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>
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| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 248 bytes |
| Makefile | -rw-r--r-- | 992 bytes |
| af_llc.c | -rw-r--r-- | 30.7 KB |
| llc_c_ac.c | -rw-r--r-- | 35.4 KB |
| llc_c_ev.c | -rw-r--r-- | 21.3 KB |
| llc_c_st.c | -rw-r--r-- | 149.8 KB |
| llc_conn.c | -rw-r--r-- | 27.2 KB |
| llc_core.c | -rw-r--r-- | 4.2 KB |
| llc_if.c | -rw-r--r-- | 4.4 KB |
| llc_input.c | -rw-r--r-- | 5.5 KB |
| llc_output.c | -rw-r--r-- | 2.4 KB |
| llc_pdu.c | -rw-r--r-- | 10.6 KB |
| llc_proc.c | -rw-r--r-- | 6.6 KB |
| llc_s_ac.c | -rw-r--r-- | 5.9 KB |
| llc_s_ev.c | -rw-r--r-- | 3.5 KB |
| llc_s_st.c | -rw-r--r-- | 5.7 KB |
| llc_sap.c | -rw-r--r-- | 11.4 KB |
| llc_station.c | -rw-r--r-- | 20.7 KB |
| sysctl_net_llc.c | -rw-r--r-- | 2.0 KB |
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