From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 29A2C30DD1B for ; Fri, 11 Sep 2026 01:13:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789089200; cv=none; b=bUr53TOpKi4+7HRwS2ADhAujMCzZxc+R781I7r+jyEt8XICghWnMBmmTm5miTB/eEs2sCf0pXQglXyBBYyAXyFENHYV1kTSFXEgjjEr/0rMvFMUHZHwWBKS9V2lo7GMt1eQJczoC69TgpTR57px+xhuOkSEz3MC3N7sqOYLIgcc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789089200; c=relaxed/simple; bh=qUGlc6Zx2DY79foGMdFOB4kykbR8dlfPhuZbolzITKI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RuFN5ySqwCF4xtiNFhAMghWoRnhQJCVUoFoG4YVrtH+OAuiGCUUDuVchrjnZIkYSfH184cXJSX6KdeEEiycD5CSNDrtrL/sJGhssRgFshMBqYpiqkCPLyds1RguysP1HacMoMLu3xjGlDz5Z+RzK5wMKhmP/lAQQ330FthZBp/c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hcya39GM; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hcya39GM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 303AB1F00893; Fri, 11 Sep 2026 01:13:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789089195; bh=ZdRHE7huHV3dNkHkpVe8xYBDrDrLS+5Dmtctit27fhE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hcya39GMrFt42h+Mjx1XuwXCVCMjxIQW6z//gUW5zXoK4FMLwmAGDHh0TXOqm8o55 Ih/W9IgugTW9knE8LRzmEDcZnYyWV0TVk6y4r5NTReGFGZQ6Iv417KWTKTkPnbhBUL JR8Nzi5sUdEtDdbexqA0vlUMPwqHqOlc6RZmPjYVhc1Ir3sGG7vPMZl9H8uneyQIDb SwM5qLp5Gzdw/hGwe6o8Ozr3s7cJtecMwsYPtalw8A38E6I23sO4OAu/qtVTwErT4l kyta80JjU5ImzvD0HD7jdpnWXl/zp1h5fJYrzYb6jyLvhuP1BAMJwoR3sFFmWt8Ghg JMxm8SBu2/Xcg== From: Sasha Levin To: stable@vger.kernel.org Cc: Li Chen , Pankaj Gupta , "Michael S. Tsirkin" , Sasha Levin Subject: [PATCH 6.12.y 1/6] nvdimm: preserve flush callback -ENOMEM Date: Thu, 10 Sep 2026 21:13:08 -0400 Message-ID: <20260911011313.4034971-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090939-defiance-yelling-974c@gregkh> References: <2026090939-defiance-yelling-974c@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Li Chen [ Upstream commit 6b7108712a4b1c37cac69815aede1dde202b3187 ] nvdimm_flush() maps provider flush failures to -EIO. Keep that default because provider callbacks can report host-side or backend failures that should remain generic I/O errors to the guest. Guest-side allocation failures should not be reported as I/O errors. In the virtio-pmem path, the flush request allocation can fail with -ENOMEM before any request is submitted to the host. Mapping that to -EIO makes resource pressure look like media failure. Preserve -ENOMEM from provider callbacks and continue to map other non-zero provider failures to -EIO. The generic flush path still returns 0, and pmem_submit_bio() already converts errno values to block status for bio completion. Suggested-by: Pankaj Gupta Signed-off-by: Li Chen Signed-off-by: Michael S. Tsirkin Message-ID: <20260630092338.2094628-2-me@linux.beauty> Stable-dep-of: e57140944b5a ("nvdimm: virtio_pmem: refcount requests for token lifetime") Signed-off-by: Sasha Levin --- drivers/nvdimm/region_devs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 849c131f39c75..4e24dccb2ff86 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1112,7 +1112,8 @@ int nvdimm_flush(struct nd_region *nd_region, struct bio *bio) if (!nd_region->flush) rc = generic_nvdimm_flush(nd_region); else { - if (nd_region->flush(nd_region, bio)) + rc = nd_region->flush(nd_region, bio); + if (rc && rc != -ENOMEM) rc = -EIO; } -- 2.53.0