From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Dongli Zhang <dongli.zhang@oracle.com>,
Julien Grall <jgrall@amazon.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Sasha Levin <sashal@kernel.org>,
xen-devel@lists.xenproject.org
Subject: [PATCH AUTOSEL 5.5 37/41] xenbus: req->err should be updated before req->state
Date: Sun, 15 Mar 2020 22:33:15 -0400 [thread overview]
Message-ID: <20200316023319.749-37-sashal@kernel.org> (raw)
In-Reply-To: <20200316023319.749-1-sashal@kernel.org>
From: Dongli Zhang <dongli.zhang@oracle.com>
[ Upstream commit 8130b9d5b5abf26f9927b487c15319a187775f34 ]
This patch adds the barrier to guarantee that req->err is always updated
before req->state.
Otherwise, read_reply() would not return ERR_PTR(req->err) but
req->body, when process_writes()->xb_write() is failed.
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Link: https://lore.kernel.org/r/20200303221423.21962-2-dongli.zhang@oracle.com
Reviewed-by: Julien Grall <jgrall@amazon.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/xen/xenbus/xenbus_comms.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/xen/xenbus/xenbus_comms.c b/drivers/xen/xenbus/xenbus_comms.c
index 852ed161fc2a7..eb5151fc8efab 100644
--- a/drivers/xen/xenbus/xenbus_comms.c
+++ b/drivers/xen/xenbus/xenbus_comms.c
@@ -397,6 +397,8 @@ static int process_writes(void)
if (state.req->state == xb_req_state_aborted)
kfree(state.req);
else {
+ /* write err, then update state */
+ virt_wmb();
state.req->state = xb_req_state_got_reply;
wake_up(&state.req->wq);
}
--
2.20.1
next prev parent reply other threads:[~2020-03-16 2:40 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-16 2:32 [PATCH AUTOSEL 5.5 01/41] spi: spi-omap2-mcspi: Handle DMA size restriction on AM65x Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 02/41] spi: spi-omap2-mcspi: Support probe deferral for DMA channels Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 03/41] drm/mediatek: Find the cursor plane instead of hard coding it Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 04/41] drm/mediatek: Ensure the cursor plane is on top of other overlays Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 05/41] ARM: dts: imx6dl-colibri-eval-v3: fix sram compatible properties Sasha Levin
2020-03-16 7:21 ` Johan Hovold
2020-03-22 12:54 ` Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 06/41] phy: ti: gmii-sel: fix set of copy-paste errors Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 07/41] phy: ti: gmii-sel: do not fail in case of gmii Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 08/41] ARM: dts: dra7-l4: mark timer13-16 as pwm capable Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 09/41] ASoC: meson: g12a: add tohdmitx reset Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 10/41] spi: qup: call spi_qup_pm_resume_runtime before suspending Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 11/41] powerpc: Include .BTF section Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 12/41] cifs: fix potential mismatch of UNC paths Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 13/41] cifs: add missing mount option to /proc/mounts Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 14/41] ARM: dts: dra7: Add "dma-ranges" property to PCIe RC DT nodes Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 15/41] spi: pxa2xx: Add CS control clock quirk Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 16/41] spi/zynqmp: remove entry that causes a cs glitch Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 17/41] ARM: dts: bcm283x: Add missing properties to the PWR LED Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 18/41] drm/exynos: dsi: propagate error value and silence meaningless warning Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 19/41] drm/exynos: dsi: fix workaround for the legacy clock name Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 20/41] drm/exynos: hdmi: don't leak enable HDMI_EN regulator if probe fails Sasha Levin
2020-03-16 2:32 ` [PATCH AUTOSEL 5.5 21/41] drivers/perf: fsl_imx8_ddr: Correct the CLEAR bit definition Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 22/41] drivers/perf: arm_pmu_acpi: Fix incorrect checking of gicc pointer Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 23/41] io-wq: fix IO_WQ_WORK_NO_CANCEL cancellation Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 24/41] ARM: bcm2835_defconfig: Explicitly restore CONFIG_DEBUG_FS Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 25/41] altera-stapl: altera_get_note: prevent write beyond end of 'key' Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 26/41] dm bio record: save/restore bi_end_io and bi_integrity Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 27/41] dm integrity: use dm_bio_record and dm_bio_restore Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 28/41] riscv: avoid the PIC offset of static percpu data in module beyond 2G limits Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 29/41] ASoC: stm32: sai: manage rebind issue Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 30/41] spi: spi_register_controller(): free bus id on error paths Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 31/41] riscv: Force flat memory model with no-mmu Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 32/41] riscv: Fix range looking for kernel image memblock Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 33/41] drm/amdgpu: clean wptr on wb when gpu recovery Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 34/41] drm/amd/display: Clear link settings on MST disable connector Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 35/41] drm/amd/display: fix dcc swath size calculations on dcn1 Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 36/41] xenbus: req->body should be updated before req->state Sasha Levin
2020-03-16 2:33 ` Sasha Levin [this message]
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 38/41] riscv: fix seccomp reject syscall code path Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 39/41] block, bfq: fix overwrite of bfq_group pointer in bfq_find_set_group() Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 40/41] parse-maintainers: Mark as executable Sasha Levin
2020-03-16 2:33 ` [PATCH AUTOSEL 5.5 41/41] io_uring: fix lockup with timeouts Sasha Levin
2020-03-16 11:50 ` [PATCH AUTOSEL 5.5 01/41] spi: spi-omap2-mcspi: Handle DMA size restriction on AM65x Mark Brown
2020-03-22 19:37 ` Sasha Levin
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