From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793408927; b=2kserRppunfPsYk4aNZtyW2S/LTiqHkD/rYYPk7fkFGQbktv0pIt4cuEsJ+fFR8fC2p+ z2u8CD+ekc5KyRWr2dzevxr9clt5dQBIk2lYYY4u7UVW/4FdZSU4jrqIRhGgR+G8pkEVu COtN2Tsz3rxdn+Dmjn0w/H1osqcNITA7OX4KcpTPse5TIWeuq8mY2ytuaLk/o6VskPRJ2 q/Ub5TeR7BsQnHGpcahWbI4pAfsn38425pzyD43exf8S1ytbK7HX71ZcWLABFMGjJ4HA8 mrPKB3G+i7INU1e8/uvKOc24jgX6RpUz7Qax0GFqF2w/Iya4TWlnD5Bbydo7LOHLgEw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793408927; h=Received:DKIM-Signature:To:Cc:Subject:From:In-Reply-To:Message-ID: References:Date:MIME-Version:Content-Type; bh=eViav/XowKysmIuwTl3kWVetVXdq1+mWSeIjuEUQMnk=; b=ND4sNYiNmnFmnCywOdY6PFYs6x8KunFwGDIYeEYaIFzCcIdgwWCMQse83U9ygIL1lrro YiO6KeHf/d7vre2uqWbSm7AD4S4noZvyAJxA0sIhtYQh3p580n7avQz+rw89F2cOL4ANE pLYo3HuxqH+UaorI0FdcbV++hXB8hL+EAbwrVSF+kwzGaAEiqRUMtpRJzT9sbSIcVELeH WuyGLRRLA7TRdTi25QRKbvLNasu75YNlO9TzxO9LsUrvIyAYwbVAvRMv1Ni/ZLh2Ov6nO laKzPdM8T9F24QhUrlN1HwuNn8xj3nO+oFprwi3ok3dRh6DpGLd2J23c+DsFKnuWfqg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=iFnVonJc; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 64F26606A31A; Sat, 31 Oct 2026 01:08:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=iFnVonJc Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBC481F000C1; Sat, 31 Oct 2026 01:08:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793408927; bh=eViav/XowKysmIuwTl3kWVetVXdq1+mWSeIjuEUQMnk=; h=To:Cc:Subject:From:In-Reply-To:References:Date; b=iFnVonJcX/fyAh6eO6DBreKWrZMoL5pxxuEyIy4zonLtCmWA7BErQnHhUHgh680hY NnopKmnFF3fNSswQ8u/gIL/18EhhsyZhi0WRw+V2zRe0SLskfGIH97cn2HQ7x4Cm6t mw/p06fNb/0PPolW8EKM/rHtzrLAKKh4Wm3qQdEYPCLjlF4D3zqACVSOuIFGPURaMF cEaRVB8NakHysFUQlYAfJLU3E4fkxYMaX/HgLlUwpI2UhM2gctBtNPyGwr2heWuIaF 9SCnib1bKJVD6/6YugOdHg1HUYi0OsAsu8HhMqNqEu1aOfZUCZV1W+nKw8swO2+YZE lkhYpyf3x80MA== To: Yingjie Wang Cc: "linux-scsi@vger.kernel.org" , "Martin K . Petersen" , "James E . J . Bottomley" , Bart Van Assche , Jens Axboe , Yang Xiuwei , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v2 0/2] scsi: bsg: report data copyback failures From: "Martin K. Petersen" In-Reply-To: Message-ID: References: Date: Fri, 30 Oct 2026 21:08:45 -0400 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain Yingjie, > The synchronous and io_uring SCSI BSG completion paths discard the > return value from blk_rq_unmap_user(). For data-in commands that use a > bounce buffer, unmapping copies the completed data back to userspace. > A failure during that copyback is then lost, so SG_IO can return > success and io_uring can post a CQE with res == 0 despite the copyback > failure. Applied to 7.4/scsi-staging, thanks! -- Martin K. Petersen