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 3D59225776 for ; Fri, 11 Sep 2026 10:41:42 +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=1789123304; cv=none; b=tCjjUOKJvg71w6d0AhtBF1Egk+g6QqVlcr14juqLns5WNALxfVsSzpJZiVQoXcYLTrY3sdiNeteUawEkQ8++A757A9b7F0RCMo7PC5AFKI5DIwBLzQ7D0M5Y6Qg/9U5oJl5jBDQfvPTtuIJEG4XcUlqOTi6jS8q89g3PMGMhrCg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789123304; c=relaxed/simple; bh=GoX0obQHqyhE4RFqV104QJX0902CfMUoEk4l5gV5M1A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uThMhY3ZwLVzGlz1FYYQ4qmAgM4tQ2j/l1b3fujrCFJQ1RoCte5GAP2Wzy2MNJic/mWGKk2tILSFariLQ1EiP8Bgzt4IHZ3+kc2wchlgrDXqSUqMr6jxOn2eEmXprExB+XIX+nR9v+v+QH6xdfiz7NBHUoLNg9+jN39eZ92QRcE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WI5ICARp; 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="WI5ICARp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3410C1F0089A; Fri, 11 Sep 2026 10:41:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789123302; bh=z8EPKrB1m3fAVYKUVb7deMOewxholWkdojucML4tDGs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=WI5ICARplEyQ9J7qd8XBwzZsmMArtmt+VXP2caxb0D/1ZZm3lUdbhY7gPX6mF6lys jdsLFH5YEsFr+LWHxbgZl+hlTiw/FkItUVGivu+3TyJvdOkKTQKkpzC1ZObatpHGkv zgT/aWcgu6BBnbzidhiAmENPZFIDm5jPslZcP4uxY+a+8BAVSyA5gbNTTOpGBmdNIU kNm9AI2V3ekQ2PbegzguKAXD3UOrptVwGR4zO0gB1F8QIY7/EiyPUssR6ZHCAuFl3b ZE1osBl/YqQWR2E65hdEpC3cUujrc0g9E2BqVlLE9kHsmwh98oopaFgDbInMjnqJ3F Jq2NjRVNqiapQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Li Chen , Pankaj Gupta , "Michael S. Tsirkin" , Sasha Levin Subject: [PATCH 6.1.y 1/4] nvdimm: preserve flush callback -ENOMEM Date: Fri, 11 Sep 2026 06:41:37 -0400 Message-ID: <20260911104140.195754-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090940-grappling-configure-44a7@gregkh> References: <2026090940-grappling-configure-44a7@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 bc01a0da168d2..8553d9322175e 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1065,7 +1065,8 @@ 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