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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2020-06-18 15:11:17 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-06-24 18:14:44 +0300
commitea0efd687b01355cd799c8643d0c636ba4859ffc (patch)
tree4ca8232f2890b361a3296c3a30dd3bf4f2dd2d03 /drivers/usb/renesas_usbhs
parentad38beb373a14e082f4e64b68c0b6e6b09764680 (diff)
downloadlinux-ea0efd687b01355cd799c8643d0c636ba4859ffc.tar.xz
usb: renesas_usbhs: getting residue from callback_result
This driver assumed that dmaengine_tx_status() could return the residue even if the transfer was completed. However, this was not correct usage [1] and this caused to break getting the residue after the commit 24461d9792c2 ("dmaengine: virt-dma: Fix access after free in vchan_complete()") actually. So, this is possible to get wrong received size if the usb controller gets a short packet. For example, g_zero driver causes "bad OUT byte" errors. The usb-dmac driver will support the callback_result, so this driver can use it to get residue correctly. Note that even if the usb-dmac driver has not supported the callback_result yet, this patch doesn't cause any side-effects. [1] https://lore.kernel.org/dmaengine/20200616165550.GP2324254@vkoul-mobl/ Reported-by: Hien Dang <hien.dang.eb@renesas.com> Fixes: 24461d9792c2 ("dmaengine: virt-dma: Fix access after free in vchan_complete()") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/1592482277-19563-1-git-send-email-yoshihiro.shimoda.uh@renesas.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/renesas_usbhs')
-rw-r--r--drivers/usb/renesas_usbhs/fifo.c23
-rw-r--r--drivers/usb/renesas_usbhs/fifo.h2
2 files changed, 14 insertions, 11 deletions
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 01c6a48c41bc..ac9a81ae8216 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -803,7 +803,8 @@ static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
return info->dma_map_ctrl(chan->device->dev, pkt, map);
}
-static void usbhsf_dma_complete(void *arg);
+static void usbhsf_dma_complete(void *arg,
+ const struct dmaengine_result *result);
static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
{
struct usbhs_pipe *pipe = pkt->pipe;
@@ -813,6 +814,7 @@ static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
struct dma_chan *chan;
struct device *dev = usbhs_priv_to_dev(priv);
enum dma_transfer_direction dir;
+ dma_cookie_t cookie;
fifo = usbhs_pipe_to_fifo(pipe);
if (!fifo)
@@ -827,11 +829,11 @@ static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
if (!desc)
return;
- desc->callback = usbhsf_dma_complete;
- desc->callback_param = pipe;
+ desc->callback_result = usbhsf_dma_complete;
+ desc->callback_param = pkt;
- pkt->cookie = dmaengine_submit(desc);
- if (pkt->cookie < 0) {
+ cookie = dmaengine_submit(desc);
+ if (cookie < 0) {
dev_err(dev, "Failed to submit dma descriptor\n");
return;
}
@@ -1152,12 +1154,10 @@ static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
struct dma_chan *chan, int dtln)
{
struct usbhs_pipe *pipe = pkt->pipe;
- struct dma_tx_state state;
size_t received_size;
int maxp = usbhs_pipe_get_maxpacket(pipe);
- dmaengine_tx_status(chan, pkt->cookie, &state);
- received_size = pkt->length - state.residue;
+ received_size = pkt->length - pkt->dma_result->residue;
if (dtln) {
received_size -= USBHS_USB_DMAC_XFER_SIZE;
@@ -1363,13 +1363,16 @@ static int usbhsf_irq_ready(struct usbhs_priv *priv,
return 0;
}
-static void usbhsf_dma_complete(void *arg)
+static void usbhsf_dma_complete(void *arg,
+ const struct dmaengine_result *result)
{
- struct usbhs_pipe *pipe = arg;
+ struct usbhs_pkt *pkt = arg;
+ struct usbhs_pipe *pipe = pkt->pipe;
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
struct device *dev = usbhs_priv_to_dev(priv);
int ret;
+ pkt->dma_result = result;
ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
if (ret < 0)
dev_err(dev, "dma_complete run_error %d : %d\n",
diff --git a/drivers/usb/renesas_usbhs/fifo.h b/drivers/usb/renesas_usbhs/fifo.h
index 7d3700bf41d9..039a2b993157 100644
--- a/drivers/usb/renesas_usbhs/fifo.h
+++ b/drivers/usb/renesas_usbhs/fifo.h
@@ -50,7 +50,7 @@ struct usbhs_pkt {
struct usbhs_pkt *pkt);
struct work_struct work;
dma_addr_t dma;
- dma_cookie_t cookie;
+ const struct dmaengine_result *dma_result;
void *buf;
int length;
int trans;