From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ixit.cz (ip-89-177-23-149.bb.vodafone.cz [89.177.23.149]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 80EBA1DE892; Sun, 9 Feb 2025 15:19:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=89.177.23.149 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739114400; cv=none; b=ZX5ZBVsZUl9uBUUD2PzqFeRydO/RhU33g7L9pAYnE0k7fKf4Zr0ct4/PrDQLiM1Lcu34Nhn3qN1T3pEn7REpvprSj1y2Cn44TMR/+CG8QIaFDA6t9ahYsrY5IO7imjWUuSLEUxKFm7L5FPmvFOG9NbUk/7Wq8wrtBA5uTi2vW4A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739114400; c=relaxed/simple; bh=2Reh71zztneGACpbLISz5V4Stqed8X57QnfeKJHY+0w=; h=Message-ID:Date:MIME-Version:To:Cc:References:Subject:From: In-Reply-To:Content-Type; b=KHJuohE7HKguTWMAqy9DJNthfAqHlV3qdA7BT+kUqGQ7/tKxWAw2rJGhwgDRmHPfBaw6e+RjeQMdSVA1zAVtBtcl1D9ZFXxdrvaAgIVWUfsLKp7XCXYoI/ID74X6JU3D0Z+9YFPx7uQSLgCtsz/cUeLaY9rsWQjg3+RDJT1WjRE= ARC-Authentication-Results:i=1; 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bh=G/Qh3CE9Z0937GjvloaGvas1w18VkO3vU8aAYRlhLqY=; b=ZkPYthcS9Gidw0pux1JgKvX3wkoBPJIngtjXW5Cc9qydvjc/V3Bji0Rf21WOxO48elGKeB U2KiQmyNYQ3A+Bx2bSvscyiAI6f1wa+QHS9984/T0GxuqztMKWkkEPG0Rit0eWu7GhriDK 3ibQNVDA6xumnSJ3SxSOKH408vmBrY4= Message-ID: <5cc3639f-2689-4e4a-a89b-02ade0efe966@ixit.cz> Date: Sun, 9 Feb 2025 16:19:53 +0100 Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta To: bjorn.andersson@oss.qualcomm.com Cc: djakov@kernel.org, dmaengine@vger.kernel.org, dmitry.baryshkov@linaro.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_mdalam@quicinc.com, vkoul@kernel.org References: <20250207-bam-read-fix-v1-1-027975cf1a04@oss.qualcomm.com> Subject: Re: [PATCH] dmaengine: qcom: bam_dma: Avoid accessing BAM_REVISION on remote BAM Content-Language: en-US Reply-To: 20250207-bam-read-fix-v1-1-027975cf1a04@oss.qualcomm.com From: David Heidelberg Autocrypt: addr=david@ixit.cz; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7.02.25 22:17, Bjorn Andersson wrote: > Commit '57a7138d0627 ("dmaengine: qcom: bam_dma: Avoid writing > unavailable register")' made this read unconditional, in order to > identify if the instance is BAM-NDP or BAM-Lite. > But the BAM_REVISION register is not accessible on remotely managed BAM > instances and attempts to access it causes the system to crash. > > Move the access back to be conditional and expand the checks that was > introduced to restore the old behavior when no revision information is > available. > > Fixes: 57a7138d0627 ("dmaengine: qcom: bam_dma: Avoid writing unavailable register") > Reported-by: Georgi Djakov > Closes: https://lore.kernel.org/lkml/9ef3daa8-cdb1-49f2-8d19-a72d6210ff3a@kernel.org/ > Signed-off-by: Bjorn Andersson Tested-by: David Heidelberg # OnePlus 6T -- David Heidelberg