From 2bd30b8dc75b823dd7bbef9d7bc68e1fd7ecee5c Mon Sep 17 00:00:00 2001 From: Sang-Heon Jeon Date: Mon, 24 Aug 2026 01:18:14 +0900 Subject: coccinelle: alloc_cast: drop removed allocators - pci_alloc_consistent() and pci_zalloc_consistent() were removed by commit 7968778914e5 ("PCI: Remove the deprecated "pci-dma-compat.h" API") - kmem_alloc() was removed by commit f078d4ea8276 ("xfs: convert kmem_alloc() to kmalloc()") - kmem_zalloc() was removed by commit 10634530f7ba ("xfs: convert kmem_zalloc() to kzalloc()") - kmem_zone_alloc() and kmem_zone_zalloc() were removed by commit bae633a4a283 ("xfs: remove xfs_zone_{alloc,zalloc} helpers") So drop them from the rules. No functional change. Signed-off-by: Sang-Heon Jeon Signed-off-by: Julia Lawall --- Documentation/usb/ohci.rst | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/usb/ohci.rst (limited to 'Documentation/usb/ohci.rst') diff --git a/Documentation/usb/ohci.rst b/Documentation/usb/ohci.rst new file mode 100644 index 000000000..bb3c49719 --- /dev/null +++ b/Documentation/usb/ohci.rst @@ -0,0 +1,35 @@ +==== +OHCI +==== + +23-Aug-2002 + +The "ohci-hcd" driver is a USB Host Controller Driver (HCD) that is derived +from the "usb-ohci" driver from the 2.4 kernel series. The "usb-ohci" code +was written primarily by Roman Weissgaerber but with +contributions from many others (read its copyright/licencing header). + +It supports the "Open Host Controller Interface" (OHCI), which standardizes +hardware register protocols used to talk to USB 1.1 host controllers. As +compared to the earlier "Universal Host Controller Interface" (UHCI) from +Intel, it pushes more intelligence into the hardware. USB 1.1 controllers +from vendors other than Intel and VIA generally use OHCI. + +Changes since the 2.4 kernel include + + - improved robustness; bugfixes; and less overhead + - supports the updated and simplified usbcore APIs + - interrupt transfers can be larger, and can be queued + - less code, by using the upper level "hcd" framework + - supports some non-PCI implementations of OHCI + - ... more + +The "ohci-hcd" driver handles all USB 1.1 transfer types. Transfers of all +types can be queued. That was also true in "usb-ohci", except for interrupt +transfers. Previously, using periods of one frame would risk data loss due +to overhead in IRQ processing. When interrupt transfers are queued, those +risks can be minimized by making sure the hardware always has transfers to +work on while the OS is getting around to the relevant IRQ processing. + +- David Brownell + -- cgit v1.3.1