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 443E41E7C2E for ; Fri, 11 Sep 2026 00:34:12 +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=1789086855; cv=none; b=ZrFAEjnd57J2vyv3kqbzpL0v1LlgHZbHmsII50C1dh2ERwEs0uNQ3rAyvE9eUApGfK+ciN+trnF6BDdPv4AcJ4RFOpOPk8YwSK/MQ7/Z9YojIwFLF5V0A7Xg/TDQ8bh++qYflCOwRfClpYwr3pxcz6znLPkG4CuIl4IfDcLZNTo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789086855; c=relaxed/simple; bh=8E8P/BfbS2MOGetdTsbO8MwBvfWyXA5b7Jz5SjqNPMA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dQ13ftYLEuZDXAJwRXAjQrHhb6+YI9GXT2m3szegt70c0quonEh9dhkDA76YTPycLXdLvLTIqGAxVEGFvm0XarI5tboMtcFqjJ5+Pvf5Ne8j2AMNC1MCHJ4TnQAUCdWep6KD+O7KrERetQn2b5rUSBx9GGlL+Zq4fkbwyHzXUKc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=g0+aY9t9; 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="g0+aY9t9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7C381F00893; Fri, 11 Sep 2026 00:34:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789086852; bh=REXKWILcRDKu9T4bijhcCh5T0JID/fPFroWzWrvLlsY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=g0+aY9t9W7EE/84TG/75h5clpGf3+/YX/UDDjAgNRpxd5/BMLXo3n2R3Pk13iYfRT xAJkyUcfTXqBpC+IdzINCKNpTOPUrT8AfFbUolGvRhd4gqsjfClEUdPdiRJMA5Ht3L REIl6ucvbA1Ys/85CVJKrAJlnUR/lKs+cJOad+UwFX44flzXM7x8yn7X8ptIel9qaS vjcZc5B2QFFN5KORC1ND+BMxQIucCY/TVcxq4MKPG9ooVx/8vjqHf+auLNXAmmntB0 bHcxqUqfWlRwJtzSI7kqx4mYMnaXrPdgggV/RIcnrVLI1uTc5FGNQou3UlGS65veuB suZY1oET6CsFg== From: Sasha Levin To: stable@vger.kernel.org Cc: Li Chen , Pankaj Gupta , "Michael S. Tsirkin" , Sasha Levin Subject: [PATCH 6.18.y 1/6] nvdimm: preserve flush callback -ENOMEM Date: Thu, 10 Sep 2026 20:34:05 -0400 Message-ID: <20260911003410.3483414-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090938-reliance-nearly-8ed8@gregkh> References: <2026090938-reliance-nearly-8ed8@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 5a1c68c701cfc..92d835c8dd168 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1094,7 +1094,8 @@ 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