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[35.194.125.76]) by smtp.gmail.com with ESMTPSA id g19-20020a170902869300b001b9e86e05b7sm10417565plo.0.2023.10.26.00.52.46 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 26 Oct 2023 00:52:46 -0700 (PDT) Received: from [::1] (helo=pc-zest.atmark.tech) by pc-zest.atmarktech with esmtp (Exim 4.96) (envelope-from ) id 1qvvAb-001jsj-13; Thu, 26 Oct 2023 16:52:45 +0900 From: Dominique Martinet Cc: Dominique Martinet , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Dominique Martinet , stable@vger.kernel.org, Avri Altman , Ulf Hansson , Alex Fetters Subject: [PATCH] mmc: truncate quirks' oemid to 8 bits Date: Thu, 26 Oct 2023 16:52:30 +0900 Message-Id: <20231026075230.414685-1-dominique.martinet@atmark-techno.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org We now only capture 8 bits for oemid in card->cid.oemid, so quirks that were filling up the full 16 bits up till now would no longer apply. Work around the problem by only checking for the bottom 8 bits when checking if quirks should be applied Fixes: 84ee19bffc93 ("mmc: core: Capture correct oemid-bits for eMMC cards") Link: https://lkml.kernel.org/r/ZToJsSLHr8RnuTHz@codewreck.org Signed-off-by: Dominique Martinet Cc: stable@vger.kernel.org Cc: Avri Altman Cc: Ulf Hansson Cc: Alex Fetters --- Notes: - mmc_fixup_device() was rewritten in 5.17, so older stable kernels will need a separate patch... I suppose I can send it to stable after this is merged if we go this way - struct mmc_cid's and mmc_fixup's oemid fields are unsigned shorts, we probably just want to make them unsigned char instead in which case we don't need that check anymore? But it's kind of nice to have a wider type so CID_OEMID_ANY can never be a match.... Which unfortunately my patch makes moot as ((unsigned short)-1) & 0xff will be 0xff which can match anything... - this could also be worked around in the _FIXUP_EXT macro that builds the fixup structs, but we're getting ugly here... Or we can just go for the big boom and try to fix all MMC_FIXUP() users in tree and call it a day, but that'll also be fun to backport. drivers/mmc/core/quirks.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h index 32b64b564fb1..27e0349e176d 100644 --- a/drivers/mmc/core/quirks.h +++ b/drivers/mmc/core/quirks.h @@ -211,8 +211,9 @@ static inline void mmc_fixup_device(struct mmc_card *card, if (f->manfid != CID_MANFID_ANY && f->manfid != card->cid.manfid) continue; + /* Only the bottom 8bits are valid in JESD84-B51 */ if (f->oemid != CID_OEMID_ANY && - f->oemid != card->cid.oemid) + (f->oemid & 0xff) != (card->cid.oemid & 0xff)) continue; if (f->name != CID_NAME_ANY && strncmp(f->name, card->cid.prod_name,