Hello Alex Dewar,
The patch fbcfdfab4a2c: "staging: emxx_udc: Allow for building on
!ARM" from Aug 18, 2020, leads to the following static checker
warning:
drivers/staging/emxx_udc/emxx_udc.c:2167 _nbu2ss_enable_controller() warn:
inconsistent indenting
drivers/staging/emxx_udc/emxx_udc.c:2179 _nbu2ss_enable_controller() warn:
inconsistent indenting
drivers/staging/emxx_udc/emxx_udc.c:2277 _nbu2ss_check_vbus() warn: 'reg_dt'
can be either negative or positive
drivers/staging/emxx_udc/emxx_udc.c:2352 _nbu2ss_udc_irq() warn:
'gpiod_get_value(vbus_gpio)' returns positive and negative
drivers/staging/emxx_udc/emxx_udc.c:2361 _nbu2ss_udc_irq() warn:
'gpiod_get_value(vbus_gpio)' returns positive and negative
drivers/staging/emxx_udc/emxx_udc.c:2324 _nbu2ss_int_usb_suspend() warn:
'reg_dt' can be either negative or positive
drivers/staging/emxx_udc/emxx_udc.c:2596 nbu2ss_ep_queue() error: NULL
dereference inside function
drivers/staging/emxx_udc/emxx_udc.c:2795 nbu2ss_ep_fifo_flush() warn: 'data'
can be either negative or positive
drivers/staging/emxx_udc/emxx_udc.c:3151 nbu2ss_drv_remove() error: NULL
dereference inside function
drivers/staging/emxx_udc/emxx_udc.c
2580 if (unlikely(!udc->driver)) {
2581 dev_err(udc->dev, "%s, bogus device state %p\n",
__func__,
2582 udc->driver);
2583 return -ESHUTDOWN;
2584 }
2585
2586 spin_lock_irqsave(&udc->lock, flags);
2587
2588 #ifdef USE_DMA
2589 if ((uintptr_t)req->req.buf & 0x3)
2590 req->unaligned = true;
2591 else
2592 req->unaligned = false;
2593
2594 if (req->unaligned) {
2595 if (!ep->virt_buf)
2596 ep->virt_buf = dma_alloc_coherent(NULL,
PAGE_SIZE,
^^^^
This will oops.
2597 &ep->phys_buf,
2598 GFP_ATOMIC |
GFP_DMA);
2599 if (ep->epnum > 0) {
2600 if (ep->direct == USB_DIR_IN)
2601 memcpy(ep->virt_buf, req->req.buf,
2602 req->req.length);
2603 }
2604 }
2605
2606 if ((ep->epnum > 0) && (ep->direct == USB_DIR_OUT) &&
2607 (req->req.dma != 0))
2608 _nbu2ss_dma_map_single(udc, ep, req, USB_DIR_OUT);
2609 #endif
2610
regards,
dan carpenter
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