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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 <Markus.Pietrek@emtrion.de>
Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Yoshihiro Shimoda 2010-03-16 12:29:35 +09:00 committed by Greg Kroah-Hartman
parent 9ce669a892
commit d835933436
1 changed files with 11 additions and 5 deletions
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16
drivers/usb/host/r8a66597-hcd.c
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@ -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));