This is a note to let you know that I've just added the patch titled xhci: Do not use GFP_KERNEL in (potentially) atomic context to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: xhci-do-not-use-gfp_kernel-in-potentially-atomic-context.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From dda32c00c9a0fa103b5d54ef72c477b7aa993679 Mon Sep 17 00:00:00 2001 From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> Date: Wed, 12 May 2021 11:08:14 +0300 Subject: xhci: Do not use GFP_KERNEL in (potentially) atomic context From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> commit dda32c00c9a0fa103b5d54ef72c477b7aa993679 upstream. 'xhci_urb_enqueue()' is passed a 'mem_flags' argument, because "URBs may be submitted in interrupt context" (see comment related to 'usb_submit_urb()' in 'drivers/usb/core/urb.c') So this flag should be used in all the calling chain. Up to now, 'xhci_check_maxpacket()' which is only called from 'xhci_urb_enqueue()', uses GFP_KERNEL. Be safe and pass the mem_flags to this function as well. Fixes: ddba5cd0aeff ("xhci: Use command structures when queuing commands on the command ring") Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210512080816.866037-4-mathias.nyman@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1374,7 +1374,7 @@ static int xhci_configure_endpoint(struc * we need to issue an evaluate context command and wait on it. */ static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id, - unsigned int ep_index, struct urb *urb) + unsigned int ep_index, struct urb *urb, gfp_t mem_flags) { struct xhci_container_ctx *out_ctx; struct xhci_input_control_ctx *ctrl_ctx; @@ -1405,7 +1405,7 @@ static int xhci_check_maxpacket(struct x * changes max packet sizes. */ - command = xhci_alloc_command(xhci, true, GFP_KERNEL); + command = xhci_alloc_command(xhci, true, mem_flags); if (!command) return -ENOMEM; @@ -1502,7 +1502,7 @@ static int xhci_urb_enqueue(struct usb_h */ if (urb->dev->speed == USB_SPEED_FULL) { ret = xhci_check_maxpacket(xhci, slot_id, - ep_index, urb); + ep_index, urb, mem_flags); if (ret < 0) { xhci_urb_free_priv(urb_priv); urb->hcpriv = NULL; Patches currently in stable-queue which might be from christophe.jaillet@xxxxxxxxxx are queue-4.19/usb-fotg210-hcd-fix-an-error-message.patch queue-4.19/acpi-scan-fix-a-memory-leak-in-an-error-handling-pat.patch queue-4.19/xhci-do-not-use-gfp_kernel-in-potentially-atomic-context.patch