From dd05add7b2b6004c5fa3a1f276f56d8668f86b65 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Sat, 26 Sep 2026 19:20:30 -0300 Subject: netfs: zero the tail of a short DIO/unbuffered read The buffered read collector zero-fills the tail of a short read that stops below the inode's i_size (netfs_clear_unread()), so a read that races an extending write still returns the expected number of bytes. The non-buffered collector path does no such thing: it just records how much was transferred. Add the same zero-fill for the non-buffered case, gated on NETFS_SREQ_CLEAR_TAIL: a subreq's source sets that flag when a short result from it is known to be safe to treat as a hole, as opposed to NETFS_SREQ_HIT_EOF, which means the read genuinely ran off the end of the file and should be reported short as-is. Only CLEAR_TAIL should zero-fill here; a real EOF must stay a real short read. No source currently sets CLEAR_TAIL on an unbuffered/DIO subrequest, so this is inert on its own -- a following change teaches cifs to set it in the one case that needs it. Fixes: e2d46f2ec332 ("netfs: Change the read result collector to only use one work item") Reviewed-by: David Howells Reviewed-by: Namjae Jeon Signed-off-by: Paulo Alcantara Cc: Christian Brauner Cc: Matthew Wilcox Cc: Ronnie Sahlberg Cc: Shyam Prasad N Cc: Tom Talpey Cc: Bharath SM Cc: stable@vger.kernel.org --- drivers/usb/class/Kconfig | 49 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 drivers/usb/class/Kconfig (limited to 'drivers/usb/class/Kconfig') diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig new file mode 100644 index 000000000..d3f5162bd --- /dev/null +++ b/drivers/usb/class/Kconfig @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# USB Class driver configuration +# +comment "USB Device Class drivers" + +config USB_ACM + tristate "USB Modem (CDC ACM) support" + depends on TTY + help + This driver supports USB modems and ISDN adapters which support the + Communication Device Class Abstract Control Model interface. + Please read for details. + + If your modem only reports "Cls=ff(vend.)" in the descriptors in + /sys/kernel/debug/usb/devices, then your modem will not work with this + driver. + + To compile this driver as a module, choose M here: the + module will be called cdc-acm. + +config USB_PRINTER + tristate "USB Printer support" + help + Say Y here if you want to connect a USB printer to your computer's + USB port. + + To compile this driver as a module, choose M here: the + module will be called usblp. + +config USB_WDM + tristate "USB Wireless Device Management support" + help + This driver supports the WMC Device Management functionality + of cell phones compliant to the CDC WMC specification. You can use + AT commands over this device. + + To compile this driver as a module, choose M here: the + module will be called cdc-wdm. + +config USB_TMC + tristate "USB Test and Measurement Class support" + help + Say Y here if you want to connect a USB device that follows + the USB.org specification for USB Test and Measurement devices + to your computer's USB port. + + To compile this driver as a module, choose M here: the + module will be called usbtmc. -- cgit v1.3.1