diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2013-01-22 11:37:35 -0500 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-02-06 04:33:41 +0000 |
| commit | a928a96a8bd2137731ab48c241db935dbd30ace6 (patch) | |
| tree | 92258a1a275dcbb920da7041c930f1808c55eaed /drivers/usb/host | |
| parent | 0988130fc498f91dd9f730bde92006048a0f347c (diff) | |
USB: UHCI: fix IRQ race during initialization
commit 0f815a0a700bc10547449bde6c106051a035a1b9 upstream.
This patch (as1644) fixes a race that occurs during startup in
uhci-hcd. If the IRQ line is shared with other devices, it's possible
for the handler routine to be called before the data structures are
fully initialized.
The problem is fixed by adding a check to the IRQ handler routine. If
the initialization hasn't finished yet, the routine will return
immediately.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Don Zickus <dzickus@redhat.com>
Tested-by: "Huang, Adrian (ISS Linux TW)" <adrian.huang@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/uhci-hcd.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c index c8ae199cfbb..b6989e41061 100644 --- a/drivers/usb/host/uhci-hcd.c +++ b/drivers/usb/host/uhci-hcd.c @@ -448,6 +448,10 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd) return IRQ_NONE; uhci_writew(uhci, status, USBSTS); /* Clear it */ + spin_lock(&uhci->lock); + if (unlikely(!uhci->is_initialized)) /* not yet configured */ + goto done; + if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) { if (status & USBSTS_HSE) dev_err(uhci_dev(uhci), "host system error, " @@ -456,7 +460,6 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd) dev_err(uhci_dev(uhci), "host controller process " "error, something bad happened!\n"); if (status & USBSTS_HCH) { - spin_lock(&uhci->lock); if (uhci->rh_state >= UHCI_RH_RUNNING) { dev_err(uhci_dev(uhci), "host controller halted, " @@ -474,15 +477,15 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd) * pending unlinks */ mod_timer(&hcd->rh_timer, jiffies); } - spin_unlock(&uhci->lock); } } - if (status & USBSTS_RD) + if (status & USBSTS_RD) { + spin_unlock(&uhci->lock); usb_hcd_poll_rh_status(hcd); - else { - spin_lock(&uhci->lock); + } else { uhci_scan_schedule(uhci); + done: spin_unlock(&uhci->lock); } @@ -660,9 +663,9 @@ static int uhci_start(struct usb_hcd *hcd) */ mb(); + spin_lock_irq(&uhci->lock); configure_hc(uhci); uhci->is_initialized = 1; - spin_lock_irq(&uhci->lock); start_rh(uhci); spin_unlock_irq(&uhci->lock); return 0; |