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    Subject[BUG] sg.c: sleeping function called from invalid context
    Date
    	KERNEL_VERSION: 2.6.31
    DESCRIBE:
    Driver sg.c might sleep in atomic context, because it calls
    scsi_device_put under lock_kernel.

    /drivers/scsi/sg.c:306:
    static int
    sg_open(struct inode *inode, struct file *filp)
    {
    ...
    lock_kernel();
    ...
    error_out:
    if (retval)
    scsi_device_put(sdp->device);
    ...

    Path to might_sleep macro from scsi_device_put:
    1. scsi_device_put calls put_device at ./drivers/scsi/scsi.c:1111
    2. put_device calls kobject_put at ./drivers/base/core.c:1038
    3. kobject_put calls kref_put at ./lib/kobject.c
    4. kref_put may call callback function kobject_release at ./lib/kref.c if
    refcount becomes zero, which might_sleep because it calls user event. Details:
    5.1 kobject_cleanup calls kobject_uevent at ./lib/kobject.c:555
    5.2 kobject_uevent calls kobject_uevent_env at ./lib/kobject_uevent.c:282
    5.3 kobject_uevent_env calls call_usermodehelper_exec at
    include/linux/kmod.h:83
    5.4 call_usermodehelper_exec calls wait_for_completion at ./kernel/kmod.c:481
    5.5 wait_for_completion calls wait_for_common at ./kernel/sched.c:5710
    5.6 wait_for_common calls might_sleep at ./kernels/sched.c:5692

    Found by: Linux Driver Verification


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