* FAILED: patch "[PATCH] usb: udc: core: Use lock when write to soft_connect" failed to apply to 4.4-stable tree
@ 2021-01-25 14:19 gregkh
2021-02-04 16:49 ` Sudip Mukherjee
0 siblings, 1 reply; 3+ messages in thread
From: gregkh @ 2021-01-25 14:19 UTC (permalink / raw)
To: Thinh.Nguyen, balbi, gregkh; +Cc: stable
The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c28095bc99073ddda65e4f31f6ae0d908d4d5cd8 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Date: Thu, 14 Jan 2021 00:09:51 -0800
Subject: [PATCH] usb: udc: core: Use lock when write to soft_connect
Use lock to guard against concurrent access for soft-connect/disconnect
operations when writing to soft_connect sysfs.
Fixes: 2ccea03a8f7e ("usb: gadget: introduce UDC Class")
Cc: stable@vger.kernel.org
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/338ea01fbd69b1985ef58f0f59af02c805ddf189.1610611437.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 6a62bbd01324..ea114f922ccf 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1529,10 +1529,13 @@ static ssize_t soft_connect_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
+ ssize_t ret;
+ mutex_lock(&udc_lock);
if (!udc->driver) {
dev_err(dev, "soft-connect without a gadget driver\n");
- return -EOPNOTSUPP;
+ ret = -EOPNOTSUPP;
+ goto out;
}
if (sysfs_streq(buf, "connect")) {
@@ -1543,10 +1546,14 @@ static ssize_t soft_connect_store(struct device *dev,
usb_gadget_udc_stop(udc);
} else {
dev_err(dev, "unsupported command '%s'\n", buf);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
- return n;
+ ret = n;
+out:
+ mutex_unlock(&udc_lock);
+ return ret;
}
static DEVICE_ATTR_WO(soft_connect);
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: FAILED: patch "[PATCH] usb: udc: core: Use lock when write to soft_connect" failed to apply to 4.4-stable tree
2021-01-25 14:19 FAILED: patch "[PATCH] usb: udc: core: Use lock when write to soft_connect" failed to apply to 4.4-stable tree gregkh
@ 2021-02-04 16:49 ` Sudip Mukherjee
2021-02-05 8:56 ` Greg KH
0 siblings, 1 reply; 3+ messages in thread
From: Sudip Mukherjee @ 2021-02-04 16:49 UTC (permalink / raw)
To: gregkh; +Cc: Thinh.Nguyen, balbi, stable
[-- Attachment #1: Type: text/plain, Size: 367 bytes --]
Hi Greg,
On Mon, Jan 25, 2021 at 03:19:51PM +0100, gregkh@linuxfoundation.org wrote:
>
> The patch below does not apply to the 4.4-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
Here is the backport.
--
Regards
Sudip
[-- Attachment #2: 0001-usb-udc-core-Use-lock-when-write-to-soft_connect.patch --]
[-- Type: text/x-diff, Size: 1999 bytes --]
From a2a1a8f2013e91b11f3db55d65b6c1ce3d51bf98 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Date: Thu, 14 Jan 2021 00:09:51 -0800
Subject: [PATCH] usb: udc: core: Use lock when write to soft_connect
commit c28095bc99073ddda65e4f31f6ae0d908d4d5cd8 upstream
Use lock to guard against concurrent access for soft-connect/disconnect
operations when writing to soft_connect sysfs.
Fixes: 2ccea03a8f7e ("usb: gadget: introduce UDC Class")
Cc: stable@vger.kernel.org
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/338ea01fbd69b1985ef58f0f59af02c805ddf189.1610611437.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[sudip: manual backporting to old file]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
---
drivers/usb/gadget/udc/udc-core.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
index a6a1678cb927..c6859fdd74bc 100644
--- a/drivers/usb/gadget/udc/udc-core.c
+++ b/drivers/usb/gadget/udc/udc-core.c
@@ -612,10 +612,13 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
+ ssize_t ret;
+ mutex_lock(&udc_lock);
if (!udc->driver) {
dev_err(dev, "soft-connect without a gadget driver\n");
- return -EOPNOTSUPP;
+ ret = -EOPNOTSUPP;
+ goto out;
}
if (sysfs_streq(buf, "connect")) {
@@ -627,10 +630,14 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
usb_gadget_udc_stop(udc);
} else {
dev_err(dev, "unsupported command '%s'\n", buf);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
- return n;
+ ret = n;
+out:
+ mutex_unlock(&udc_lock);
+ return ret;
}
static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
--
2.29.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: FAILED: patch "[PATCH] usb: udc: core: Use lock when write to soft_connect" failed to apply to 4.4-stable tree
2021-02-04 16:49 ` Sudip Mukherjee
@ 2021-02-05 8:56 ` Greg KH
0 siblings, 0 replies; 3+ messages in thread
From: Greg KH @ 2021-02-05 8:56 UTC (permalink / raw)
To: Sudip Mukherjee; +Cc: Thinh.Nguyen, balbi, stable
On Thu, Feb 04, 2021 at 04:49:52PM +0000, Sudip Mukherjee wrote:
> Hi Greg,
>
> On Mon, Jan 25, 2021 at 03:19:51PM +0100, gregkh@linuxfoundation.org wrote:
> >
> > The patch below does not apply to the 4.4-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
>
> Here is the backport.
Applied, thanks.
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-02-05 8:57 UTC | newest]
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2021-01-25 14:19 FAILED: patch "[PATCH] usb: udc: core: Use lock when write to soft_connect" failed to apply to 4.4-stable tree gregkh
2021-02-04 16:49 ` Sudip Mukherjee
2021-02-05 8:56 ` Greg KH
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