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 38/44] i2c: rcar: avoid race when unregistering slave client
Date: Tue, 20 Aug 2019 09:40:22 -0400 [thread overview]
Message-ID: <20190820134028.10829-38-sashal@kernel.org> (raw)
In-Reply-To: <20190820134028.10829-1-sashal@kernel.org>
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
[ Upstream commit 7b814d852af6944657c2961039f404c4490771c0 ]
After we disabled interrupts, there might still be an active one
running. Sync before clearing the pointer to the slave device.
Fixes: de20d1857dd6 ("i2c: rcar: 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-rcar.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index d39a4606f72d3..531c01100b560 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -139,6 +139,7 @@ struct rcar_i2c_priv {
enum dma_data_direction dma_direction;
struct reset_control *rstc;
+ int irq;
};
#define rcar_i2c_priv_to_dev(p) ((p)->adap.dev.parent)
@@ -861,9 +862,11 @@ static int rcar_unreg_slave(struct i2c_client *slave)
WARN_ON(!priv->slave);
+ /* disable irqs and ensure none is running before clearing ptr */
rcar_i2c_write(priv, ICSIER, 0);
rcar_i2c_write(priv, ICSCR, 0);
+ synchronize_irq(priv->irq);
priv->slave = NULL;
pm_runtime_put(rcar_i2c_priv_to_dev(priv));
@@ -918,7 +921,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
struct i2c_adapter *adap;
struct device *dev = &pdev->dev;
struct i2c_timings i2c_t;
- int irq, ret;
+ int ret;
/* Otherwise logic will break because some bytes must always use PIO */
BUILD_BUG_ON_MSG(RCAR_MIN_DMA_LEN < 3, "Invalid min DMA length");
@@ -984,10 +987,10 @@ static int rcar_i2c_probe(struct platform_device *pdev)
pm_runtime_put(dev);
- irq = platform_get_irq(pdev, 0);
- ret = devm_request_irq(dev, irq, rcar_i2c_irq, 0, dev_name(dev), priv);
+ priv->irq = platform_get_irq(pdev, 0);
+ ret = devm_request_irq(dev, priv->irq, rcar_i2c_irq, 0, dev_name(dev), priv);
if (ret < 0) {
- dev_err(dev, "cannot get irq %d\n", irq);
+ dev_err(dev, "cannot get irq %d\n", priv->irq);
goto out_pm_disable;
}
--
2.20.1
next prev parent reply other threads:[~2019-08-20 13:46 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 ` Sasha Levin [this message]
2019-08-20 13:40 ` [PATCH AUTOSEL 5.2 39/44] i2c: emev2: avoid race when unregistering slave client Sasha Levin
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=20190820134028.10829-38-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).