patch "usb: cdns3: gadget: always zeroed TRB buffer when enable endpoint" added to usb-next

patch "usb: cdns3: gadget: always zeroed TRB buffer when enable endpoint" added to usb-next

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: cdns3: gadget: always zeroed TRB buffer when enable endpoint

to my usb git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-next branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release
during the merge window.

If you have any questions about this process, please let me know.


From 95f5acfc4f58f01a22b66d8c9c0ffb72aa96271c Mon Sep 17 00:00:00 2001
From: Peter Chen <peter.chen@nxp.com>
Date: Wed, 22 Jul 2020 11:06:19 +0800
Subject: usb: cdns3: gadget: always zeroed TRB buffer when enable endpoint

During the endpoint dequeue operation, it changes dequeued TRB as link
TRB, when the endpoint is disabled and re-enabled, the DMA fetches the
TRB before the link TRB, after it handles current TRB, the DMA pointer
will advance to the TRB after link TRB, but enqueue and dequene
variables don't know it due to no hardware interrupt at the time, when
the next TRB is added to link TRB position, the DMA will not handle
this TRB due to its pointer is already at the next TRB. See the trace
log like below:

file-storage-675   [001] d..1    86.585657: usb_ep_queue: ep0: req 00000000df9b3a4f length 0/0 sgs 0/0 stream 0 zsI status 0 --> 0
file-storage-675   [001] d..1    86.585663: cdns3_ep_queue: ep1out: req: 000000002ebce364, req buff 00000000f5bc96b4, length: 0/1024 zsi, status: -115, trb: [start:0, end:0: virt addr (null)], flags:0 SID: 0
file-storage-675   [001] d..1    86.585671: cdns3_prepare_trb: ep1out: trb 000000007f770303, dma buf: 0xbd195800, size: 1024, burst: 128 ctrl: 0x00000425 (C=1, T=0, ISP, IOC, Normal) SID:0 LAST_SID:0
file-storage-675   [001] d..1    86.585676: cdns3_ring:
            Ring contents for ep1out:
            Ring deq index: 0, trb: 000000007f770303 (virt), 0xc4003000 (dma)
            Ring enq index: 1, trb: 0000000049c1ba21 (virt), 0xc400300c (dma)
            free trbs: 38, CCS=1, PCS=1
            @0x00000000c4003000 bd195800 80020400 00000425
            @0x00000000c400300c c4003018 80020400 00001811
            @0x00000000c4003018 bcfcc000 0000001f 00000426
            @0x00000000c4003024 bcfce800 0000001f 00000426

	    ...

 irq/144-5b13000-698   [000] d...    87.619286: usb_gadget_giveback_request: ep1in: req 0000000031b832eb length 13/13 sgs 0/0 stream 0 zsI status 0 --> 0
    file-storage-675   [001] d..1    87.619287: cdns3_ep_queue: ep1out: req: 000000002ebce364, req buff 00000000f5bc96b4, length: 0/1024 zsi, status: -115, trb: [start:0, end:0: virt addr 0x80020400c400300c], flags:0 SID: 0
    file-storage-675   [001] d..1    87.619294: cdns3_prepare_trb: ep1out: trb 0000000049c1ba21, dma buf: 0xbd198000, size: 1024, burst: 128 ctrl: 0x00000425 (C=1, T=0, ISP, IOC, Normal) SID:0 LAST_SID:0
    file-storage-675   [001] d..1    87.619297: cdns3_ring:
                Ring contents for ep1out:
                Ring deq index: 1, trb: 0000000049c1ba21 (virt), 0xc400300c (dma)
                Ring enq index: 2, trb: 0000000059b34b67 (virt), 0xc4003018 (dma)
                free trbs: 38, CCS=1, PCS=1
                @0x00000000c4003000 bd195800 0000001f 00000427
                @0x00000000c400300c bd198000 80020400 00000425
                @0x00000000c4003018 bcfcc000 0000001f 00000426
                @0x00000000c4003024 bcfce800 0000001f 00000426
		...

    file-storage-675   [001] d..1    87.619305: cdns3_doorbell_epx: ep1out, ep_trbaddr c4003018
    file-storage-675   [001] ....    87.619308: usb_ep_queue: ep1out: req 000000002ebce364 length 0/1024 sgs 0/0 stream 0 zsI status -115 --> 0
 irq/144-5b13000-698   [000] d..1    87.619315: cdns3_epx_irq: IRQ for ep1out: 01000c80 TRBERR , ep_traddr: c4003018 ep_last_sid: 00000000 use_streams: 0
 irq/144-5b13000-698   [000] d..1    87.619395: cdns3_usb_irq: IRQ 00000008 = Hot Reset

Fixes: f616c3bda47e ("usb: cdns3: Fix dequeue implementation")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
---
 drivers/usb/cdns3/gadget.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index 5b4b16bf4164..65a154d47f8e 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -242,9 +242,10 @@ int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep)
 			return -ENOMEM;
 
 		priv_ep->alloc_ring_size = ring_size;
-		memset(priv_ep->trb_pool, 0, ring_size);
 	}
 
+	memset(priv_ep->trb_pool, 0, ring_size);
+
 	priv_ep->num_trbs = num_trbs;
 
 	if (!priv_ep->num)
-- 
2.27.0