Current algorithm picks the first fifo which is equal to or greater than the required size. This can result in bigger fifos assigned to endpoints with smaller maxps. Change the algorithm to pick the smallest fifo which is greater than or equal to the required size.
Moreover, only use signed variables when required. Signed-off-by: Mian Yousaf Kaukab <[email protected]> --- drivers/usb/dwc2/gadget.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index a7329b1..e06cac0 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -2439,12 +2439,12 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep, struct s3c_hsotg_ep *hs_ep = our_ep(ep); struct dwc2_hsotg *hsotg = hs_ep->parent; unsigned long flags; - int index = hs_ep->index; + unsigned int index = hs_ep->index; u32 epctrl_reg; u32 epctrl; u32 mps; - int dir_in; - int i, val, size; + unsigned int dir_in; + unsigned int i, val, size; int ret = 0; dev_dbg(hsotg->dev, @@ -2533,6 +2533,8 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep, * a unique tx-fifo even if it is non-periodic. */ if (dir_in && hsotg->dedicated_fifos) { + u32 fifo_index = 0; + u32 fifo_size = UINT_MAX; size = hs_ep->ep.maxpacket*hs_ep->mc; for (i = 1; i < hsotg->num_of_eps; ++i) { if (hsotg->fifo_map & (1<<i)) @@ -2541,19 +2543,22 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep, val = (val >> FIFOSIZE_DEPTH_SHIFT)*4; if (val < size) continue; - hsotg->fifo_map |= 1<<i; - - epctrl |= DXEPCTL_TXFNUM(i); - hs_ep->fifo_index = i; - hs_ep->fifo_size = val; - break; + /* Search for smallest acceptable fifo */ + if (val < fifo_size) { + fifo_size = val; + fifo_index = i; + } } - if (i == hsotg->num_of_eps) { + if (!fifo_index) { dev_err(hsotg->dev, "%s: No suitable fifo found\n", __func__); ret = -ENOMEM; goto error; } + hsotg->fifo_map |= 1 << fifo_index; + epctrl |= DXEPCTL_TXFNUM(fifo_index); + hs_ep->fifo_index = fifo_index; + hs_ep->fifo_size = fifo_size; } /* for non control endpoints, set PID to D0 */ -- 1.9.1 ---------------------------------------------------------------------- Intel Sweden AB Registered Office: Knarrarnasgatan 15, 164 40 Kista, Stockholm, Sweden Registration Number: 556189-6027 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
