From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>
Cc: Stuart Yoder <stuyoder@gmail.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Vineeth Vijayan <vneethv@linux.ibm.com>,
Peter Oberparleiter <oberpar@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Andy Gross <agross@kernel.org>,
linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
NXP Linux Team <linux-imx@nxp.com>,
linux-arm-kernel@lists.infradead.org,
linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org,
linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org,
linux-spi@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
Michael Kelley <mikelley@microsoft.com>
Subject: [PATCH v7 04/12] hv: Use driver_set_override() instead of open-coding
Date: Tue, 19 Apr 2022 13:34:27 +0200 [thread overview]
Message-ID: <20220419113435.246203-5-krzysztof.kozlowski@linaro.org> (raw)
In-Reply-To: <20220419113435.246203-1-krzysztof.kozlowski@linaro.org>
Use a helper to set driver_override to the reduce amount of duplicated
code. Make the driver_override field const char, because it is not
modified by the core and it matches other subsystems.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
---
drivers/hv/vmbus_drv.c | 28 ++++------------------------
include/linux/hyperv.h | 6 +++++-
2 files changed, 9 insertions(+), 25 deletions(-)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 14de17087864..607e40aba18e 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -575,31 +575,11 @@ static ssize_t driver_override_store(struct device *dev,
const char *buf, size_t count)
{
struct hv_device *hv_dev = device_to_hv_device(dev);
- char *driver_override, *old, *cp;
-
- /* We need to keep extra room for a newline */
- if (count >= (PAGE_SIZE - 1))
- return -EINVAL;
-
- driver_override = kstrndup(buf, count, GFP_KERNEL);
- if (!driver_override)
- return -ENOMEM;
-
- cp = strchr(driver_override, '\n');
- if (cp)
- *cp = '\0';
-
- device_lock(dev);
- old = hv_dev->driver_override;
- if (strlen(driver_override)) {
- hv_dev->driver_override = driver_override;
- } else {
- kfree(driver_override);
- hv_dev->driver_override = NULL;
- }
- device_unlock(dev);
+ int ret;
- kfree(old);
+ ret = driver_set_override(dev, &hv_dev->driver_override, buf, count);
+ if (ret)
+ return ret;
return count;
}
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index fe2e0179ed51..12e2336b23b7 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1257,7 +1257,11 @@ struct hv_device {
u16 device_id;
struct device device;
- char *driver_override; /* Driver name to force a match */
+ /*
+ * Driver name to force a match. Do not set directly, because core
+ * frees it. Use driver_set_override() to set or clear it.
+ */
+ const char *driver_override;
struct vmbus_channel *channel;
struct kset *channels_kset;
--
2.32.0
next prev parent reply other threads:[~2022-04-19 11:35 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-19 11:34 [PATCH v7 00/12] Fix broken usage of driver_override (and kfree of static memory) Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 01/12] driver: platform: Add helper for safer setting of driver_override Krzysztof Kozlowski
2022-04-20 17:12 ` Rafael J. Wysocki
2022-04-19 11:34 ` [PATCH v7 02/12] amba: Use driver_set_override() instead of open-coding Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 03/12] fsl-mc: " Krzysztof Kozlowski
2022-04-19 11:34 ` Krzysztof Kozlowski [this message]
2022-04-19 11:34 ` [PATCH v7 05/12] PCI: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 06/12] s390/cio: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 07/12] spi: Use helper for safer setting of driver_override Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 08/12] vdpa: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 09/12] clk: imx: scu: Fix kfree() of static memory on setting driver_override Krzysztof Kozlowski
2022-04-23 16:09 ` Abel Vesa
2022-04-19 11:34 ` [PATCH v7 10/12] slimbus: qcom-ngd: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 11/12] rpmsg: Constify local variable in field store macro Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 12/12] rpmsg: Fix kfree() of static memory on setting driver_override Krzysztof Kozlowski
[not found] ` <CGME20220429122942eucas1p1820d0cd17a871d4953bac2b3de1dcdd9@eucas1p1.samsung.com>
2022-04-29 12:29 ` Marek Szyprowski
2022-04-29 14:16 ` Krzysztof Kozlowski
2022-04-29 14:51 ` Marek Szyprowski
2022-04-29 18:29 ` Krzysztof Kozlowski
2022-04-20 9:20 ` [PATCH v7 00/12] Fix broken usage of driver_override (and kfree of static memory) Krzysztof Kozlowski
2022-04-22 14:54 ` Greg Kroah-Hartman
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