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Subjectdrivers/net/ethernet/stmicro/stmmac/dwmac_lib.c:224 dwmac_dma_flush_tx_fifo() warn: this loop depends on readl() succeeding
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: fb893de323e2d39f7a1f6df425703a2edbdf56ea
commit: 05933aac7b11911955de307a329dc2a7a14b7bd0 ia64: remove now unused machvec indirections
date: 12 months ago
config: ia64-randconfig-m031-20200811 (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

smatch warnings:
drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c:224 dwmac_dma_flush_tx_fifo() warn: this loop depends on readl() succeeding

vim +224 drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c

aec7ff27814528 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-01-06 218
ad01b7d480a4a1 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-08-23 219 void dwmac_dma_flush_tx_fifo(void __iomem *ioaddr)
688911c2f5e5e4 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-04-13 220 {
688911c2f5e5e4 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-04-13 221 u32 csr6 = readl(ioaddr + DMA_CONTROL);
688911c2f5e5e4 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-04-13 222 writel((csr6 | DMA_CONTROL_FTF), ioaddr + DMA_CONTROL);
688911c2f5e5e4 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-04-13 223
688911c2f5e5e4 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-04-13 @224 do {} while ((readl(ioaddr + DMA_CONTROL) & DMA_CONTROL_FTF));
688911c2f5e5e4 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-04-13 225 }
aec7ff27814528 drivers/net/stmmac/dwmac_lib.c Giuseppe CAVALLARO 2010-01-06 226

:::::: The code at line 224 was first introduced by commit
:::::: 688911c2f5e5e4f33b5a1c32839184f1fdf814ee stmmac: fix Transmit FIFO flush operation

:::::: TO: Giuseppe CAVALLARO <peppe.cavallaro@st.com>
:::::: CC: David S. Miller <davem@davemloft.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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