Hi Mark, Geert, > On Thu, Sep 26, 2019 at 04:06:45PM +0200, Lukasz Majewski wrote: > > > On Thu, Sep 26, 2019 at 2:49 PM Lukasz Majewski <[email protected]> > > > wrote: > > > > > The question is if we shall call the spi_slave_abort() when > > > > cleaning up spi after releasing last reference, or each time > > > > release callback is called ? > > > > TBH, I don't know. Is it realistic that there are multiple > > > opens? > > > I'm using on my setup only one test program to use /dev/spidevX.Y > > and /dev/spidevA.B (loopback with wired connection). > > > However, you also shall be able to connect via ssh and run the same > > setup in parallel... > > It doesn't seem entirely realistic, but I can imagine cases like > fork()/exec() where we end up with two copies of the file open > but end up immediately closing one. > > > > That means the abort is called only for the last user. > > > And only if the underlying device still exists. Which means that > > > if it has disappeared (how can that happen? spidev unbind?), > > > In my case, I just disconnect some SPI signals and the test program > > just hangs. I do need to ctrl+c to stop it (or use timeout). > > > From my debugging the .release callback is called each time the > > program is aborted (either with ctrl+c or timeout). > > Should be on file close IIRC.
Any ideas on how to solve this issue? Maybe, it would be sufficient for now to move the spi_slave_abort() in spi_release() before we decrease (spidev->users--) the use count? Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: [email protected]
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