Date: Mon, 15 Jan 2001 17:26:48 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: freebsd-scsi@freebsd.org, alpha@freebsd.org Subject: huh... watch out for overflows... Message-ID: <Pine.LNX.4.21.0101151721540.8362-100000@zeppo.feral.com>
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This construct is fairly common in CAM drivers: timeout(XXXX, YYYYY, (ccb->ccb_h.timeout * hz)/1000); The problem here is that timeout is u_int32_t and that some platforms have a high hz rate (1024 on some alphas, e.g.). If you take the normal tape timeout of two hours for an I/O operation, and keeping in mind that timeout is in milliseconds, you overflow 32 bits, thus leading to a timeout with a somewhat unpredictable (but surely wrong) value. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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