Revision be14eb619108fa8b7120eb2c42d66d5f623ae10e authored by Brian King on 10 September 2010, 07:03:21 UTC, committed by Jens Axboe on 10 September 2010, 07:03:21 UTC
While testing CPU DLPAR, the following problem was discovered. We were DLPAR removing the first CPU, which in this case was logical CPUs 0-3. CPUs 0-2 were already marked offline and we were in the process of offlining CPU 3. After marking the CPU inactive and offline in cpu_disable, but before the cpu was completely idle (cpu_die), we ended up in __make_request on CPU 3. There we looked at the topology map to see which CPU to complete the I/O on and found no CPUs in the cpu_sibling_map. This resulted in the block layer setting the completion cpu to be NR_CPUS, which then caused an oops when we tried to complete the I/O. Fix this by sanity checking the value we return from blk_cpu_to_group to be a valid cpu value. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
1 parent edce682
| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 901 bytes |
| Makefile | -rw-r--r-- | 144 bytes |
| lapb_iface.c | -rw-r--r-- | 9.0 KB |
| lapb_in.c | -rw-r--r-- | 18.2 KB |
| lapb_out.c | -rw-r--r-- | 5.2 KB |
| lapb_subr.c | -rw-r--r-- | 7.8 KB |
| lapb_timer.c | -rw-r--r-- | 4.5 KB |
Computing file changes ...
