEA+8Zr6mX0Yk4nDS7OiBlvOwE0E
 U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k
 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU
 pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs
 MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh
 IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB
 gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+
 obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P
 N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s
 CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm
 C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5
 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5
 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb
 fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc
 MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC
 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww
 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us=
In-Reply-To: <mafs0o7bic7fs.fsf@kernel.org>
Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256;
	boundary="0000000000004cd7d106138f1251"

--0000000000004cd7d106138f1251
Content-Language: en-US
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

On 3/13/24 11:28, Pratyush Yadav wrote:
> On Wed, Mar 13 2024, Michael Walle wrote:
> 
>> On Wed Mar 13, 2024 at 6:10 PM CET, Florian Fainelli wrote:
>>> After commit cff49d58f57e ("spi: Unify error codes by replacing -ENOTSUPP with
>>> -EOPNOTSUPP"), our SPI NOR flashes would stop probing with the following
>>> visible in the kernel log:
>>>
>>> [    2.196300] brcmstb_qspi f0440920.qspi: using bspi-mspi mode
>>> [    2.210295] spi-nor: probe of spi1.0 failed with error -95
>>>
>>> It turns out that the check in spi_mem_exec_op() was changed to check
>>> for -ENOTSUPP (old error code) or -EOPNOTSUPP (new error code), but this
>>> means that for drivers that were converted, the second condition is now
>>> true, and we stop falling through like we used to. Fix the error to
>>> check for neither error being neither -ENOTSUPP *nor* -EOPNOTSUPP.
>>>
>>> Fixes: cff49d58f57e ("spi: Unify error codes by replacing -ENOTSUPP with -EOPNOTSUPP")
>>> Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
>>> Change-Id: I4159811f6c582c4de2143382473d2000b8755872
>>
>> Ha, thank you!
>>
>> Reviewed-by: Michael Walle <mwalle@kernel.org>
>>
>> FWIW in next, there is commit
>> e63aef9c9121e ("spi: spi-mem: add statistics support to ->exec_op() calls")
>> that probably will conflict with this one.
>>
>> Also, - not for this patch - but with that logic, spi_mem_exec_op()
>> might return EOPNOTSUPP *or* ENOTSUPP, even for drivers which might
>> still return ENOTSUPP, because there is one condition in
>> spi_mem_exec_op() which will always return EOPNOTSUPP. That is
>> somewhat confusing, no?
> 
> I agree. I suppose it would be better to do:
> 
>      if (!ret)
>         return 0;
> 
>      if (ret == -ENOTSUPP || ret == -EOPNOTSUPP)
>         return -EOPNOTSUPP;
> 

But with e63aef9c9121e ("spi: spi-mem: add statistics support to 
->exec_op() calls") applied, would not that mean duplicating the 
statistics gathering, or were the statistics gathering only intended for 
when ret == 0?
-- 
Florian


--0000000000004cd7d106138f1251
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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--0000000000004cd7d106138f1251--