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usb: wusbcore: move isoc_frame_index from wa_xfer to wa_seg 

If multiple segments belonging to an isoc transfer are submitted
concurrently, the isoc_frame_index field in struct wa_xfer can get
corrupted.  This patch moves the isoc_frame_index field from struct
wa_xfer to struct wa_seg to prevent this from happening.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Pugliese 2013-12-09 14:15:14 -06:00 committed by Greg Kroah-Hartman
parent 7b3e3740f2
commit ea1af42d3d
1 changed files with 10 additions and 11 deletions
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21
drivers/usb/wusbcore/wa-xfer.c
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@ -124,6 +124,8 @@ struct wa_seg {
u8 index; /* which segment we are */
int isoc_frame_count; /* number of isoc frames in this segment. */
int isoc_frame_offset; /* starting frame offset in the xfer URB. */
/* Isoc frame that the current transfer buffer corresponds to. */
int isoc_frame_index;
int isoc_size; /* size of all isoc frames sent by this seg. */
enum wa_seg_status status;
ssize_t result; /* bytes xfered or error */
@ -158,8 +160,6 @@ struct wa_xfer {
unsigned is_dma:1;
size_t seg_size;
int result;
/* Isoc frame that the current transfer buffer corresponds to. */
int dto_isoc_frame_index;
gfp_t gfp; /* allocation mask */
@ -701,23 +701,23 @@ static void wa_seg_dto_cb(struct urb *urb)
if (usb_pipeisoc(xfer->urb->pipe)) {
/* Alereon HWA sends all isoc frames in a single transfer. */
if (wa->quirks & WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC)
xfer->dto_isoc_frame_index += seg->isoc_frame_count;
seg->isoc_frame_index += seg->isoc_frame_count;
else
xfer->dto_isoc_frame_index += 1;
if (xfer->dto_isoc_frame_index < seg->isoc_frame_count) {
seg->isoc_frame_index += 1;
if (seg->isoc_frame_index < seg->isoc_frame_count) {
data_send_done = 0;
holding_dto = 1; /* checked in error cases. */
/*
* if this is the last isoc frame of the segment, we
* can release DTO after sending this frame.
*/
if ((xfer->dto_isoc_frame_index + 1) >=
if ((seg->isoc_frame_index + 1) >=
seg->isoc_frame_count)
release_dto = 1;
}
dev_dbg(dev, "xfer 0x%08X#%u: isoc frame = %d, holding_dto = %d, release_dto = %d.\n",
wa_xfer_id(xfer), seg->index,
xfer->dto_isoc_frame_index, holding_dto, release_dto);
wa_xfer_id(xfer), seg->index, seg->isoc_frame_index,
holding_dto, release_dto);
}
spin_unlock_irqrestore(&xfer->lock, flags);
@ -737,8 +737,7 @@ static void wa_seg_dto_cb(struct urb *urb)
* send the URB and release DTO if we no longer need it.
*/
__wa_populate_dto_urb_isoc(xfer, seg,
seg->isoc_frame_offset +
xfer->dto_isoc_frame_index);
seg->isoc_frame_offset + seg->isoc_frame_index);
/* resubmit the URB with the next isoc frame. */
result = usb_submit_urb(seg->dto_urb, GFP_ATOMIC);
@ -1324,12 +1323,12 @@ static int __wa_seg_submit(struct wa_rpipe *rpipe, struct wa_xfer *xfer,
struct wahc *wa = xfer->wa;
result = usb_submit_urb(seg->isoc_pack_desc_urb, GFP_ATOMIC);
seg->isoc_frame_index = 0;
if (result < 0) {
pr_err("%s: xfer %p#%u: ISO packet descriptor submit failed: %d\n",
__func__, xfer, seg->index, result);
goto error_iso_pack_desc_submit;
}
xfer->dto_isoc_frame_index = 0;
/*
* If this segment contains more than one isoc frame, hold
* onto the dto resource until we send all frames.