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Message-ID: <463EED3F.9080106@otello.alma.unibo.it> Date: Mon, 07 May 2007 11:11:27 +0200 From: Diego Zuccato <diego@...llo.alma.unibo.it> To: Paul Fulghum <paulkf@...rogate.com> Cc: linux-kernel@...r.kernel.org, linux-usb-users@...ts.sourceforge.net Subject: Re: [Linux-usb-users] [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug] Paul Fulghum ha scritto: > There is no one policy here that will make everyone happy. > Some will want all the data before some was lost, > others the data after some was lost. IMVHO the only sane thing is ALWAYS avoid "holes" (some old data, then the "hole" of lost data, then some new data) after a flush(). HW buffers (and buffers on the remote end) are not an issue: they contain fresher data (usually in "sliding window" mode) than buffered. Thinking with a 300bps modem (anybody else remembers such an ancient thing?): - Sender have to transmit the alphabet; - On the sender's modem there's a 4 char buffer - On the receiver's modem there's another 4 char buffer - The receiver's driver have another 4 char buffer If the receiver issues a flush() after reading 'C', then the next read() should return FGHIJKL...Z (or anything IN SEQUENCE), but *NEVER* DEFGKLM (skipped H,I and J). BYtE, Diego. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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