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Date: Wed, 22 Oct 2014 16:12:57 -0400 (EDT) From: David Miller <davem@...emloft.net> To: geert@...ux-m68k.org Cc: isubramanian@....com, kchudgar@....com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] drivers: net: xgene: Rewrite loop in xgene_enet_ecc_init() From: Geert Uytterhoeven <geert@...ux-m68k.org> Date: Wed, 22 Oct 2014 21:50:06 +0200 > On Wed, Oct 22, 2014 at 9:34 PM, David Miller <davem@...emloft.net> wrote: >> From: Geert Uytterhoeven <geert@...ux-m68k.org> >> Date: Wed, 22 Oct 2014 09:39:41 +0200 >> >>> drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c: In function ‘xgene_enet_ecc_init’: >>> drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c:126: warning: ‘data’ may be used uninitialized in this function >>> >>> Depending on the arbitrary value on the stack, the loop may terminate >>> too early, and cause a bogus -ENODEV failure. >>> >>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org> >>> --- >>> v2: Rewrite the loop instead of pre-initializing data. >> >> I hate to be a pest, but like the other patch of your's I think >> a do { } while() works best here because the intent is clearly >> to run the loop at least once, right? > > I wanted to avoid checking for "data != ~0U" twice: once to abort the loop, > and once to check if a timeout happened. Hmmm: do { usleep_range(...); data = ...(); if (data == ~0) return 0; } while (++i < 10); netdev_err(...); return -ENODEV; Why would you have to check data twice?
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