From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>,
Krzysztof Adamski <krzysztof.adamski@nokia.com>,
Wolfram Sang <wsa@the-dreams.de>, Sasha Levin <sashal@kernel.org>,
linux-i2c@vger.kernel.org
Subject: [PATCH AUTOSEL 5.2 39/44] i2c: emev2: avoid race when unregistering slave client
Date: Tue, 20 Aug 2019 09:40:23 -0400 [thread overview]
Message-ID: <20190820134028.10829-39-sashal@kernel.org> (raw)
In-Reply-To: <20190820134028.10829-1-sashal@kernel.org>
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
[ Upstream commit d7437fc0d8291181debe032671a289b6bd93f46f ]
After we disabled interrupts, there might still be an active one
running. Sync before clearing the pointer to the slave device.
Fixes: c31d0a00021d ("i2c: emev2: add slave support")
Reported-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/i2c/busses/i2c-emev2.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/busses/i2c-emev2.c b/drivers/i2c/busses/i2c-emev2.c
index 35b302d983e0d..959d4912ec0d5 100644
--- a/drivers/i2c/busses/i2c-emev2.c
+++ b/drivers/i2c/busses/i2c-emev2.c
@@ -69,6 +69,7 @@ struct em_i2c_device {
struct completion msg_done;
struct clk *sclk;
struct i2c_client *slave;
+ int irq;
};
static inline void em_clear_set_bit(struct em_i2c_device *priv, u8 clear, u8 set, u8 reg)
@@ -339,6 +340,12 @@ static int em_i2c_unreg_slave(struct i2c_client *slave)
writeb(0, priv->base + I2C_OFS_SVA0);
+ /*
+ * Wait for interrupt to finish. New slave irqs cannot happen because we
+ * cleared the slave address and, thus, only extension codes will be
+ * detected which do not use the slave ptr.
+ */
+ synchronize_irq(priv->irq);
priv->slave = NULL;
return 0;
@@ -355,7 +362,7 @@ static int em_i2c_probe(struct platform_device *pdev)
{
struct em_i2c_device *priv;
struct resource *r;
- int irq, ret;
+ int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -390,8 +397,8 @@ static int em_i2c_probe(struct platform_device *pdev)
em_i2c_reset(&priv->adap);
- irq = platform_get_irq(pdev, 0);
- ret = devm_request_irq(&pdev->dev, irq, em_i2c_irq_handler, 0,
+ priv->irq = platform_get_irq(pdev, 0);
+ ret = devm_request_irq(&pdev->dev, priv->irq, em_i2c_irq_handler, 0,
"em_i2c", priv);
if (ret)
goto err_clk;
@@ -401,7 +408,8 @@ static int em_i2c_probe(struct platform_device *pdev)
if (ret)
goto err_clk;
- dev_info(&pdev->dev, "Added i2c controller %d, irq %d\n", priv->adap.nr, irq);
+ dev_info(&pdev->dev, "Added i2c controller %d, irq %d\n", priv->adap.nr,
+ priv->irq);
return 0;
--
2.20.1
next prev parent reply other threads:[~2019-08-20 13:42 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-20 13:39 [PATCH AUTOSEL 5.2 01/44] dmaengine: ste_dma40: fix unneeded variable warning Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 02/44] nvme-multipath: revalidate nvme_ns_head gendisk in nvme_validate_ns Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 03/44] afs: Fix the CB.ProbeUuid service handler to reply correctly Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 04/44] afs: Fix loop index mixup in afs_deliver_vl_get_entry_by_name_u() Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 05/44] fs: afs: Fix a possible null-pointer dereference in afs_put_read() Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 06/44] afs: Fix off-by-one in afs_rename() expected data version calculation Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 07/44] afs: Only update d_fsdata if different in afs_d_revalidate() Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 08/44] afs: Fix missing dentry data version updating Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 09/44] intel_th: Use the correct style for SPDX License Identifier Sasha Levin
2019-08-20 14:27 ` Greg Kroah-Hartman
2019-08-20 20:03 ` Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 10/44] nvmet: Fix use-after-free bug when a port is removed Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 11/44] nvmet-loop: Flush nvme_delete_wq when removing the port Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 12/44] nvmet-file: fix nvmet_file_flush() always returning an error Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 13/44] nvme-core: Fix extra device_put() call on error path Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 14/44] nvme: fix a possible deadlock when passthru commands sent to a multipath device Sasha Levin
2019-08-20 13:39 ` [PATCH AUTOSEL 5.2 15/44] nvme-rdma: fix possible use-after-free in connect error flow Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 16/44] nvme: fix controller removal race with scan work Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 17/44] nvme-pci: Fix async probe remove race Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 18/44] soundwire: cadence_master: fix register definition for SLAVE_STATE Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 19/44] soundwire: cadence_master: fix definitions for INTSTAT0/1 Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 20/44] iio: adc: max9611: Fix temperature reading in probe Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 21/44] auxdisplay: panel: need to delete scan_timer when misc_register fails in panel_attach Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 22/44] btrfs: trim: Check the range passed into to prevent overflow Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 23/44] IB/mlx5: Fix implicit MR release flow Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 24/44] dmaengine: stm32-mdma: Fix a possible null-pointer dereference in stm32_mdma_irq_handler() Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 25/44] omap-dma/omap_vout_vrfb: fix off-by-one fi value Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 26/44] iommu/dma: Handle SG length overflow better Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 27/44] dma-direct: don't truncate dma_required_mask to bus addressing capabilities Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 28/44] usb: gadget: composite: Clear "suspended" on reset/disconnect Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 29/44] usb: gadget: mass_storage: Fix races between fsg_disable and fsg_set_alt Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 30/44] habanalabs: fix DRAM usage accounting on context tear down Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 31/44] habanalabs: fix endianness handling for packets from user Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 32/44] habanalabs: fix completion queue handling when host is BE Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 33/44] habanalabs: fix endianness handling for internal QMAN submission Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 34/44] habanalabs: fix device IRQ unmasking for BE host Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 35/44] xen/blkback: fix memory leaks Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 36/44] arm64: cpufeature: Don't treat granule sizes as strict Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 37/44] riscv: fix flush_tlb_range() end address for flush_tlb_page() Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 38/44] i2c: rcar: avoid race when unregistering slave client Sasha Levin
2019-08-20 13:40 ` Sasha Levin [this message]
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 40/44] drm/scheduler: use job count instead of peek Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 41/44] drm/ast: Fixed reboot test may cause system hanged Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 42/44] usb: host: fotg2: restart hcd after port reset Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 43/44] tools: hv: fixed Python pep8/flake8 warnings for lsvmbus Sasha Levin
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 44/44] tools: hv: fix KVP and VSS daemons exit code Sasha Levin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190820134028.10829-39-sashal@kernel.org \
--to=sashal@kernel.org \
--cc=krzysztof.adamski@nokia.com \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=stable@vger.kernel.org \
--cc=wsa+renesas@sang-engineering.com \
--cc=wsa@the-dreams.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).