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authorThinh Nguyen <Thinh.Nguyen@synopsys.com>2021-01-14 11:09:51 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-01-15 19:15:04 +0300
commitc28095bc99073ddda65e4f31f6ae0d908d4d5cd8 (patch)
tree19564cea8f8e210a535123fa6318cb0cff073d08 /drivers/usb/gadget/udc
parent6e6aa61d81194c01283880950df563b1b9abec46 (diff)
downloadlinux-c28095bc99073ddda65e4f31f6ae0d908d4d5cd8.tar.xz
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>
Diffstat (limited to 'drivers/usb/gadget/udc')
-rw-r--r--drivers/usb/gadget/udc/core.c13
1 files changed, 10 insertions, 3 deletions
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);