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Prarit Bhargava 81efbaddd6 PCI/MSI: Fix msi_desc->affinity memory leak when freeing MSI IRQs
During device setup, msix_setup_entries() and msi_setup_entry() allocate
msi_desc by calling alloc_msi_entry().  alloc_msi_entry() can also allocate
a affinity cpumask.  During device teardown free_msi_irqs() is called and
the msi_desc is freed, but the affinity cpumask is leaked.

Fix it by calling free_msi_entry() which frees both the msi_desc and the
affinity cpumask.

[bhelgaas: aa48b6f708 ("genirq/MSI: Move alloc_msi_entry() from PCI into
 generic MSI code") moved alloc_msi_entry() from drivers/pci/msi.c to
 kernel/irq/msi.c and added a new corresponding free_msi_entry() interface.

 After aa48b6f708, pci/msi.c used alloc_msi_entry(), but did its own
 kfree() instead of using free_msi_entry().  28f4b04143 ("genirq/msi: Add
 cpumask allocation to alloc_msi_entry") added affinity to both
 alloc_msi_entry() and free_msi_entry(), but pci/msi.c didn't use
 free_msi_entry(), resulting in this leak.]

Fixes: aa48b6f708 ("genirq/MSI: Move alloc_msi_entry() from PCI into generic MSI code")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Myron Stowe <mstowe@redhat.com>
History 2017-02-17 14:32:05 -06:00
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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.