On Mon, 2012-09-24 at 09:44 +0400, James Bottomley wrote: > On Mon, 2012-09-24 at 13:30 +0800, Li Zhong wrote: > > Just noticed that after commit 919f797, it is possible that > > scsi_cmd_to_driver() returns NULL. This patch adds the NULL checking for > > drv > > returned from the above function. > > > > Maybe it is not possible at run time, but from the code itself, we'd better > > have this check? > > There's not much point having a check that never trips, unless it's an > assert, in which case a NULL deref does that. All it does is add > pointless instructions to the critical path. only REQ_TYPE_BLOCK_PC > commands can be submitted without a driver, so the check above would > seem to preclude that.
Hi James, Thank you, it sounds reasonable to me. Let's drop it. Thanks, Zhong > James > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
