Hello Alexandre TORGUE,
The patch 753a71090f33: "stmmac: add descriptors function for GMAC
4.xx" from Apr 1, 2016, leads to the following static checker warning:
drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c:261 dwmac4_rd_prepare_tx_desc()
warn: odd binop '0x4000 & 0x3fff'
drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
251 static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
252 bool csum_flag, int mode, bool tx_own,
253 bool ls)
254 {
255 unsigned int tdes3 = p->des3;
256
257 if (unlikely(len > BUF_SIZE_16KiB)) {
258 p->des2 |= (((len - BUF_SIZE_16KiB) <<
259 TDES2_BUFFER2_SIZE_MASK_SHIFT)
260 & TDES2_BUFFER2_SIZE_MASK)
261 | (BUF_SIZE_16KiB & TDES2_BUFFER1_SIZE_MASK);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Should this be "len & TDES2_BUFFER1_SIZE_MASK" or are you rounding down
the length deliberately?
262 } else {
263 p->des2 |= (len & TDES2_BUFFER1_SIZE_MASK);
264 }
265
266 if (is_fs)
267 tdes3 |= TDES3_FIRST_DESCRIPTOR;
268 else
269 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
270
regards,
dan carpenter
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