floppy: select FDC before arming timeout work#794
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floppy_shutdown() uses current_fdc to choose which controller state to mark for reset when fd_timeout expires. lock_fdc() currently arms that timeout before set_fdc() has selected the drive/FDC and updated current_drive/current_fdc. drive_params[drive].timeout is user configurable, so the timeout can be immediate. Even with a non-zero timeout, a delayed caller can leave the timeout work running while set_fdc() is still testing fdc_state[fdc].rawcmd and updating the adjacent reset bitfield. The timeout can then use stale selected-controller state or race the reset bitfield update. Move the timeout arm after set_fdc() in lock_fdc(), and keep the same ordering for the direct floppy_queue_rq() path. This ensures fd_timeout cannot run until the selected-controller state describes the operation being timed. Fixes: 1da177e ("Linux-2.6.12-rc2") Signed-off-by: Cen Zhang <zzzccc427@gmail.com> Reviewed-by: Denis Efremov (Oracle) <efremov@linux.com>
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Pull request for series with
subject: floppy: select FDC before arming timeout work
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1089071