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Fri, 04 Oct 2024 16:37:25 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e1e85da3f0sm2248715a91.30.2024.10.04.16.37.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Oct 2024 16:37:24 -0700 (PDT) Message-ID: <4b8302db-be90-48aa-8d10-16b961458a2d@broadcom.com> Date: Fri, 4 Oct 2024 16:37:23 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] phy: usb: Fix missing elements in BCM4908 USB init array To: Sam Edwards Cc: Justin Chen , Al Cooper , Broadcom internal kernel review list , Vinod Koul , Kishon Vijay Abraham I , linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org References: <20241004034131.1363813-1-CFSworks@gmail.com> <20241004034131.1363813-2-CFSworks@gmail.com> Content-Language: en-US From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 10/4/24 16:35, Sam Edwards wrote: > On Fri, Oct 4, 2024 at 9:14 AM Florian Fainelli > wrote: >> >> On 10/3/24 20:41, Sam Edwards wrote: >>> The Broadcom USB PHY driver contains a lookup table >>> (`reg_bits_map_tables`) to resolve register bitmaps unique to certain >>> versions of the USB PHY as found in various Broadcom chip families. A >>> recent commit (see 'fixes' tag) introduced two new elements to each chip >>> family in this table -- except for one: BCM4908. This resulted in the >>> xHCI controller not being initialized correctly, causing a panic on >>> boot. >> >> Yes, I think I see what happened here, we took the patch in the "fixes" >> tag from the our downstream tree, and it applied just fine, we will keep >> a closer eye on other entries in the future. >> >>> >>> The next patch will update this table to use designated initializers in >>> order to prevent this from happening again. For now, just add back the >>> missing array elements to resolve the regression. >> >> Out of curiosity, can you check whether building with >> -Wmissing-field-initializers would have caught this? > > It appears that the answer is no, at least here on Clang. I also just > tried -Wextra to see if any warning would catch it and didn't see one. > My understanding is that -Wmissing-field-initializers is for struct > fields, and a construct like: > int array[3] = {1, 2}; > ...does not result in a warning because it's considered perfectly > valid standards-compliant C per C's default initialization rule. I suspected that much, thanks for having checked! -- Florian