From d835933436ac0d1e8f5b35fe809fd4e767e55d6e Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Tue, 16 Mar 2010 12:29:35 +0900 Subject: usb: r8a66597-hcd: fix removed from an attached hub fix the problem that when a USB hub is attached to the r8a66597-hcd and a device is removed from that hub, it's likely that a kernel panic follows. Reported-by: Markus Pietrek Signed-off-by: Yoshihiro Shimoda Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/r8a66597-hcd.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'drivers/usb') diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c index bee558aed427..f71a73a93d0c 100644 --- a/drivers/usb/host/r8a66597-hcd.c +++ b/drivers/usb/host/r8a66597-hcd.c @@ -418,7 +418,7 @@ static u8 alloc_usb_address(struct r8a66597 *r8a66597, struct urb *urb) /* this function must be called with interrupt disabled */ static void free_usb_address(struct r8a66597 *r8a66597, - struct r8a66597_device *dev) + struct r8a66597_device *dev, int reset) { int port; @@ -430,7 +430,13 @@ static void free_usb_address(struct r8a66597 *r8a66597, dev->state = USB_STATE_DEFAULT; r8a66597->address_map &= ~(1 << dev->address); dev->address = 0; - dev_set_drvdata(&dev->udev->dev, NULL); + /* + * Only when resetting USB, it is necessary to erase drvdata. When + * a usb device with usb hub is disconnect, "dev->udev" is already + * freed on usb_desconnect(). So we cannot access the data. + */ + if (reset) + dev_set_drvdata(&dev->udev->dev, NULL); list_del(&dev->device_list); kfree(dev); @@ -1069,7 +1075,7 @@ static void r8a66597_usb_disconnect(struct r8a66597 *r8a66597, int port) struct r8a66597_device *dev = r8a66597->root_hub[port].dev; disable_r8a66597_pipe_all(r8a66597, dev); - free_usb_address(r8a66597, dev); + free_usb_address(r8a66597, dev, 0); start_root_hub_sampling(r8a66597, port, 0); } @@ -2085,7 +2091,7 @@ static void update_usb_address_map(struct r8a66597 *r8a66597, spin_lock_irqsave(&r8a66597->lock, flags); dev = get_r8a66597_device(r8a66597, addr); disable_r8a66597_pipe_all(r8a66597, dev); - free_usb_address(r8a66597, dev); + free_usb_address(r8a66597, dev, 0); put_child_connect_map(r8a66597, addr); spin_unlock_irqrestore(&r8a66597->lock, flags); } @@ -2228,7 +2234,7 @@ static int r8a66597_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, rh->port |= (1 << USB_PORT_FEAT_RESET); disable_r8a66597_pipe_all(r8a66597, dev); - free_usb_address(r8a66597, dev); + free_usb_address(r8a66597, dev, 1); r8a66597_mdfy(r8a66597, USBRST, USBRST | UACT, get_dvstctr_reg(port)); -- cgit v1.2.3-59-g8ed1b