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authorMichael S. Tsirkin <mst@redhat.com>2012-09-16 11:50:30 +0300
committerMarcelo Tosatti <mtosatti@redhat.com>2012-09-17 13:46:32 -0300
commit9fc77441e5e1bf80b794cc546d2243ee9f4afb75 (patch)
tree4661976f4fea7606a54b3f5276c0ecb45760979c /block/blk.h
parent7454766f7bead388251aedee35a478356a7f4e72 (diff)
KVM: make processes waiting on vcpu mutex killable
vcpu mutex can be held for unlimited time so taking it with mutex_lock on an ioctl is wrong: one process could be passed a vcpu fd and call this ioctl on the vcpu used by another process, it will then be unkillable until the owner exits. Call mutex_lock_killable instead and return status. Note: mutex_lock_interruptible would be even nicer, but I am not sure all users are prepared to handle EINTR from these ioctls. They might misinterpret it as an error. Cleanup paths expect a vcpu that can't be used by any userspace so this will always succeed - catch bugs by calling BUG_ON. Catch callers that don't check return state by adding __must_check. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'block/blk.h')
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