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b95b9452aa
when driver is loaded with Multi Queue enabled, it was noticed that there was one less queue pair created. Following message would indicate this: "No resources to create additional q pair." The result of one less queue pair means that system can crash, if the block mq layer thinks there is an extra hardware queue available, and the driver will use a NULL ptr qpair in that instance. Following stack trace is seen in one of the crash: irq_create_affinity_masks+0x98/0x530 irq_create_affinity_masks+0x98/0x530 __pci_enable_msix+0x321/0x4e0 mutex_lock+0x12/0x40 pci_alloc_irq_vectors_affinity+0xb5/0x140 qla24xx_enable_msix+0x79/0x530 [qla2xxx] qla2x00_request_irqs+0x61/0x2d0 [qla2xxx] qla2x00_probe_one+0xc73/0x2390 [qla2xxx] ida_simple_get+0x98/0x100 kernfs_next_descendant_post+0x40/0x50 local_pci_probe+0x45/0xa0 pci_device_probe+0xfc/0x140 driver_probe_device+0x2c5/0x470 __driver_attach+0xdd/0xe0 driver_probe_device+0x470/0x470 bus_for_each_dev+0x6c/0xc0 driver_attach+0x1e/0x20 bus_add_driver+0x45/0x270 driver_register+0x60/0xe0 __pci_register_driver+0x4c/0x50 qla2x00_module_init+0x1ce/0x21e [qla2xxx] Cc: <stable@vger.kernel.org> # v4.10+ Signed-off-by: Sawan Chandak <sawan.chandak@cavium.com> Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.