# Re: Problem in sanei_scsi.c

From: abel deuring (a.deuring@satzbau-gmbh.de)
Date: Fri May 26 2000 - 06:15:00 PDT

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  Douglas Gilbert wrote:
  >
  > Simon Munton wrote:
  > >
  > > Hi,
  > >
  > > I've found a problem in the issue() function in sanei_scsi.c, that results
  > > in the queue in sg filling up, and prevents any more scsi commands being
  > > issued until the device is closed.
  > >
  > > There is a test on line 1690 which can erroneously try to reissue a scsi
  > > command:
  > > if (rp == fdp->sane_qhead && errno == EAGAIN)
  > >
  > > The first time through the enclosing while loop, rp == fdp->sane_qhead. But
  > > if the write() call issuing the command was successful, errno is left
  > > unchanged, and if errno happens to contain EAGAIN, then the command is
  > > issued again, and again... until the command queue in sg is full.
  >
  > Simon,
  > This may explain the strange behaviour that I saw on a
  > Umax 1220S and reported to Oliver Rauch.

  Douglas and Simon,

  I agree, this explains the behaviour reported by Douglas. I've put the
  fix to the CVS server.

  Thanks for fixing the bug, Simon.

  Abel

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