From: Virupax Sadashivpetimath <virupax.sadashivpetimath@xxxxxxxxxxxxxx>
Since highmem PIO URB handling was introduced in:
8e8a551 usb: musb: host: Handle highmem in PIO mode
when a URB is being handled it may happen that the static use_sg flag
was set by a previous URB with buffer in highmem. This leads to error
in handling the present URB.
Fix this by making the use_sg flag URB specific.
Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.7+
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@xxxxxxxxxxxxxx>
Signed-off-by: Fabio Baltieri <fabio.baltieri@xxxxxxxxxx>
---
drivers/usb/musb/musb_host.c | 18 ++++++++----------
drivers/usb/musb/musb_host.h | 1 +
2 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 1a6b5a9..26d3f140 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1232,7 +1232,6 @@ void musb_host_tx(struct musb *musb, u8 epnum)
void __iomem *mbase = musb->mregs;
struct dma_channel *dma;
bool transfer_pending = false;
- static bool use_sg;
musb_ep_select(mbase, epnum);
tx_csr = musb_readw(epio, MUSB_TXCSR);
@@ -1463,9 +1462,9 @@ done:
* NULL.
*/
if (!urb->transfer_buffer)
- use_sg = true;
+ qh->use_sg = true;
- if (use_sg) {
+ if (qh->use_sg) {
/* sg_miter_start is already done in musb_ep_program */
if (!sg_miter_next(&qh->sg_miter)) {
dev_err(musb->controller, "error: sg list empty\n");
@@ -1484,9 +1483,9 @@ done:
qh->segsize = length;
- if (use_sg) {
+ if (qh->use_sg) {
if (offset + length >= urb->transfer_buffer_length)
- use_sg = false;
+ qh->use_sg = false;
}
musb_ep_select(mbase, epnum);
@@ -1552,7 +1551,6 @@ void musb_host_rx(struct musb *musb, u8 epnum)
bool done = false;
u32 status;
struct dma_channel *dma;
- static bool use_sg;
unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG;
musb_ep_select(mbase, epnum);
@@ -1878,12 +1876,12 @@ void musb_host_rx(struct musb *musb, u8 epnum)
* NULL.
*/
if (!urb->transfer_buffer) {
- use_sg = true;
+ qh->use_sg = true;
sg_miter_start(&qh->sg_miter, urb->sg, 1,
sg_flags);
}
- if (use_sg) {
+ if (qh->use_sg) {
if (!sg_miter_next(&qh->sg_miter)) {
dev_err(musb->controller, "error: sg list empty\n");
sg_miter_stop(&qh->sg_miter);
@@ -1913,8 +1911,8 @@ finish:
urb->actual_length += xfer_len;
qh->offset += xfer_len;
if (done) {
- if (use_sg)
- use_sg = false;
+ if (qh->use_sg)
+ qh->use_sg = false;
if (urb->status == -EINPROGRESS)
urb->status = status;
diff --git a/drivers/usb/musb/musb_host.h b/drivers/usb/musb/musb_host.h
index 5a9c8fe..738f7eb 100644
--- a/drivers/usb/musb/musb_host.h
+++ b/drivers/usb/musb/musb_host.h
@@ -74,6 +74,7 @@ struct musb_qh {
u16 frame; /* for periodic schedule */
unsigned iso_idx; /* in urb->iso_frame_desc[] */
struct sg_mapping_iter sg_miter; /* for highmem in PIO mode */
+ bool use_sg; /* to track urb using sglist */
};
/* map from control or bulk queue head to the first qh on that ring */
--
1.8.1.3
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