Commit 85d07c556216 ("USB: core: Unite old scheme and new scheme
descriptor reads") altered the way USB devices are enumerated
following detection, and in the process it messed up the
initialization of SuperSpeed (or faster) devices:
[ 31.650759] usb 2-1: new SuperSpeed Plus Gen 2x1 USB device number 2 using xhci_hcd
[ 31.663107] usb 2-1: device descriptor read/8, error -71
[ 31.952697] usb 2-1: new SuperSpeed Plus Gen 2x1 USB device number 3 using xhci_hcd
[ 31.965122] usb 2-1: device descriptor read/8, error -71
[ 32.080991] usb usb2-port1: attempt power cycle
...
The problem was caused by the commit forgetting that in SuperSpeed or
faster devices, the device descriptor uses a logarithmic encoding of
the bMaxPacketSize0 value. (For some reason I thought the 255 case in
the switch statement was meant for these devices, but it isn't -- it
was meant for Wireless USB and is no longer needed.)
We can fix the oversight by testing for buf->bMaxPacketSize0 = 9
(meaning 512, the actual maxpacket size for ep0 on all SuperSpeed
devices) and straightening out the logic that checks and adjusts our
initial guesses of the maxpacket value.
Reported-and-tested-by: Thinh Nguyen <email address hidden>
Closes: https://<email address hidden>/
Signed-off-by: Alan Stern <email address hidden>
Fixes: 85d07c556216 ("USB: core: Unite old scheme and new scheme descriptor reads")
Link: https://<email address hidden>
Signed-off-by: Greg Kroah-Hartman <email address hidden>
(cherry picked from commit 59cf445754566984fd55af19ba7146c76e6627bc)
Signed-off-by: Kai-Heng Feng <email address hidden>
Acked-by: Stefan Bader <email address hidden>
Acked-by: Roxana Nicolescu <email address hidden>
Signed-off-by: Stefan Bader <email address hidden>
a53e432...
by
Christopher Bednarz <email address hidden>
RDMA/irdma: Prevent zero-length STAG registration
Currently irdma allows zero-length STAGs to be programmed in HW during
the kernel mode fast register flow. Zero-length MR or STAG registration
disable HW memory length checks.
Improve gaps in bounds checking in irdma by preventing zero-length STAG or
MR registrations except if the IB_PD_UNSAFE_GLOBAL_RKEY is set.
RDMA/irdma: optimize rx path by removing unnecessary copy
In the function irdma_post_recv, the function irdma_copy_sg_list is
not needed since the struct irdma_sge and ib_sge have the similar
member variables. The struct irdma_sge can be replaced with the
struct ib_sge totally.
