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Date: Wed, 19 Jun 2019 07:55:28 +0100 From: Colin Ian King <colin.king@...onical.com> To: Martin Blumenstingl <martin.blumenstingl@...glemail.com> Cc: alexandre.torgue@...com, davem@...emloft.net, joabreu@...opsys.com, kernel-janitors@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, mcoquelin.stm32@...il.com, netdev@...r.kernel.org, peppe.cavallaro@...com Subject: Re: [PATCH] net: stmmac: add sanity check to device_property_read_u32_array call On 19/06/2019 06:13, Martin Blumenstingl wrote: > Hi Colin, > >> Currently the call to device_property_read_u32_array is not error checked >> leading to potential garbage values in the delays array that are then used >> in msleep delays. Add a sanity check to the property fetching. >> >> Addresses-Coverity: ("Uninitialized scalar variable") >> Signed-off-by: Colin Ian King <colin.king@...onical.com> > I have also sent a patch [0] to fix initialize the array. > can you please look at my patch so we can work out which one to use? > > my concern is that the "snps,reset-delays-us" property is optional, > the current dt-bindings documentation states that it's a required > property. in reality it isn't, there are boards (two examples are > mentioned in my patch: [0]) without it. > > so I believe that the resulting behavior has to be: > 1. don't delay if this property is missing (instead of delaying for > <garbage value> ms) > 2. don't error out if this property is missing > > your patch covers #1, can you please check whether #2 is also covered? > I tested case #2 when submitting my patch and it worked fine (even > though I could not reproduce the garbage values which are being read > on some boards) > > > Thank you! > Martin > > > [0] https://lkml.org/lkml/2019/4/19/638 > Is that the correct link? Colin
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