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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ab4b71644a
This reverts commit200e0d99("USB: storage: optimize to match the Huawei USB storage devices and support new switch command" and the followup bugfix commitcd060956("USB: storage: properly handle the endian issues of idProduct"). The commit effectively added a large number of Huawei devices to the deprecated usb-storage mode switching logic. Many of these devices have been in use and supported by the userspace usb_modeswitch utility for years. Forcing the switching inside the kernel causes a number of regressions as a result of ignoring existing onfigurations, and also completely takes away the ability to configure mode switching per device/system/user. Known regressions caused by this: - Some of the devices support multiple modes, using different switching commands. There are existing configurations taking advantage of this. - There is a real use case for disabling mode switching and instead mounting the exposed storage device. This becomes impossible with switching logic inside the usb-storage driver. - At least on device fail as a result of the usb-storage switching command, becoming completely unswitchable. This is possibly a firmware bug, but still a regression because the device work as expected using usb_modeswitch defaults. In-kernel mode switching was deprecated years ago with the development of the more user friendly userspace alternatives. The existing list of devices in usb-storage was only kept to prevent breaking already working systems. The long term plan is to remove the list, not to add to it. Ref: http://permalink.gmane.org/gmane.linux.usb.general/28543 Cc: <fangxiaozhi@huawei.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/* Special Initializers for certain USB Mass Storage devices
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*
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* Current development and maintenance by:
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* (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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*
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* This driver is based on the 'USB Mass Storage Class' document. This
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* describes in detail the protocol used to communicate with such
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* devices. Clearly, the designers had SCSI and ATAPI commands in
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* mind when they created this document. The commands are all very
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* similar to commands in the SCSI-II and ATAPI specifications.
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*
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* It is important to note that in a number of cases this class
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* exhibits class-specific exemptions from the USB specification.
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* Notably the usage of NAK, STALL and ACK differs from the norm, in
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* that they are used to communicate wait, failed and OK on commands.
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*
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* Also, for certain devices, the interrupt endpoint is used to convey
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* status of a command.
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*
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* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
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* information about this driver.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/errno.h>
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#include "usb.h"
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#include "initializers.h"
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#include "debug.h"
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#include "transport.h"
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/* This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target
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* mode */
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int usb_stor_euscsi_init(struct us_data *us)
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{
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int result;
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US_DEBUGP("Attempting to init eUSCSI bridge...\n");
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us->iobuf[0] = 0x1;
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result = usb_stor_control_msg(us, us->send_ctrl_pipe,
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0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR,
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0x01, 0x0, us->iobuf, 0x1, 5000);
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US_DEBUGP("-- result is %d\n", result);
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return 0;
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}
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/* This function is required to activate all four slots on the UCR-61S2B
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* flash reader */
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int usb_stor_ucr61s2b_init(struct us_data *us)
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{
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struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf;
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struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf;
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int res;
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unsigned int partial;
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static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS";
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US_DEBUGP("Sending UCR-61S2B initialization packet...\n");
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bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
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bcb->Tag = 0;
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bcb->DataTransferLength = cpu_to_le32(0);
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bcb->Flags = bcb->Lun = 0;
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bcb->Length = sizeof(init_string) - 1;
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memset(bcb->CDB, 0, sizeof(bcb->CDB));
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memcpy(bcb->CDB, init_string, sizeof(init_string) - 1);
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res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb,
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US_BULK_CB_WRAP_LEN, &partial);
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if (res)
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return -EIO;
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US_DEBUGP("Getting status packet...\n");
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res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
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US_BULK_CS_WRAP_LEN, &partial);
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if (res)
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return -EIO;
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return 0;
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}
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/* This places the HUAWEI E220 devices in multi-port mode */
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int usb_stor_huawei_e220_init(struct us_data *us)
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{
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int result;
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result = usb_stor_control_msg(us, us->send_ctrl_pipe,
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USB_REQ_SET_FEATURE,
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USB_TYPE_STANDARD | USB_RECIP_DEVICE,
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0x01, 0x0, NULL, 0x0, 1000);
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US_DEBUGP("Huawei mode set result is %d\n", result);
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return 0;
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}
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