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

[kernel test robot]

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@xxxxxxxxx>

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@xxxxxx>
:::::: CC: David S. Miller <davem@xxxxxxxxxxxxx>

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