Hello Peter Ujfalusi,
The patch 6a1560ecaa8c: "media: v4l: omap_vout: vrfb: Convert to
dmaengine" from May 3, 2017, leads to the following static checker
warning:
drivers/media/platform/omap/omap_vout_vrfb.c:273
omap_vout_prepare_vrfb()
error: uninitialized symbol 'flags'.
drivers/media/platform/omap/omap_vout_vrfb.c
232 int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
233 struct videobuf_buffer *vb)
234 {
235 struct dma_async_tx_descriptor *tx;
236 enum dma_ctrl_flags flags;
^^^^^
237 struct dma_chan *chan = vout->vrfb_dma_tx.chan;
238 struct dma_device *dmadev = chan->device;
239 struct dma_interleaved_template *xt = vout->vrfb_dma_tx.xt;
240 dma_cookie_t cookie;
241 enum dma_status status;
242 enum dss_rotation rotation;
243 size_t dst_icg;
244 u32 pixsize;
245
246 if (!is_rotation_enabled(vout))
247 return 0;
248
249 /* If rotation is enabled, copy input buffer into VRFB
250 * memory space using DMA. We are copying input buffer
251 * into VRFB memory space of desired angle and DSS will
252 * read image VRFB memory for 0 degree angle
253 */
254
255 pixsize = vout->bpp * vout->vrfb_bpp;
256 dst_icg = ((MAX_PIXELS_PER_LINE * pixsize) -
257 (vout->pix.width * vout->bpp)) + 1;
258
259 xt->src_start = vout->buf_phy_addr[vb->i];
260 xt->dst_start = vout->vrfb_context[vb->i].paddr[0];
261
262 xt->numf = vout->pix.height;
263 xt->frame_size = 1;
264 xt->sgl[0].size = vout->pix.width * vout->bpp;
265 xt->sgl[0].icg = dst_icg;
266
267 xt->dir = DMA_MEM_TO_MEM;
268 xt->src_sgl = false;
269 xt->src_inc = true;
270 xt->dst_sgl = true;
271 xt->dst_inc = true;
272
273 tx = dmadev->device_prep_interleaved_dma(chan, xt, flags);
^^^^^
I'm surprised new versions of GCC don't complain about this.
274 if (tx == NULL) {
275 pr_err("%s: DMA interleaved prep error\n", __func__);
276 return -EINVAL;
regards,
dan carpenter
