[Bug 195607] New: Megaraid_sas raidcard hotswap wouldn't work if hold the fd of block devcie in user space

[Bug 195607] New: Megaraid_sas raidcard hotswap wouldn't work if hold the fd of block devcie in user space

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=195607

            Bug ID: 195607
           Summary: Megaraid_sas raidcard hotswap wouldn't work if hold
                    the fd of block devcie in user space
           Product: SCSI Drivers
           Version: 2.5
    Kernel Version: 3.10.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: scsi_drivers-other@kernel-bugs.osdl.org
          Reporter: johnzzpcrystal@gmail.com
        Regression: No

reproduce :

1.choose a megaraid sas series raidcard, for example:
LSI Logic / Symbios Logic MegaRAID　SAS 2008 [Falcon] (rev 03)

2. configure the raid card as HBA card (all disks are jbod mode)
We assume /dev/sdb is attached to this raid card

3.run process:
fd = open("/dev/sdb", O_RDWR);
while (1) {
    sleep (10);
}

4. run "udevadm monitor" watch udev message in a new shell

5.unplug disk sdb and then insert 

We can see new udev message about disk's hotswap

6.redo process 5
There will be no udev message only if you reboot the server

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