Date: Fri, 22 Nov 2002 21:28:46 +0300 From: Yar Tikhiy <yar@freebsd.org> To: freebsd-scsi@freebsd.org Subject: {da,sa,...}open bug? Message-ID: <20021122212846.C60810@comp.chem.msu.su>
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Hi folks, While debugging the USB mass storage driver, which uses CAM, I ran into the following doubt. The XXopen() methods of the da, sa etc drivers get a reference to the peripheral ("periph") through cam_periph_acquire() and don't release it on error exit. I suspect this leads to CAM wedge if the device is removed when its driver is in XXopen(). That is because the "periph" stays acquired (refcount > 0), but the XXopen() caller wouldn't invoke XXclose() subsequently since it sees XXopen() having failed. Thus CAM won't ever "forget" the device removed. Moreover, after I had patched daopen() to release the peripheral if returning non-zero error code, the CAM wedge has gone. I'm new to CAM so I'd like to ask if my idea is correct. Thanks. -- Yar To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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