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Pratham Pratap 0c6023a3f0 usb: dwc3: gadget: Update chain bit correctly when using sg list commit `dad2aff3e8` upstream. If scatter-gather operation is allowed, a large USB request is split into multiple TRBs. For preparing TRBs for sg list, driver iterates over the list and creates TRB for each sg and mark the chain bit to false for the last sg. The current IOMMU driver is clubbing the list of sgs which shares a page boundary into one and giving it to USB driver. With this the number of sgs mapped it not equal to the the number of sgs passed. Because of this USB driver is not marking the chain bit to false since it couldn't iterate to the last sg. This patch addresses this issue by marking the chain bit to false if it is the last mapped sg. At a practical level, this patch resolves USB transfer stalls seen with adb on dwc3 based db845c, pixel3 and other qcom hardware after functionfs gadget added scatter-gather support around v4.20. Credit also to Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com> who implemented a very similar fix to this issue. Cc: Felipe Balbi <balbi@kernel.org> Cc: Yang Fei <fei.yang@intel.com> Cc: Thinh Nguyen <thinhn@synopsys.com> Cc: Tejas Joglekar <tejas.joglekar@synopsys.com> Cc: Andrzej Pietrasiewicz <andrzej.p@collabora.com> Cc: Jack Pham <jackp@codeaurora.org> Cc: Todd Kjos <tkjos@google.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Linux USB List <linux-usb@vger.kernel.org> Cc: stable <stable@vger.kernel.org> #4.20+ Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org> [jstultz: Slight tweak to remove sg_is_last() usage, reworked commit message, minor comment tweak] Signed-off-by: John Stultz <john.stultz@linaro.org> Link: https://lore.kernel.org/r/20200302214443.55783-1-john.stultz@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-03-11 14:14:58 +01:00
arch	x86/xen: Distribute switch variables for initialization	2020-03-11 14:14:55 +01:00
block	block: fix 32 bit overflow in __blkdev_issue_discard()	2020-02-01 09:37:12 +00:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: api - Fix race condition in crypto_spawn_alg	2020-02-11 04:34:05 -08:00
Documentation	netfilter: nf_flowtable: fix documentation	2020-03-05 16:42:23 +01:00
drivers	usb: dwc3: gadget: Update chain bit correctly when using sg list	2020-03-11 14:14:58 +01:00
firmware	Fix built-in early-load Intel microcode alignment	2020-01-23 08:21:29 +01:00
fs	cifs: don't leak -EAGAIN for stat() during reconnect	2020-03-11 14:14:57 +01:00
include	usb: charger: assign specific number for enum value	2020-03-05 16:42:20 +01:00
init	fork: fix some -Wmissing-prototypes warnings	2019-12-05 09:21:04 +01:00
ipc	Revert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()"	2020-02-28 16:38:49 +01:00
kernel	kprobes: Fix optimize_kprobe()/unoptimize_kprobe() cancellation logic	2020-03-11 14:14:47 +01:00
lib	lib/stackdepot.c: fix global out-of-bounds in stack_slabs	2020-02-28 16:38:55 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm, thp: fix defrag setting if newline is not used	2020-03-05 16:42:23 +01:00
net	netfilter: nft_tunnel: no need to call htons() when dumping ports	2020-03-05 16:42:23 +01:00
samples	samples/bpf: Don't try to remove user's homedir on clean	2020-02-11 04:34:05 -08:00
scripts	kbuild: use -S instead of -E for precise cc-option test in Kconfig	2020-02-24 08:34:50 +01:00
security	selinux: ensure we cleanup the internal AVC counters on error in avc_update()	2020-02-24 08:34:43 +01:00
sound	ALSA: hda/realtek - Fix silent output on Gigabyte X570 Aorus Master	2020-03-11 14:14:57 +01:00
tools	selftests: forwarding: use proto icmp for {gretap, ip6gretap}_mac testing	2020-03-11 14:14:51 +01:00
usr	kbuild: clean compressed initramfs image	2019-10-07 18:57:16 +02:00
virt	KVM: Check for a bad hva before dropping into the ghc slow path	2020-03-05 16:42:21 +01:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Update drm/i915 bug filing URL	2020-02-28 16:38:49 +01:00
Makefile	Linux 4.19.108	2020-03-05 16:42:23 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

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.