Red Hat ENTERPRISE LINUX 5.5 - TECHNICAL NOTES Manual page 135

RHSA-2010:0178: Important Red Hat Enterprise Linux 5.5 kernel security and bug fix update
This update was necessary to address an issue found where, using IPoIB, connectivity would be
lost with a single host but maintained with other hosts.
• USB driver update.
This driver update avoids USB 1.1 device failures that may occur due to requests from USB OHCI
controllers being overwritten if the latency for any pending request by the USB controller is very long
(in the range of milliseconds).
• Add qcserial module to Red Hat Enterprise Linux 5 kernel.
This module was added to support the Qualcomm WWAN cards used by some laptops.
• sysctl: Require CAP_SYS_RAWIO to set mmap_min_addr.
• Enable msi-x correctly on qlogic 2xxx series.
This update enables the FC and FCoE drivers to use MSI-X or MSI interrupts when they are
available. The ql2xenablemsix can be used to override this:
0 = enable traditional pin-based interrupt mechanism
1 = enable MSI-X interrupt mechanism
2 = enable MSI interrupt mechanism
• Implement futex priority-based wakeup.
A problem was found where the threads waiting on the futex_q queue list would acquire the mutex
lock in the order they were queued rather than by priority. This update addresses that problem.
• Make scsi_dh_activate() asynchronous to address the slower LUN failovers with large
BZ#537514
numbers of LUNs.
• [scsi] Fix inconsistent usage of max_lun
• Fix dlm_recv deadlock under memory pressure while processing GFP_KERNEL locks.
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• [scsi] Panic at .ipr_sata_reset after device reset.
• [scsi] Export scsilun_to_int symbol.
This symbol is needed by some drivers, and without this update they each tend to use their own
copy of the entire function.
• Ensure pci_dev->is_enabled is set.
Failure to set this may cause suspend/resume to fail on some devices.
• Fix a bug in rwsem_is_locked() function.
• [scsi] cciss: Ignore stale commands after reboot.
• Fix a mistake in ACPI debug statement that prevents kernel compilation.
• Fix panic in cpufreq_get on DL785-G6.
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BZ#531552
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BZ#528153
BZ#527496
BZ#523888
BZ#534018
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