提交 cbc5abaa 编写于 作者: B Bill Kuzeja 提交者: Greg Kroah-Hartman

xhci: Prevent deadlock when xhci adapter breaks during init

commit 8de66b0e6a56ff10dd00d2b0f2ae52e300178587 upstream.

The system can hit a deadlock if an xhci adapter breaks while initializing.
The deadlock is between two threads: thread 1 is tearing down the
adapter and is stuck in usb_unlocked_disable_lpm waiting to lock the
hcd->handwidth_mutex. Thread 2 is holding this mutex (while still trying
to add a usb device), but is stuck in xhci_endpoint_reset waiting for a
stop or config command to complete. A reboot is required to resolve.

It turns out when calling xhci_queue_stop_endpoint and
xhci_queue_configure_endpoint in xhci_endpoint_reset, the return code is
not checked for errors. If the timing is right and the adapter dies just
before either of these commands get issued, we hang indefinitely waiting
for a completion on a command that didn't get issued.

This wasn't a problem before the following fix because we didn't send
commands in xhci_endpoint_reset:

commit f5249461 ("xhci: Clear the host side toggle manually when
    endpoint is soft reset")

With the patch I am submitting, a duration test which breaks adapters
during initialization (and which deadlocks with the standard kernel) runs
without issue.

Fixes: f5249461 ("xhci: Clear the host side toggle manually when endpoint is soft reset")
Cc: <stable@vger.kernel.org> # v4.17+
Cc: Torez Smith <torez@redhat.com>
Signed-off-by: NBill Kuzeja <william.kuzeja@stratus.com>
Signed-off-by: NTorez Smith <torez@redhat.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1570190373-30684-7-git-send-email-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 fde058a1
......@@ -3065,6 +3065,7 @@ static void xhci_endpoint_reset(struct usb_hcd *hcd,
unsigned int ep_index;
unsigned long flags;
u32 ep_flag;
int err;
xhci = hcd_to_xhci(hcd);
if (!host_ep->hcpriv)
......@@ -3114,7 +3115,17 @@ static void xhci_endpoint_reset(struct usb_hcd *hcd,
xhci_free_command(xhci, cfg_cmd);
goto cleanup;
}
xhci_queue_stop_endpoint(xhci, stop_cmd, udev->slot_id, ep_index, 0);
err = xhci_queue_stop_endpoint(xhci, stop_cmd, udev->slot_id,
ep_index, 0);
if (err < 0) {
spin_unlock_irqrestore(&xhci->lock, flags);
xhci_free_command(xhci, cfg_cmd);
xhci_dbg(xhci, "%s: Failed to queue stop ep command, %d ",
__func__, err);
goto cleanup;
}
xhci_ring_cmd_db(xhci);
spin_unlock_irqrestore(&xhci->lock, flags);
......@@ -3128,8 +3139,16 @@ static void xhci_endpoint_reset(struct usb_hcd *hcd,
ctrl_ctx, ep_flag, ep_flag);
xhci_endpoint_copy(xhci, cfg_cmd->in_ctx, vdev->out_ctx, ep_index);
xhci_queue_configure_endpoint(xhci, cfg_cmd, cfg_cmd->in_ctx->dma,
err = xhci_queue_configure_endpoint(xhci, cfg_cmd, cfg_cmd->in_ctx->dma,
udev->slot_id, false);
if (err < 0) {
spin_unlock_irqrestore(&xhci->lock, flags);
xhci_free_command(xhci, cfg_cmd);
xhci_dbg(xhci, "%s: Failed to queue config ep command, %d ",
__func__, err);
goto cleanup;
}
xhci_ring_cmd_db(xhci);
spin_unlock_irqrestore(&xhci->lock, flags);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册